[Laser] 5 mW lasers & LEDs

[Chuck Hast]

Good seeing some activity on here again. I used to live in Tampa,
now I am in Kalama, WA. I am using lasers in my work, (glass
defect detection, light it up bright enough and you WILL see it)
and also would like to try to get back to the FSO part of things.
Fun working with lasers and getting paid but also fun doing stuff
you enjoy just for the additional fun and learning.

Most of the lasers I use are either green or red, (wine bottle glass
we use three dominant wave lengths, 562-568, 574-578, and 577
to 582 nm. We also have another bottle that is in the 593 nm range.

At this time I work a lot with the green 532 nm lasers, and if the
glass is quite amber, then the 635nm diode lasers. I am looking
at a amber laser either at 578 or 593nm, since we only make glass
in the range from a brown beer bottle to the darker green wine
bottles that is where I do a lot of my work at.

Would like to get back into laser coms as there are actually pieces
of topography around here from which to work. Florida was not
that good unless you could get on top of a high building somewhere.



On Thu, Oct 31, 2013 at 4:48 PM, Steve J. Noll <sjnoll at ix.netcom.com> wrote:

> Been looking at inexpensive lasers & narrow beam LEDs to meet 5 mW ARRL
> contest limit.
>
> eBay "Copper Lasers"
> 660nm wavelength.Most measure 5 mW output, a few percent 6 mW, and a few 1
> to 4 mW. Some sold as 3V, some 4.5V, and some 5V, but seller says 4.5V and
> 5V are really the same. The all appear to want about 21 mA, give or take a
> milliamp, to give 5 mW output and it's probably best to adjust the supply
> voltage to result in that amount of current. The wire colors are not
> consistent lot to lot, i.e.: some 3V lasers have red and yellow leads, some
> red and blue. Lens housing can be rotated to adjust the beam quality which
> is pretty good especially considering they sell for about $18 for 70, or 26
> cents each!. Construction appears to be simply a laser die and a series
> resistor. There is no ESD protection, no optical feedback power control,
> etc. Measured 7 to 10 nS rise (35 MHz BW) .
>
> Vishay TLCR5800 622 nm 8-degree beamwidth LED, measured 60 nS rise, 30 nS
> fall. 3 mW @ 20 mA, 5 mW @ 38 mA. Projects pattern with dark spot in
> center. About 15 cents.
>
> Optek OVLGS0C8B9 623 nm 8-degree beamwidth LED, measured 30 nS rise 20 nS
> fall. 3 mW @ 20 mA, 5 mW @ 37 mA. Projects pattern with dark spot in
> center. About 20 cents.
>
> Avago HLMP-EG08-Y2000 635 nm 8-degree beamwidth, 23 nS rise & fall. 1.5 mW
> @ 20 mA, 5 mW @ 100 mA. Good pattern, no dark spot in center. About 50
> cents.
>
> Rise/Falls measured with a First Sensor PS0.25-5-TO52-SI photodiode (0.4
> nS rise) at -32V bias, Tek TDS524A 500 MHz oscilloscope, HP 8004A pulse
> generator (< 1.5 nS.) Powers measured with a calibrated 1 cm photodiode.
>
> 73,
>
> *Steve J. Noll, WA6EJO
> http://www.qrz.com/db/WA6EJO
> http://www.linkedin.com/in/**stevejnoll<http://www.linkedin.com/in/stevejnoll>
> *
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-- 

Chuck Hast  -- KP4DJT --
Glass, five thousand years of history and getting better.
The only container material that the USDA gives blanket approval on.