Old 02-28-2010, 01:10 AM #1
shockwave88's Avatar
Class 1M Laser
 
Join Date: Feb 2010
Location: ON Canada
Posts: 141
Rep Power: 11
shockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura about
shockwave88 shockwave88 is offline
Class 1M Laser
shockwave88's Avatar
 
Join Date: Feb 2010
Location: ON Canada
Posts: 141
Rep Power: 11
shockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura about
Default laser pointed through a telescope?

Hey guys i have a telescope and i was wondering once i get my laser if i shine it through that telescope to an object would it burn the object a couple times more? depending what it is? like for example would it be able to burn a hole in my dry wall? the telescope has like 4 or something mirrors inside it. Could be magnifying glasses but im not sure. Any 1 try this b4? Cause it wud be pretty cool lol

This laser im getting is 200mw FLX green from rayfoss.



Last edited by shockwave88; 02-28-2010 at 01:15 AM.
shockwave88 is offline   Reply With Quote


















Old 02-28-2010, 01:20 AM #2
Class 3B Laser
 
Join Date: Oct 2009
Location: Central New York State - Watkins Glen - planet Earth
Posts: 2,745
Rep Power: 138638
photonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond repute
photonaholic photonaholic is offline
Class 3B Laser
 
Join Date: Oct 2009
Location: Central New York State - Watkins Glen - planet Earth
Posts: 2,745
Rep Power: 138638
photonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond repute
Default Re: laser pointed through a telescope?

no, the optics in a telescope would not focus your laser correctly to burn anything, most likely make a dot the size of a basketball....

shining it in from the front, the focal point is right on top of the eyepiece, shining it the other way, the focal point will be like so far away it won't matter anymore.

If you want to burn a hole in the wall, you need a LOT of power, like a C02 laser puts out.
__________________
Thanks for reading my post.
Kind regards, Wayne

------------------------------------------------------------------
"Disclaimer: all posts made by me are based on my own opinion only,
That opinion is subject to change without notice."


Too much knowledge is dangerous, not enough is worse.
Adapted from Einstein quote.
------------------------------------------------------------------
If you want to burn things, buy a lighter
------------------------------------------------------------------
My Pet Forums - for the animal fans Link
Dances With Reptiles - If you like snakes Link
photonaholic is offline   Reply With Quote
Old 02-28-2010, 01:22 AM #3
scopeguy20's Avatar
Class 3B Laser
 
Join Date: Jun 2007
Location: Sunny S. California WOOT!
Posts: 3,447
Rep Power: 707
scopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond repute
scopeguy20 scopeguy20 is offline
Class 3B Laser
scopeguy20's Avatar
 
Join Date: Jun 2007
Location: Sunny S. California WOOT!
Posts: 3,447
Rep Power: 707
scopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond repute
Default Re: laser pointed through a telescope?

I am not so sure the focus can not be made to be several dozen meters, with racking the eyepiece out some, as this makes the telescope focus at less than 40 yards, but although I have sent my under 90mW laser through the eyepiece to the sky to see the beam and know where the 'scope is pointed. I think the total light loss of typical telescopes is under 5%, but still if losing 5% and then being able to focus the remaining power to a dot typically about 20 times more condensed at a distance of many meters would give you more "burn' at your output power, then, it could well extend your burn distance by about 9.8 times what you had before. Sadly I did not ever try to burn things in this way, as I don't want to pipe my more powerful lasers through my equally treasured telescopes to pop a balloon or light a match. AMB! -Glenn
__________________
Bluray 140 mW, DJR & New FAV! 8X >500 mW Cree! Made by IgorT Flaminpyro BR &
Red Burner on board, need more ~650 nm 140 mW
8 red Hene's 632.8 nm 2-3mW green HeNe & T/Y to rhd 635nm ~400mW
Rigel SOLD! 3-4 mW I Love it PGL III 593.5nm doing >20 mW! SOLD!
Several Green lasers, EVO PRO Peak ~160 mW & Spyder I Peak 295 mW are my new green favorites!
LG Aquarius -10 & Viasho 473 nm peak ~29 mW WL S3 >60 mW peak 112mW SOLD!
Awesome rhd 451nm 2.1 W SOLD! & 445 >2W by DTR! , Yobresal 1.2W Cree & pen 445 w/ star-cap doing 750 mW!! 500mW 445nm Dorcy Jr. Thanks to Flaminpyro!
Awesome Osram 450nm pocket mini from DTR does about 750mW!

