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 Laser Pointers Ehgemus fan thread, post your photo's of the host he built for you.

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08-09-2015, 12:41 PM #33
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,173 Rep Power: 1058763
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

I've noticed something about a Jetlasers beam expander, you can twist the focus of one of their pointers it is attached to by a large amount and it doesn't seem to affect the infinity focus output of the beam expander much, still trying to understand why.

I've oriented a PCX lens both directions and found I like the beam output more when the round side of the lens is facing out, the flat side towards the laser. Which is your preference?

__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

08-09-2015, 02:45 PM #34
 Class 2 Laser Join Date: Aug 2010 Location: Padova - Italy Posts: 422 Rep Power: 88194
Minamoto Kobayashi
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Hi.
Do You mean to change the focus turning clockwise/counterclockwise the focus mechanism of the laser, so before the focus mechanism of the beam expander?
If so it is normal, it is a phisical optic limitation. I have found the same issue with my many LG modified beam expanders used after G2 or 3 elements glass lenses. I obtain the best input beam slightly defocus the input beam after the first lens.
If the input beam is convergent I obtain a short focus, if it is divergent I obain a long focus. If it is too much focused there is a chance to destroy the lens coating.
Centering procedure apart, the best way that I have found, at least in my LG expanders, to have the best GAP min/max focusing distance is this:
completely twist the LG BE lens until I reach the end of the thread (shortly before the piece from falling), then turn on the laser and look the line shape impressed in the last big lens (NOT LOOK DIRECTLY BUT FROM A SIDE!!): if the line is too short or if the line is too big and exceed the edges of the lens, so there is the need to adj the position of the G2/3 element lens (clockwise or counterclokwise).
The best position is when the output beam line almost reach the borders of the lens on the left and on the right (close to the borders without touch it).
If the line is perfectly centered in the 2 axis (fast and slow), You must obtain the best gap and the max output power available.

Your PCX lens is placed in the worse way, as shown in the photo. Are You sure that You obtain a tiny dot point? What is the shortest focus (near the aperture) that You can obtain in Your build?
__________________
- Sinner Cypreus II 18650 405nm 1000 mW
- Jayrob Aurora Stainless Steel 18650 445nm 891 mW Average 950 mW Peak
- Jayrob Frankenstein 445nm 2875 mW Average 3108 mW Peak With Modified Recoated Laserglow 10x Beam Expander
- Jetlaser PL-E Pro Focusable 445 nm 4000 mW Peak 3500 mW Average With Jetlaser 10x Beam Expander
- Mrcrouse Zaser Black Anodized Custom Head/Pill 445 nm 4970 mW Peak 4670 mW Average With Laserglow Modified Recoated 10x Beam Expander
- Sinner Cypreus IIIb 450nm 4757mW With Three Elements Glass Lenses And Adapted Linos 10x Beam Expander
- Indigo Imperator 6500mW Optically Corrected With Thorlabs 3x Beam Expander
- Sinner Cypreus II XL Gold Plated 24k 465nm 4200 mW Peak With Three Elements Glass Lenses
- CDBEAM Blue Balista 467nm 5088mW Optical Corrected 8 Lenses System
- CDBEAM Verde Volcano 520nm 2600 mW Dual Diode Build With PBS, Corrective Optics, Variable Output Power And 10x Variable Magnification Linos Beam Expander
- Laserglow Hercules 600 532nm 650 mW With Adapted 8x Linos beam expander
- Jayrob Aurora Stainless Steel 18650 532nm 195mW Peak 181 mW Average
- Jayrob Aurora Stainless Steel 18650 635nm 284 mW Peak 271 mW Average
- Sci-Fi Lasers Arcane II 635nm Light Gray Metallic Powder Coated 675 mW Peak 645 mW Average With Three Elements Glass Lenses
- Jayzereer C-Mount Red Mag Build 650nm 1600 mW

- Aurora SH-032 Stainless Steel 160 Lumens
- Nitecore TN36UTvn Modded Ultra-Directive 1 MLux !!
- Fenix TK75vnQ Modded Ultra Flood & Throw 14.000 Lumens
- Fire-Foxes FF4 6000 Lumens

- Laserbee 7 Watt Laser Power Meter Ophir Thermopile

08-09-2015, 06:34 PM #35
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,173 Rep Power: 1058763
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

My near focus is a couple of feet away, I eill turn the lens around and see if i like it more. I didnt know the Jetlasers beam expander could be adjusted itself, i will try it out when i get back home tonight, i'm on the north coast of alaska right now.

