Old 11-14-2017, 04:56 PM #1
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Default Hello

Hello from Italy!
I like astronomy so I need some advice to buy a green laser!


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Old 11-14-2017, 05:00 PM #2
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Default Re: Hello

Don't do it, lasers are an addictive hobby!

If you are new to lasers read up on laser safety, maybe just buy a cheap eight dollar 532nm laser pointer from ebay. You should have safety glasses or goggles, even if they say under 5 mw on ebay, they don't tell the truth, usually 50+ mw.
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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; 11-14-2017 at 05:02 PM.
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Old 11-14-2017, 05:32 PM #3
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Default Re: Hello

Buy an $8 laser on eBay as mentioned above.
If you want better than toy quality or more powerful look at JetLasers here: https://www.jetlasers.org/
Perhaps a PL-E Mini model
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Old 11-14-2017, 05:39 PM #4
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Default Re: Hello

These are plenty bright enough to point at stars

https://www.ebay.com/itm/10-Mile-Mil...s/222425144646
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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
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Old 11-15-2017, 04:10 AM #5
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Default Re: Hello

Yeah, that or a 301 or 303 from eBay is plenty bright enough for astronomy. They are all around $8 and at night the beam is very visible. For an extra $2 you can even get a cheap 18650 battery with charger.
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Old 11-15-2017, 05:59 AM #6
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Ciao
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Old 11-15-2017, 09:56 AM #7
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Default Re: Hello

Welcome!

-Alex
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Old 11-15-2017, 05:30 PM #8
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Default Re: Hello

Welcome to the Forum...

It would be helpful to the members if
you included your Global location in
your Profile...

Enjoy your stay...
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