Big T/Y! to builders: IgorT, DTR, john lawson, jayrob, IgorT, whatsupadrian, daguin, and all!
Spiro toy mod w/ side aperture for any pointer Spiro toy in Violet Spiro by yobresal too!
Laser sleds/ diodes sold so far 1180+ A few LPC-826 diodes F.S. $12 ea.



Last edited by scopeguy20; 02-28-2010 at 01:26 AM.
scopeguy20 is offline   Reply With Quote
Old 02-28-2010, 01:44 AM #4
shockwave88's Avatar
Class 1M Laser
 
Join Date: Feb 2010
Location: ON Canada
Posts: 141
Rep Power: 11
shockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura about
shockwave88 shockwave88 is offline
Class 1M Laser
shockwave88's Avatar
 
Join Date: Feb 2010
Location: ON Canada
Posts: 141
Rep Power: 11
shockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura about
Default Re: laser pointed through a telescope?

I c. Interesting im going to try this out once i get my laser :P ill tell u guys what the results are
shockwave88 is offline   Reply With Quote
Old 02-28-2010, 02:20 AM #5
KiLLrB's Avatar
Class 3R Laser
 
Join Date: Jan 2010
Location: Lubbock, TX USA
Posts: 1,097
Rep Power: 1357
KiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond repute
Send a message via MSN to KiLLrB Send a message via Yahoo to KiLLrB
KiLLrB KiLLrB is offline
Class 3R Laser
KiLLrB's Avatar
 
Join Date: Jan 2010
Location: Lubbock, TX USA
Posts: 1,097
Rep Power: 1357
KiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond repute
Send a message via MSN to KiLLrB Send a message via Yahoo to KiLLrB
Default Re: laser pointed through a telescope?

Im not sure but if you have a newtonian style you may damage the aluminum coating on the mirrors not sure but i wouldnt try it with a higher powered laser.

I use a <5mW laser collimator all the time to collimate my scopes but when it come out of the aperature it gets bigger .
__________________
3 keychain <5mW red lasers
2 ~5mW HeNe (632.8) See my HeNe Disassembly tut HERE
BluRay Laser Pointer
1W+ 445 by Yobresal LINK
sold* OPTO +150mW Green Laser pointer Review Here

FS: Custom circuits and test loads


Quote:
Originally Posted by nikokapo View Post
"Does this rag smell like chloroform to you?"
KiLLrB is offline   Reply With Quote
Old 02-28-2010, 02:26 AM #6
scopeguy20's Avatar
Class 3B Laser
 
Join Date: Jun 2007
Location: Sunny S. California WOOT!
Posts: 3,447
Rep Power: 707
scopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond repute
scopeguy20 scopeguy20 is offline
Class 3B Laser
scopeguy20's Avatar
 
Join Date: Jun 2007
Location: Sunny S. California WOOT!
Posts: 3,447
Rep Power: 707
scopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond repute
Default Re: laser pointed through a telescope?

I seriously doubt the coatings would be damaged by <500 mW but still, I haven't piped my Spyder I through my Meade 10 in. Schmidt-Newt. -Glenn
__________________
Bluray 140 mW, DJR & New FAV! 8X >500 mW Cree! Made by IgorT Flaminpyro BR &
Red Burner on board, need more ~650 nm 140 mW
8 red Hene's 632.8 nm 2-3mW green HeNe & T/Y to rhd 635nm ~400mW
Rigel SOLD! 3-4 mW I Love it PGL III 593.5nm doing >20 mW! SOLD!
Several Green lasers, EVO PRO Peak ~160 mW & Spyder I Peak 295 mW are my new green favorites!
LG Aquarius -10 & Viasho 473 nm peak ~29 mW WL S3 >60 mW peak 112mW SOLD!
Awesome rhd 451nm 2.1 W SOLD! & 445 >2W by DTR! , Yobresal 1.2W Cree & pen 445 w/ star-cap doing 750 mW!! 500mW 445nm Dorcy Jr. Thanks to Flaminpyro!
Awesome Osram 450nm pocket mini from DTR does about 750mW!