08-15-2015, 08:32 PM #36
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Laserbeamk
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

09-12-2015, 03:15 PM #37
 Class 3B Laser Join Date: Dec 2014 Location: N.J. USA ⚡️⚡️ Posts: 3,837 Rep Power: 756589
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Hi great build on your part being your a pilot and in Alaska smart move ingenious better to have and not need than to need and not have i always say. Kudos to you on this build.

Rich

09-13-2015, 04:15 AM #38
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,173 Rep Power: 1058763
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

My Ehgemus hosts waiting for diodes - They are so nice I keep buying them even though I don't have diodes for them yet! I included the one on the far right which is almost finished, it has a red and green single mode in it, still needs a blue single mode diode to finish. I have several more finished and working made to order Ehgemus hosts which are not shown here.

I should have turned them to show the push buttons near the heat sink ends on most of them, oops! Most also have end cap on-off buttons.

Harold has several hosts for sale at these two links:

http://laserpointerforums.com/f39/fs...5-a-93207.html

http://laserpointerforums.com/f39/fs...5-a-94288.html

Why do I keep buying them before I have the diodes to fill them with? His work is one of a kind, unless you have a special order for something he has made in the past, he usually doesn't make the same exact host twice. If you see something you like, better get it while you can if you want it fast. Harold can usually make custom orders fast too, but I think he is getting more and more requests for custom work lately.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 09-13-2015 at 05:54 AM.

11-15-2015, 01:33 AM #39
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,173 Rep Power: 1058763
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Ehgemus made another host for me. I added the chrome tube and cone with lens. Has a NDG7475T 1.4 watt output 520nm green laser diode in it. The output is an uncorrected beam, because of this the beam is a rectangle shape, but I will be adding corrective optics to it later to round out the beam more.

Why the huge lens? With a five inch lens the divergence is so low for 10 miles and greater distance this 1.4 watt output laser can theoretically produce a brighter spot than a 1000 watt 3.6 mRad divergence laser which is the typical divergence for this diode when used with a G2 lens (of course, a 6 mm G2 lens wouldn't survive that much power). At one mile distance the spot should be brighter than a 400 watt laser, at a quarter mile as bright as a 100 watt laser, at 500 feet a 20 watt laser. I'm assuming a best case with the above figures, but even if I am off by 25 percent across the board, due to its low divergence this laser will still produce an awesomely bright spot many miles away making the typical 1.2 to 1.5 mRad laser pointers more like flashlights in comparison.

Strange reality isn't it, that a laser pointer with a big lens like this which looks like a flashlight can do that. I'd like to do this same thing with a 100mw single mode laser diode, using one of those in this host would produce a much brighter spot at distance, although the beam itself less than impressive

Above beam shot photo taken after swapping out the 4 inch lens with a larger cone and 6 inch diameter lens. The lens is larger than the 5 inch diameter aperture, because of this it overhangs the rim. A small amount of rubber cement keeps the lens secure.

This monster takes 2 X 32650 batteries, plenty of capacity

Last edited by Alaskan; 11-17-2015 at 01:55 AM.

11-15-2015, 01:49 AM #40
 Class 2 Laser Join Date: Aug 2010 Location: Padova - Italy Posts: 422 Rep Power: 88194
Minamoto Kobayashi
Class 2 Laser

Join Date: Aug 2010
Posts: 422
Rep Power: 88194
Re: Ehgemus fan thread, post your photo's of the host he built for you.

