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10-12-2014, 04:03 AM #1
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,272 Rep Power: 2124
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175mw Laserglow into 900mm FL Telescope

Found a 900 mm focal length 60mm telescope on ebay for 20 bucks and taped my Laserglow Aries 175mw 532nm laser to it, now that's a fat beam

__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

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Last edited by Alaskan; 10-12-2014 at 04:04 AM.

10-12-2014, 04:17 AM #2
 Class 2M Laser Join Date: Jul 2013 Location: San Francisco Posts: 626 Rep Power: 90
upaa27
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Re: 175mw Laserglow into 900mm FL Telescope

Haha that is pretty cool! Always wondered what such a fat beam would look like.

10-12-2014, 04:19 AM #3
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,272 Rep Power: 2124
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Re: 175mw Laserglow into 900mm FL Telescope

Wish it were a clear night and not cloudy and drizzle raining, as it is now. I took the photo with a cheap cell phone. I will try again when clear outside and post new photo's with a better camera some other time.
__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

10-12-2014, 03:37 PM #4
 Class 2 Laser Join Date: Mar 2013 Location: Berlin ; Germany Posts: 315 Rep Power: 46
shokkunlasers
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Re: 175mw Laserglow into 900mm FL Telescope

Looks awesome!
I Love fat beams in addition to the fact that with expanding comes low divergence
Do that with a 1W green and people will think that you're building a deathstar laser^^

10-12-2014, 04:43 PM #5
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,272 Rep Power: 2124
Class 3B Laser

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Location: Near Mosul, Iraq
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Re: 175mw Laserglow into 900mm FL Telescope

With such a fat beam and the low clouds above, when shooting at a low angle I am fairly sure someone on the far side of the spot a couple of more miles beyond it might not be able to see the beam, just a green orb moving around in the clouds, aliens are coming

Here's what I bought, I didn't realize the seller had more until I went back and looked just now. They do not come with an eye piece:

Celestron 60mm Refractor Telescope OTA 1 25" Focuser 900mm F L | eBay

Without an eye-piece lens I used two large 35mm diameter plano-concave lenses with identical negative focal lengths of -53mm to expand the laser beam before collimation. I happened to have a few of them from an ebay purchase, one alone would not expand the laser beam enough to fill close to the entire lens on the end of the telescope.

So what happens when you put two -53mm focal length plano-concave lenses together? Now 26.5mm focal length? I'm new to optics, don't know but if that is how it works, my beam was expanded by a ratio of over 30 times. If true, my 1.2 mRad laser became a .04 mRad. A laser with that low of a divergence would produce a spot just over 2 feet wide 10 miles away, now that's delivering a lot of light for the distance to one spot. At 1000 miles away, about 200 feet diameter, amazing. Imagine how bright that would be to a theoretical observer, could it challenge the light coming from a small city?

__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

Last edited by Alaskan; 10-12-2014 at 08:55 PM.

10-12-2014, 05:17 PM #6
 Class 4 Laser Join Date: Aug 2010 Location: Austin, TX Posts: 5,904 Rep Power: 575
IsaacT
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Re: 175mw Laserglow into 900mm FL Telescope

Anyone in the USA should check out Craigslist for cheap telescopes. There are always super cheap ones. And make sure you get a refractor not a reflector. A reflector would make the laser into a tube of light if you had the right FL eyepiece.
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10-12-2014, 08:28 PM #7
 Class 3R Laser Join Date: Sep 2013 Location: Washington State Posts: 2,445 Rep Power: 1464
paul1598419
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Re: 175mw Laserglow into 900mm FL Telescope

Nice job. I was wondering how that might look as well. Unfortunately, I won't be doing it myself anytime soon as I made a huge purchase and my funds are now depleted for the time being. But, still, what a nice job, and the divergence is incredible.
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405nm Laser Pointer 45mW
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405nm Laser Shack Pointer 80mW
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

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488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
532nm 200mW thermostatically Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PSU New
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
Ocean Optics USB2000 Spectrometer
Scientech Vector S310 with AC2500 10 Watt LPM
LaserBee II 3.2 Watt LPM
Eisco Scientific Spectroscope 400nm- 700nm

10-12-2014, 09:12 PM #8
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,272 Rep Power: 2124
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Re: 175mw Laserglow into 900mm FL Telescope

Now you have me wondering what kind of goodies you bought

I have another lens I'd like to set up for use as a beam expander someday, I've posted a photo of it here before, about 12 inches diameter. With that lens and the right expander lens the beam can travel a long way before expanding much, at ten miles the spot would be only 5 percent bigger than the lens diameter, at one hundred miles just 50 percent bigger at only a foot and a half wide, at the distance of the moon only 1200 some feet wide. These figures amaze me.

I have a 3 watt output 532nm laser which would go great with this lens IF I ever get it interfaced to a TEC controller! I bought it but haven't wired it all up yet. That one isn't the Halfnote, another one.

PS: the fact that no one can see it 100 miles away because it would be pointing into space is moot to me, it's the reality that impresses me, whether viewed or not, I would know it can go that far while maintaining a tight divergence. A lot more fun would be to point it into a cloud layer to see a brilliant spot in the sky, but not a good idea if an airplane were in the vicinity
__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

Last edited by Alaskan; 10-12-2014 at 09:31 PM.

10-12-2014, 09:37 PM #9
 Class 3R Laser Join Date: Sep 2013 Location: Washington State Posts: 2,445 Rep Power: 1464
paul1598419
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Re: 175mw Laserglow into 900mm FL Telescope

My purchase was unrelated to lasers, so not worth going into here. I looked over your lens, prism set up and the figures for the beam expansion, and I can find no fault with it. I, too, would like to get a laser system with a vey low divergence not unlike what you have planned here, That DPSSL at 3 watts would be perfect to start out and with the wavelength being so high in the visual acuity, would probably give you a beam that would leave a spot at ten miles out that one could see. Have you ever thought of doing it in the summer and from a mountain top at night where you could have one person observing and the other lining the beam up with a telescope to aid you in this endeavor? Nice job, BTW.
__________________
405nm Laser Pointer 45mW
405nm C11 700mW
405nm Laser Shack Pointer 80mW
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
532nm 200mW thermostatically Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PSU New
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
Ocean Optics USB2000 Spectrometer
Scientech Vector S310 with AC2500 10 Watt LPM
LaserBee II 3.2 Watt LPM
Eisco Scientific Spectroscope 400nm- 700nm

10-12-2014, 09:58 PM #10
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,272 Rep Power: 2124
Class 3B Laser

Join Date: Jan 2014
Location: Near Mosul, Iraq
Posts: 4,272
Rep Power: 2124
Re: 175mw Laserglow into 900mm FL Telescope

I originally bought the 12 inch lens surplus for use at IR to do just that, but to modulate the signal to pass data between the two using a telescope just that way. I have too many such projects I've bought parts for and not put anything together yet. The only big project I have finished is this one, it started out with lofty plans to use as a IR beacon for a work related project, but turned into a toy instead, added 800 watts of RGB LED's to it too, they are sure cool, but the divergence is horrible, as you can imagine.

__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

Last edited by Alaskan; 10-12-2014 at 10:00 PM.

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