Big T/Y! to builders: IgorT, DTR, john lawson, jayrob, IgorT, whatsupadrian, daguin, and all!
Spiro toy mod w/ side aperture for any pointer Spiro toy in Violet Spiro by yobresal too!
Laser sleds/ diodes sold so far 1180+ A few LPC-826 diodes F.S. $12 ea.


scopeguy20 is offline   Reply With Quote
Old 02-28-2010, 02:31 AM #7
KiLLrB's Avatar
Class 3R Laser
 
Join Date: Jan 2010
Location: Lubbock, TX USA
Posts: 1,097
Rep Power: 1357
KiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond repute
Send a message via MSN to KiLLrB Send a message via Yahoo to KiLLrB
KiLLrB KiLLrB is offline
Class 3R Laser
KiLLrB's Avatar
 
Join Date: Jan 2010
Location: Lubbock, TX USA
Posts: 1,097
Rep Power: 1357
KiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond repute
Send a message via MSN to KiLLrB Send a message via Yahoo to KiLLrB
Default Re: laser pointed through a telescope?

Quote:
Originally Posted by scopeguy20 View Post
I seriously doubt the coatings would be damaged by <500 mW but still, I haven't piped my Spyder I through my Meade 10 in. Schmidt-Newt. -Glenn
would you chance it? the coatings on those scopes especially yours if it has the acf coatings are hella sensative and i know you can burn through aluminum with a >500mW laser. and besides the corrective lens on the frontof yours will prolly be affected dont ya think? I dunno Im super paranoid about my optics on my scopes It prolly wouldnt do any harm since they are made to be super reflective but who knows.
__________________
3 keychain <5mW red lasers
2 ~5mW HeNe (632.8) See my HeNe Disassembly tut HERE
BluRay Laser Pointer
1W+ 445 by Yobresal LINK
sold* OPTO +150mW Green Laser pointer Review Here

FS: Custom circuits and test loads


Quote:
Originally Posted by nikokapo View Post
"Does this rag smell like chloroform to you?"

Last edited by KiLLrB; 02-28-2010 at 02:35 AM.
KiLLrB is offline   Reply With Quote
Old 02-28-2010, 03:01 AM #8
Bowtie41's Avatar
Junior Member
 
Join Date: Feb 2010
Location: Granite City,Illinois,USA
Posts: 11
Rep Power: 0
Bowtie41 is on a distinguished road
Bowtie41 Bowtie41 is offline
Junior Member
Bowtie41's Avatar
 
Join Date: Feb 2010
Location: Granite City,Illinois,USA
Posts: 11
Rep Power: 0
Bowtie41 is on a distinguished road
Default Re: laser pointed through a telescope?

I'd look around on ebay,craigslist,fleamarket,etc,and get the cheapest if not free scope and give it a whirl!
__________________
Oh My God.....I Killed Kenny!!
Bowtie41 is offline   Reply With Quote
Old 02-28-2010, 05:02 AM #9
Greenmechanic's Avatar
Class 3R Laser
 
Join Date: Aug 2009
Location: Lakeland,FL.
Posts: 1,071
Rep Power: 63
Greenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond repute
Greenmechanic Greenmechanic is offline
Class 3R Laser
Greenmechanic's Avatar
 
Join Date: Aug 2009
Location: Lakeland,FL.
Posts: 1,071
Rep Power: 63
Greenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond reputeGreenmechanic has a reputation beyond repute
Default Re: laser pointed through a telescope?

Quote:
Originally Posted by Bowtie41 View Post
I'd look around on ebay,craigslist,fleamarket,etc,and get the cheapest if not free scope and give it a whirl!
The cheapest scope you can get is a world away from a quality telescope.
You would probably get 50% loss (and lots of artifacts) with anything under $200. Just a guess, but I own a cheapie and I can not even see the moon clearly, it's a fuzzball.
__________________
Laser count = {88}
Builds by me = 19
670nm=2
650nm=33
635nm2
532nm=14
445nm=2
405nm=13
Scanners and Other Show Lasers=8
Red & Green He-Ne lasers=15
488nm Argon and other Gas Lasers=1
Laser tools (not included in total)=12
METERS
Kenometer Lite
Metrologic Photometer
Greenmechanic is offline   Reply With Quote
Old 02-28-2010, 05:56 AM #10
KiLLrB's Avatar
Class 3R Laser
 
Join Date: Jan 2010
Location: Lubbock, TX USA
Posts: 1,097
Rep Power: 1357
KiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond repute
Send a message via MSN to KiLLrB Send a message via Yahoo to KiLLrB
KiLLrB KiLLrB is offline
Class 3R Laser
KiLLrB's Avatar
 
Join Date: Jan 2010
Location: Lubbock, TX USA
Posts: 1,097
Rep Power: 1357
KiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond reputeKiLLrB has a reputation beyond repute
Send a message via MSN to KiLLrB Send a message via Yahoo to KiLLrB
Default Re: laser pointed through a telescope?

