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06-25-2015, 07:23 PM #33
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,252 Rep Power: 2090
Class 3B Laser

Join Date: Jan 2014
Location: Near Mosul, Iraq
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Re: 2.5 Watt 532nm Laser for 400 dollars, what do you think?

No wonder it took so long to develop lasers, the magic disappears as soon as you try to look at it without having everything just perfect.

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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

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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06-25-2015, 07:44 PM #34
 Class 4 Laser Join Date: Feb 2008 Location: Yellowknife, NT, Canada Posts: 5,934 Rep Power: 1876
diachi
Class 4 Laser

Join Date: Feb 2008
Posts: 5,934
Rep Power: 1876
Re: 2.5 Watt 532nm Laser for 400 dollars, what do you think?

Quote:
 Originally Posted by Alaskan No wonder it took so long to develop lasers, the magic disappears as soon as you try to look at it without having everything just perfect.

Haha yes, looks like Ionlaser filled in the gaps!

As he said, you need *all* of the mirrors to get lasing action at 1064nm. For the sake of simplifying if you're having a hard time understanding how this system functions you can ignore HR2 and HR3 and treat the whole thing as an L-Fold resonator like the one on the diagram below. The OC takes the place of HR2 and you ignore HR3 completely.

The OC is HR@1064 and AR/HT@532 (HT = High Transmission) so without the OC all of your 1064nm light "spills out" of the end meaning you never achieve population inversion and the 1064nm line never lases. Same as when you stick the sensor for your LPM inside the cavity, but the 1064nm is absorbed instead of "spilling out" of the cavity in that case.

Some reading up on resonator design and function in academic papers or on the Laser FAQ may be a great help in aiding your understanding of how this all works.

If you'd like a better explanation I'll see if I can come up with something!
__________________

488nm - Spectra Physics 163 Argon 30mW
532nm - Gearbest 303 Pointer 90mW
~650nm - Sanwu Laser Pocket Series - 250mW
808nm - Melles Griot 532nm Lab Unit - No Crystals >10W

Last edited by diachi; 06-25-2015 at 07:57 PM.

06-27-2015, 07:30 AM #35
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,252 Rep Power: 2090
Class 3B Laser

Join Date: Jan 2014
Location: Near Mosul, Iraq
Posts: 4,252
Rep Power: 2090
Re: 2.5 Watt 532nm Laser for 400 dollars, what do you think?

Thank you for your kind help, I needed the alignment

I'm googling Die4Chill, finding some information, even the makers web site but he doesn't seem to list them there anymore. Ebay seller Tomorrowssystems sells a 40 dollar (shipping from Poland 9 USD more to Alaska) 8 amp TEC controller you can option for either heat or cold I'm looking at.

Sale Last 3 Pcs Tec Controller for Laser Diode Peltier Driver Max 8A | eBay
__________________

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

_______

06-28-2015, 06:28 AM #36
 Class 4 Laser Join Date: Feb 2008 Location: Yellowknife, NT, Canada Posts: 5,934 Rep Power: 1876
diachi
Class 4 Laser

Join Date: Feb 2008
Posts: 5,934
Rep Power: 1876
Re: 2.5 Watt 532nm Laser for 400 dollars, what do you think?

Quote:
 Originally Posted by Alaskan Thank you for your kind help, I needed the alignment I'm googling Die4Chill, finding some information, even the makers web site but he doesn't seem to list them there anymore. Ebay seller Tomorrowssystems sells a 40 dollar (shipping from Poland 9 USD more to Alaska) 8 amp TEC controller you can option for either heat or cold I'm looking at. Sale Last 3 Pcs Tec Controller for Laser Diode Peltier Driver Max 8A | eBay
Actually, you should be able to use a cheap PWM temperature controller with a FET to drive the TEC. I imagine you will be able to find a schematic online for one easily. I did have a schematic a few years back but its long gone now. You should be able to build something with reasonable accuracy too.

Or get one of those all in one temperature controllers with the LCD display! Those look nice!
__________________

488nm - Spectra Physics 163 Argon 30mW
532nm - Gearbest 303 Pointer 90mW
~650nm - Sanwu Laser Pocket Series - 250mW
808nm - Melles Griot 532nm Lab Unit - No Crystals >10W

06-29-2015, 12:28 AM #37
 Class 4 Laser Join Date: Aug 2008 Location: Green Ridge,MO USA Posts: 6,929 Rep Power: 467
Mohrenberg
Class 4 Laser

Join Date: Aug 2008
Location: Green Ridge,MO USA
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Rep Power: 467
Re: 2.5 Watt 532nm Laser for 400 dollars, what do you think?

I remember when 532 was like \$1/mW.
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