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11-09-2014, 09:58 PM #33
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,272 Rep Power: 2124
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Re: Why do we like lasers?

Because lasers can give the illusion of being able to see light from the side, as a beam, otherwise invisible. A lovely illusion it is.

Take your 1 watt green laser pointer for a space walk and see the beam then, you won't! Humm..... ideas coming; shoot a laser beam through a vacuum chamber with no air in it and take a photo of the in and out... ought to be interesting except the glass vessel will be lit up. Put a evacuated glass cylinder on the end of your laser pointer with optical ends, machine it into the laser, ought to make a cool looking device as the cylinder glows green and out pops a laser beam from the end from seeming nowhere.

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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

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Last edited by Alaskan; 11-10-2014 at 12:26 AM.

11-10-2014, 08:59 PM #34
 Junior Member Join Date: Nov 2014 Location: New York USA (Near NYC) Posts: 10 Rep Power: 0
Agent Provocateur
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Re: Why do we like lasers?

Most of my family and friends have no interest in my lasers. The only thing they ever say is "they are very dangerous", or "you'll get in trouble", or, "isn't it illegal ? "... I became fascinated by lasers back when I learned about them in high school back in the early 1970's. In those days lasers and laser hobbyists were very uncommon, there was no public internet, information was hard to come by, and there were no inexpensive solid state lasers as there are today. I read all the books I could find and I decided I wanted to build a ruby laser but I had no idea where to get a ruby laser rod and for a 14 year old the cost would have been prohibitive. Around 1977 me and a friend built (assembled) a 0.5 mW HeNe laser. These day's a person coming into the laser hobby is so much more fortunate than I was. Not only is there an abundance of laser devices available but there is so much more information available and it is so much easier for people who share this interest to find one another. Thanks largely to the Internet.

Last edited by Agent Provocateur; 11-10-2014 at 09:02 PM.

11-10-2014, 11:58 PM #35
 Class 2M Laser Join Date: Dec 2013 Location: Oklahoma Posts: 630 Rep Power: 148
IWIRE
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Quote:
 Originally Posted by Laser Project Put a evacuated glass cylinder on the end of your laser pointer with optical ends, machine it into the laser, ought to make a cool looking device as the cylinder glows green and out pops a laser beam from the end from seeming nowhere.
Thanks for the idea. I'm not going to use a glass cylinder under vacuum. A build I'm working on has a short barrel the beam exits. I was going to use aluminum and anodize it black. Think I'll try acrylic.
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and there was,
and it was good.
So we amplified it.

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