Quote:
Originally Posted by Greenmechanic View Post
The cheapest scope you can get is a world away from a quality telescope.
You would probably get 50% loss (and lots of artifacts) with anything under $200. Just a guess, but I own a cheapie and I can not even see the moon clearly, it's a fuzzball.
Exactly. But try at least 400 (IMO) for a scope worthy of any self respecting amateur astronomer. But be careful aperature fever is worse than laser addiction lol.
__________________
3 keychain <5mW red lasers
2 ~5mW HeNe (632.8) See my HeNe Disassembly tut HERE
BluRay Laser Pointer
1W+ 445 by Yobresal LINK
sold* OPTO +150mW Green Laser pointer Review Here

FS: Custom circuits and test loads


Quote:
Originally Posted by nikokapo View Post
"Does this rag smell like chloroform to you?"

Last edited by KiLLrB; 02-28-2010 at 05:59 AM.
KiLLrB is offline   Reply With Quote
Old 02-28-2010, 06:30 AM #11
Class 3B Laser
 
Join Date: Oct 2009
Location: Central New York State - Watkins Glen - planet Earth
Posts: 2,745
Rep Power: 138638
photonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond repute
photonaholic photonaholic is offline
Class 3B Laser
 
Join Date: Oct 2009
Location: Central New York State - Watkins Glen - planet Earth
Posts: 2,745
Rep Power: 138638
photonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond reputephotonaholic has a reputation beyond repute
Default Re: laser pointed through a telescope?

that's what I based my post on, I never had a good scope.
__________________
Thanks for reading my post.
Kind regards, Wayne

------------------------------------------------------------------
"Disclaimer: all posts made by me are based on my own opinion only,
That opinion is subject to change without notice."


Too much knowledge is dangerous, not enough is worse.
Adapted from Einstein quote.
------------------------------------------------------------------
If you want to burn things, buy a lighter
------------------------------------------------------------------
My Pet Forums - for the animal fans Link
Dances With Reptiles - If you like snakes Link
photonaholic is offline   Reply With Quote
Old 02-28-2010, 01:27 PM #12
Class 1M Laser
 
Join Date: Jan 2010
Location: France
Posts: 164
Rep Power: 9
BKarim is on a distinguished road
BKarim BKarim is offline
Class 1M Laser
 
Join Date: Jan 2010
Location: France
Posts: 164
Rep Power: 9
BKarim is on a distinguished road
Default Re: laser pointed through a telescope?

no.
telescopes are designed to collect large area of light emitted from source at infinity, not laser beams.
also the focus point is limited by self-diffraction so size of optics doesn't matter.
the best way to focus a laser is to buy a focusable laser
BKarim is offline   Reply With Quote
Old 02-28-2010, 05:02 PM #13
Junior Member
 
Join Date: Dec 2009
Posts: 24
Rep Power: 0
Grokken has a spectacular aura aboutGrokken has a spectacular aura about
Grokken Grokken is offline
Junior Member
 
Join Date: Dec 2009
Posts: 24
Rep Power: 0
Grokken has a spectacular aura aboutGrokken has a spectacular aura about
Default Re: laser pointed through a telescope?

Your laser will be focusable so you can already focus it down to a tiny dot. You don't need any additional optics for burning.
Grokken is offline   Reply With Quote
Old 02-28-2010, 05:25 PM #14
scopeguy20's Avatar
Class 3B Laser
 
Join Date: Jun 2007
Location: Sunny S. California WOOT!
Posts: 3,447
Rep Power: 707
scopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond repute
scopeguy20 scopeguy20 is offline
Class 3B Laser
scopeguy20's Avatar
 
Join Date: Jun 2007
Location: Sunny S. California WOOT!
Posts: 3,447
Rep Power: 707
scopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond reputescopeguy20 has a reputation beyond repute
Default Re: laser pointed through a telescope?

