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08-12-2015, 06:36 PM #17
 Class 3B Laser Join Date: Jan 2014 Location: Baghdad, Iraq Posts: 4,244 Rep Power: 2080
Class 3B Laser

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Quote:
 Originally Posted by TaterMay An X-Boost lasted that long at over 8 volts? Mine died almost instantly when the input voltage exceeded the voltage drop of the load by only 1 to 2 volts. That was with only one li-ion. I just accidentally had the jumper one diode too low on my test load.
Well, maybe I ordered the buck driver for it and forgot, don't know, will have to open it to see.

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Laser Safety:
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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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08-12-2015, 07:09 PM #18
 Class 4 Laser Join Date: Jun 2010 Location: St. Louis MO Posts: 5,373 Rep Power: 1566
DTR
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I have done a few with buck driver if you requested it. That is the only way I can see it surviving with two Li-ions in series.

08-12-2015, 07:47 PM #19
 Class 2 Laser Join Date: May 2015 Location: Birmingham, AL Posts: 350 Rep Power: 92
TaterMay
Class 2 Laser

Join Date: May 2015
Location: Birmingham, AL
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Rep Power: 92

Quote:
 Originally Posted by Alaskan Well, maybe I ordered the buck driver for it and forgot, don't know, will have to open it to see.
I think that is most likely the case. Mine didn't even pretend to work with a too-low load voltage. It immediately got stuck at 200mA, and will no longer go any higher.

Quote:
 Originally Posted by DTR I have done a few with buck driver if you requested it. That is the only way I can see it surviving with two Li-ions in series.
DTR, are the X-Boost drivers made by Lazeerer? I'm wondering if he might be able to tell me if I can repair it by replacing a/some components.

Also, what is the safest way to test diodes with a bench power supply? I just got a Mastech HY3006D, and I plan on testing it for the first time tonight with an Oclaro 638nm diode.

Last edited by TaterMay; 08-12-2015 at 07:47 PM.

08-14-2015, 02:28 AM #20
 Junior Member Join Date: Jul 2015 Location: Santiago - Chile Posts: 17 Rep Power: 0
Peche
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Quote:
 Originally Posted by chipdouglas my power supply looks similar to yours OP. I've found that I have troubles using it to power boost drivers. I set voltage to zero, then turn current all the way up then hook up my driver, then slowly ramp up voltage.
I'll be sending the laser to DTR so he can check it but when it comes back I'll try this method, by ramping the voltage I hope to say goodbye to any nasty transient.

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