Very beautiful host!
I suppose that the fat part was created to contain the corrective optics, right?
__________________
- Sinner Cypreus II 18650 405nm 1000 mW
- Jayrob Aurora Stainless Steel 18650 445nm 891 mW Average 950 mW Peak
- Jayrob Frankenstein 445nm 2875 mW Average 3108 mW Peak With Modified Recoated Laserglow 10x Beam Expander
- Jetlaser PL-E Pro Focusable 445 nm 4000 mW Peak 3500 mW Average With Jetlaser 10x Beam Expander
- Mrcrouse Zaser Black Anodized Custom Head/Pill 445 nm 4970 mW Peak 4670 mW Average With Laserglow Modified Recoated 10x Beam Expander
- Sinner Cypreus IIIb 450nm 4757mW With Three Elements Glass Lenses And Adapted Linos 10x Beam Expander
- Indigo Imperator 6500mW Optically Corrected With Thorlabs 3x Beam Expander
- Sinner Cypreus II XL Gold Plated 24k 465nm 4200 mW Peak With Three Elements Glass Lenses
- CDBEAM Blue Balista 467nm 5088mW Optical Corrected 8 Lenses System
- CDBEAM Verde Volcano 520nm 2600 mW Dual Diode Build With PBS, Corrective Optics, Variable Output Power And 10x Variable Magnification Linos Beam Expander
- Laserglow Hercules 600 532nm 650 mW With Adapted 8x Linos beam expander
- Jayrob Aurora Stainless Steel 18650 532nm 195mW Peak 181 mW Average
- Jayrob Aurora Stainless Steel 18650 635nm 284 mW Peak 271 mW Average
- Sci-Fi Lasers Arcane II 635nm Light Gray Metallic Powder Coated 675 mW Peak 645 mW Average With Three Elements Glass Lenses
- Jayzereer C-Mount Red Mag Build 650nm 1600 mW

- Aurora SH-032 Stainless Steel 160 Lumens
- Nitecore TN36UTvn Modded Ultra-Directive 1 MLux !!
- Fenix TK75vnQ Modded Ultra Flood & Throw 14.000 Lumens
- Fire-Foxes FF4 6000 Lumens

- Laserbee 7 Watt Laser Power Meter Ophir Thermopile

11-15-2015, 02:28 AM #41
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,173 Rep Power: 1058763
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Yea, there is plenty of room for the corrective optics, far more than needed. The cylinder lens pair I want to use to correct the beam are small with only a 12mm diameter, but adding a ledge inside to mount them to takes some extra room and then the beam needs to be expanded to match the collimation lens diameter, so all in all it is just easier to have the tube be 3 inches wide. The chrome tube which inserts into the main body of the host slides in and out to focus.

As it is now, the three inch tube is just a empty cylinder which is wide enough to allow the beam to expand to match the diameter of the lens on the end.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 11-15-2015 at 02:33 AM.

12-20-2015, 02:25 AM #42
 Class 2 Laser Join Date: Feb 2013 Posts: 303 Rep Power: 2127
ABarnett
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Ehgemus has made two hosts for me and I just ordered five more. It's awesome someone is making hosts of this caliber and for a good price. Its definitely adding to hobby as a whole. These hosts plus the new diodes available sucked me back into my addiction too lasers.

12-20-2015, 07:17 AM #43
 Class 3R Laser Join Date: Mar 2013 Location: Colorado Posts: 1,715 Rep Power: 34654
Shakenawake
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

had this made recently. really pleased with how it came out, the heat sink is huge, which is good because its a hot diode. I wanted this awesome power but hated the specs. I wished I could use my PL-E pro expander on it. so I sent the adapter to him and he made a focus adapter that will accomodate the BE. I can use it on most of my lasers though the diameter is not going to match up on most. it really helps out the beam and still does nearly 6W with it on, check it out:

__________________
501B BDR-209 16X 405nm 630mW @.52Ag lens
Host by Ehgemus NUBM44 450nm 6.8W @4.5A g lens
Host by Ehgemus M462 462nm 1.5W @1.2A g lens
Dominator NUBM07E 465nm 4.3W @3.5A g lens
L2P Nichi@ NDG4216 515nm 110mW @ .35A
501B by Blord osr@m PL520 520nm 95mW @.3A g lens
PL-E pro from Jetlasers nichi@ NDG7475 520nm 980mW, 730mW w/ 10X BE

Lasermax Genesis sight 532nm 5mW
RPL from Optotronics 532nm 450mW

Spartan from Dragonlasers 589nm 50mW
501B HL63133DG 638nm 210mW @.3A g lens
501B Ocl@ro HL63193MG 638nm 960mW @1.3A g lens

501B by Blord LPC 826 660nm 325mW @?A g lens
PL660 from Laserbtb 660nm 1020mW

LPM
DL matrix and fan transmission gratings

laser powers in sig are about 20 seconds into duty cycle, not peak powers

http://laserpointerforums.com/f39/co...her-94720.html

(I guess I am a vet now)

Last edited by Shakenawake; 05-18-2016 at 05:36 AM.