I do want people to use caution, but it is also true that a beginner can make a laser beam expander and effectively do longer range burning and such with one. Also the laser beam expander is nearly the same optical set up as the early Galilean telescope, the main deference's are that the lenses should be very good quality or even "laser grade" and the coatings on the lenses would best be optimum for your laser wavelength. However even a small telescope or binocular, although not as good, can be used to get a smaller dot at a greater distance and in essence is then being used as a "laser beam expander" surplusshed.com sells lots of "laser grade achromatic lenses" at really low cost. I would advise a negative short fl input lens, maybe well less than -60 mm fl and a output lens of about 40+ mm dia. and about 85 - 135 mm fl to keep the assembly reasonably compact. AMB! -Glenn
__________________
Bluray 140 mW, DJR & New FAV! 8X >500 mW Cree! Made by IgorT Flaminpyro BR &
Red Burner on board, need more ~650 nm 140 mW
8 red Hene's 632.8 nm 2-3mW green HeNe & T/Y to rhd 635nm ~400mW
Rigel SOLD! 3-4 mW I Love it PGL III 593.5nm doing >20 mW! SOLD!
Several Green lasers, EVO PRO Peak ~160 mW & Spyder I Peak 295 mW are my new green favorites!
LG Aquarius -10 & Viasho 473 nm peak ~29 mW WL S3 >60 mW peak 112mW SOLD!
Awesome rhd 451nm 2.1 W SOLD! & 445 >2W by DTR! , Yobresal 1.2W Cree & pen 445 w/ star-cap doing 750 mW!! 500mW 445nm Dorcy Jr. Thanks to Flaminpyro!
Awesome Osram 450nm pocket mini from DTR does about 750mW!

Big T/Y! to builders: IgorT, DTR, john lawson, jayrob, IgorT, whatsupadrian, daguin, and all!
Spiro toy mod w/ side aperture for any pointer Spiro toy in Violet Spiro by yobresal too!
Laser sleds/ diodes sold so far 1180+ A few LPC-826 diodes F.S. $12 ea.


scopeguy20 is offline   Reply With Quote
Old 02-28-2010, 05:42 PM #15
shockwave88's Avatar
Class 1M Laser
 
Join Date: Feb 2010
Location: ON Canada
Posts: 141
Rep Power: 11
shockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura about
shockwave88 shockwave88 is offline
Class 1M Laser
shockwave88's Avatar
 
Join Date: Feb 2010
Location: ON Canada
Posts: 141
Rep Power: 11
shockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura aboutshockwave88 has a spectacular aura about
Default Re: laser pointed through a telescope?

ic interestin stuff.
shockwave88 is offline   Reply With Quote
Old 02-28-2010, 05:51 PM #16
Bowtie41's Avatar
Junior Member
 
Join Date: Feb 2010
Location: Granite City,Illinois,USA
Posts: 11
Rep Power: 0
Bowtie41 is on a distinguished road
Bowtie41 Bowtie41 is offline
Junior Member
Bowtie41's Avatar
 
Join Date: Feb 2010
Location: Granite City,Illinois,USA
Posts: 11
Rep Power: 0
Bowtie41 is on a distinguished road
Default Re: laser pointed through a telescope?

Quote:
Originally Posted by BobH View Post
A couple hundred mW of any color laser beam isn't going to do anything to any telescope mirror or lens coating. If you hit a piece of black plastic inside the tube of a cheap telescope, like a baffle or cheap mounting part, you might burn a hole in that and get plastic smoke on the coatings. Wouldn't want that! Same with the black painted inside of the (possibly) cardboard tube. Send a beam into the eyepiece end of a telescope and you'll see the beam come out as a beam, if it's not stopped by a central obstruction, regardless of the presence of an eyepiece.

You obviously need to be very careful with your lasers. Without knowledge about the simplest optics (telescopes), you're in high danger of getting the beam into your eye or somebody else's. You are a prime example of why lasers will eventually be licensed. A laser "pointer" is only a few mW in power. Enough to point things out but not enough to cause damage. A laser that's higher in power than that but still small enough to be hand held is not a "laser pointer". It's a directed energy weapon. You play with fire, you WILL get burned. Or worse, burn somebody else.
I definately didn't want anyone to get hurt,just give options for where to find one.I have one of those free telescopes that came from Marlboro a few years back(Now I know why they were free,blurry as heck,at least mine was)That I may just take apart to change the focal length to see what happens.Caution and goggles should of course be used if your gonna pump up the power/intensity,but like when I was a kid with mag. glass burning bugs,learn by trying.A friend I used to work with's Dad worked years ago at McDonnell-Douglas working with lasers.The first time they pulsed a laser was by mistake and blew out a cinder block wall,but they learned by trial/error.
I'm new here.I hope I don't offend anyone with this reply.
__________________
Oh My God.....I Killed Kenny!!
Bowtie41 is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 10:12 AM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC