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GREEN LASER POINTER

Green Laser Pointer, retail $49.95 (www.mr-laser.com...)
Manufactured by Optical Laser & LED Pro. (www.mr-laser.com)
Last updated 11-19-12

(In reference to the padded envelope I received from an Ebay seller at 1:37pm PST on 03-17-06):
{sung like the Foreigner song "Feels Like the First Time"}
Feels like a flaaaaaash-liiiight...feels like a FL

BREAK IN 50276
READY.
CONT

?OUT OF DATA ERROR IN 65535
READY.

Let's try that again...as soon as I saw the address on the package, I *knew* it wasn't a flashlight...

Feels like a laaaaaa-sssser...feels like a LAAAAA-aaaaa-ssser!!!
Feels like a laaaaaa-sssser...feels like a LAAAAA-aaaaa-ssser!!!

This is a green DPSS (diode pumped solid state) laser pointer. It comes in a handsome brushed aluminum case, and includes the two AAA cells it feeds from.

According to the packaging, this is the model GL-1-EX.

SIZE

Feed the laser pointer the included batteries (see below), and then you'll be ready to rock.

To use the laser pointer, just aim it at something you wish to point out, and press & hold down the button on the barrel for as long as you need the laser spot. Release the button to turn the laser pointer back off. Yes, it really is as easy as that.

To change the batteries in this laser, unscrew the unit (the seam is at the halfway point), and set the black portion aside.

Tip the used AAA cells out of the barrel and into your hand, and dispose of, recycle, or recharge them as you see fit. Do not under any circumstances flush them down a toilet or throw them into a trout-filled stream.

Insert two new AAA cells into the barrel, button-end (+) positive first. This is the opposite of how batteries are installed in most flashlights, so please pay attention to polarity here.

Screw the black portion back on, and be done with it.

Unable to measure current draw due to how the product was constructed.

This is a laser pointer, not a flashlight. So I won't throw it against the wall, stomp on it, try to drown it in the toilet bowl, run over it, swing it against the corner of a concrete stair, or inflict upon it punishments that flashlights may have inflicted upon them. So this section of the laser's web page will seem a bit more bare than this section of the web page on a page about a flashlight.

Green diode lasers are a lot different than those common red lasers you see all the time.

In a 640nm red laser pointer, there's a red-emitting diode and a lens to collimate (focus) the beam.

In a 532nm green laser (pointer or larger size), there's a BIG infrared laser diode that generates laser light at 808nm, this is fired into a crystal containing the rare-earth element "neodymium". This crystal takes the 808nm infrared light and lases at 1064nm (yes, deeper in the infrared!). This 1064nm laser light comes out of the NdYV04 (neodymium yttrium vanadium oxide) crystal and is then shot into a second crystal (containing potassium, titanium, & phosphorus, usually called KTP) that doubles the frequency to 532nm - the bright green color you see. This light is then collimated (focused) by a lens and emerges out the laser's "business end". Just before the lens, there's a filter that removes any stray IR (infrared) rays from the pump diode and the neodymium crystal. You don't want that stuff in your green beam, trust me. :-)

This is why green diode lasers are so much more expensive than red ones. Lots of itty bitty parts, and they all need to be aligned by hand. If the polarisation is "off", one or both crystals need to be turned. With red diode lasers, you just slap in the diode and slap a lens in front of it.

This laser is lightly splatter-resistant, but it is not water-resistant, so please be extra careful when using it around sinks, tubs, toilets, fishtanks, pet water bowls, or other places where water or water-like liquids might be found. And you'll probably want to cover it up or otherwise get rid of it (such as by putting it in a pocket or bag) if you need to carry it in rainy or snowy weather.

The labelling on this laser is accurate: it states that it is a Class IIIA instrument, outputting less than 5mW of laser radiation at a wavelength of 532nm, and it actually measures 2.70mW at 532nm.

Power output analysis

Power output measures 3mW on a LaserBee 2.5W USB Laser Power Meter w/Thermopile.

Beam photograph on the test target at 12".
Beam image bloomed *SUBSTANTIALLY*; beam spot is also not white.
Power measures 2.70mW on a laser power meter designed for that purpose.

Spectrographic analysis of this laser.

Spectrographic analysis of this laser; newest spectrometer software & settings used.

Same as above; spectrometer's response narrowed to a range between 528nm to 536nm to pinpoint wavelength, which is 532.001nm.

USB2000 spectrometer graciously donated by P.L.

Beam photograph at ~15'.
Beam spot is not white like this photograph makes it appear.
Beam spot is also somewhat smaller than it appears;
the beam image also bloomed when photographed.

Those rectangular graphic things near the center are marquees from:
Gremlin/Sega ''Astro Blaster''
Venture Line ''Looping''
Sega ''Hang-On''
Williams ''Stargate''
Sega ''Star Trek''
Nintendo ''R-Type''
upright coin-op arcade video games from the early-1980s.

And that red star thing is from an American DJ Laser Widow.

ProMetric analysis

Beam cross-sectional analysis.

Image made using the ProMetric System by Radiant Imaging.

TEST NOTES:
Test unit was purchased on Ebay and was received on the afternoon of 03-17-06.

UPDATE: 06-17-07
I have given this laser to my father as a Father's Day gift; therefore, I no longer have it at my disposal for comparisons or aditional analyses. Therefore, it will receive that dreadful "

" icon next to its listing on this website.

PROS:
Feels good in the hand; is also rather hefty.
No beam artifacts - none that I've been able to detect anyway.

NEUTRAL:
Power is a bit on the low side (3mW); but not unreasonably so -- would make this laser an excellent cat toy!

CONS:
Not waterproof or submersible - but most pointers/pointers aren't. Will not figure into my rating.
More delicate than directly-injected diode laser pointers/modules.

Unknown

Handheld laser

DPSS laser diode

Very narrow spot

Momentary pushbutton on/off on barrel

Possibly a brass/aluminum alloy

Metal; LED aperture recessed in a cell for it

2xAAA cells

Unknown/unable to measure

Splatter-resistant at maximum

NO WAY HOZAY!!!

Batteries, metal presentation case

~162mm L x 12mm Dia.

94.6g (3.340 oz) incl. batteries

Unknown

Unknown/not stated

Green Laser Pointer * www.mr-laser.com...

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