12-20-2015, 04:55 PM #44
 Class 3R Laser Join Date: Feb 2009 Location: KY. Posts: 1,385 Rep Power: 2649
Ehgemus
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Very nice^^ I just love the way that host turned out.

12-20-2015, 09:56 PM #45
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,173 Rep Power: 1058763
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Very nice, I'm guessing you are using the NUBM44 445nm blue laser diode in it? Beam shots would be awesome if you can post them later I would love to have a host like that, very nicely done.

Here's a knife edge host Ehgemus made for me recently:

This was built to hold up to six knife edged diodes & corrective optics inside. The tube on the end is eight inches long and can slide forward up to 5.5 inches to allow the choice of many different focal length lenses on the output. The output holds a large 3 inch diameter PCX lens to reduce the divergence to a few tenths of an mRad. Harold has always done outstanding work, but he is getting better and better with these projects, the precision of the telescoping tube on it is which slides on the inner tube is wonderful, no slop at all.

The host was made from a Fenix TK75 flashlight body which was the best solution I could find for an easy way to get plenty of run time using this many diodes with four sets of four each series paralled 18650 batteries. The photo shows the tube using two sets of four batteries to produce 8.4 VDC at 14 amp hours of capacity. Additional battery extender tubes can be added to increase the capacity to 28 amp hours and of course, that is a ridiculous amount of capacity, even 14000 mAH is a lot.

I am not finished adding parts to make it play, but I have all of them in hand and expect to conservatively produce 5 watts of output at 520nm/green.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 12-20-2015 at 11:23 PM.

12-20-2015, 10:46 PM #46
 Class 3R Laser Join Date: Mar 2013 Location: Colorado Posts: 1,715 Rep Power: 34654
Shakenawake
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Aye, it is that diode. I figured beam shots would be requested. I am so nervous about pointing this thing in the sky but I can say that without the expander, its a nasty g lens ribbon like the oclaro and mitsubishi 638s. with the expander, it looks like a more traditional beam. it would be even better to correct with the cylindrical pairs then use an expander but I have only the expander now. still, the difference from that alone is very appreciable. the expander adpter actually has smoother action in the threads on ehgemus's adapter than the original PL-E pro

maybe i will try some indoor shots, the divergence is so bad without the expander it's noticable after only a few yards. one problem is the heatsink is so heavy my tripod will not hold it up. shoulda had ehgemus make a heavy pommel for it too, lol.

cant wait to see what you end up with there Alaskan
__________________
501B BDR-209 16X 405nm 630mW @.52Ag lens
Host by Ehgemus NUBM44 450nm 6.8W @4.5A g lens
Host by Ehgemus M462 462nm 1.5W @1.2A g lens
Dominator NUBM07E 465nm 4.3W @3.5A g lens
L2P Nichi@ NDG4216 515nm 110mW @ .35A
501B by Blord osr@m PL520 520nm 95mW @.3A g lens
PL-E pro from Jetlasers nichi@ NDG7475 520nm 980mW, 730mW w/ 10X BE

Lasermax Genesis sight 532nm 5mW
RPL from Optotronics 532nm 450mW

Spartan from Dragonlasers 589nm 50mW
501B HL63133DG 638nm 210mW @.3A g lens
501B Ocl@ro HL63193MG 638nm 960mW @1.3A g lens

501B by Blord LPC 826 660nm 325mW @?A g lens
PL660 from Laserbtb 660nm 1020mW

LPM
DL matrix and fan transmission gratings

laser powers in sig are about 20 seconds into duty cycle, not peak powers

http://laserpointerforums.com/f39/co...her-94720.html

(I guess I am a vet now)

12-20-2015, 11:50 PM #47
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,173 Rep Power: 1058763
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

Just make sure there are no airplanes in the sky, I did it once in Afghanistan on a remote base for just a few seconds and then thought, what the hell am I doing? Showing my location!! Oops... didn't do that twice.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

12-21-2015, 07:07 AM #48
 Class 2M Laser Join Date: Oct 2015 Location: Bangor, Maine Posts: 536 Rep Power: 128103
Ricker
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Re: Ehgemus fan thread, post your photo's of the host he built for you.

I'm drooling guys!!

My New Harold Creation

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