5mW 532nm Green Beam Laser Module Pen (2), retail $9.99*
Manufactured by (unknown)
Last updated 02-19-11

(In reference to the small box I received from a website fan at 4:44pm PST on 02-18-11):
{sung like the Foreigner song "Feels Like the First Time"}

This is a green DPSS (diode pumped solid state) laser module that is designed to output 5mW (but actually outputs just over 6.8mW). It is made primarily from brass, covered with what I believe is a black baked enamel finish.

* The sender said that this is the amount he paid for it on Ebay in early-2011.


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

To use the laser module, just aim it at something you wish to point out, and press & hold the button on the barrel. Release the button to turn the laser module back off.

To change the batteries in this laser, unscrew the unit (the seam is at the halfway point), and set the front 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. Please do not under any circumstances flush them down a toliet or throw them into a salmon-filled stream or those tree-huggers might beat the living tweedle out of you.

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 front portion back on, and be done with it.

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

This is a laser module, not a flashlight meant to be carried around, thrashed, trashed, and abused, so I won't try to drown it in the toilet tank, bash it against a steel rod or against the concrete floor of a patio, let my housemate's citty kats go to the litterbox on it, run over it with a 450lb Celebrity motorised wheelchair, stomp on it, use a large claw hammer in order to smash it open to check it for candiosity, fire it from the cannoņata (I guess I've been watching the TV program "Viva Piņata" too much again - candiosity is usually checked with a laser-type device on a platform with a large readout, with a handheld wand that Langston Lickatoad uses, or with a pack-of-cards-sized device that Fergy Fudgehog uses; and the cannoņata is only used to shoot piņatas to piņata parties away from picturesque Piņata Island), send it to the Daystrom Institute for additional analysis, or perform other indecencies on it that a flashlight might have to have performed on it. So this section of the web page will be a bit more bare than this section of the web page on a page about a flashlight.

I tried to cut through the finish to bare Metalwargreymon - er - the bare Metalblacktyrannomon - um that's not it either...the bare Metalmegaseadramon...er...uh...wait a sec here...THE BARE METAL (guess I've been watching too much Digimon again! ) with the blade of a folding knife (there is what I believe is brass under the finish), and was successful.
Would I really try to chop up a brand spanken new laser that somebody paid perfectly good money for?
You bet your sugar-coated toilet muscle (sweet patootie) I would, if it's in the name of science -- and if I've been givenm explicit written consent (not just implied oral consent!) to do so.

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

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

In a 532nm green laser (module 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 not water-resistant, so please be extra careful when using it around sinks, tubs, toliets, 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.

VERY IMPORTANT!!! This laser is NOT a toy, and you MUST NOT shine it into your eyes, other people's eyes, pets' eyes, for that matter, the eyes of any person or animal you encounter. Eye damage can occur faster than the blink reflex can protect them, regardless of what species' eyes you irradiate with this laser. So just don't do it.
And fer Christ sakes (and for heaven sakes and for Pete sakes and your sakes too) do not shine this laser at any vehicle, whether ground-based like a motorcycle, car, or truck, or air-based like a helicopter, airplane, or jet. And if you shoot it at a person in the dark and he or she turns out to be a police officer, he/she may think he's being targeted, unholster (pull out) his/her gun, and hose you down with it.

This is a CDRH Class IIIB laser device (measures 6.885mW). Treat it with respect, and it'll treat you with respect.

Beam photograph on the test target at 12".
Beam image bloomed a bit in this photograph, despite my having taken it in the daylight hours.
Measures 6.885mW on a Sper Scientific Pocket Laser Power Meter # 840011.

Beam photograph on a wall at ~10 feet.
Beam image also bloomed *SUBSTANTIALLY*.

Those colored graphics that you *MAY* (or *MAY NOT*) see toward the left are my "Viva Piņata" posters, that clock near the right-center that looks like a gigantic wristwatch is my Infinity Optics Clock, and that rectangular clock to the far right is my GForce Power LED Calendar Clock.
You may also be able to see two of my SpongeBob SquarePants plush (Squidward Tentacles & Patrick Star) and a Digimon plush (Greymon).

Spectrographic analysis
Spectrographic analysis of this laser.
Note the small NIR line from the pump diode.
Note too that I said "SMALL" here; this tells me that the IR filtering is adequate at worst.

Spectrographic analysis
Spectrographic analysis of this laser; spectrometer's response narrowed to a band between
800nm and 820nm and sensitivity was enhanced to show NIR emission from the pump diode.

USB2000 spectrometer graciously donated by P.L.

ProMetric analysis
Beam cross-sectional analysis.

Image made using the ProMetric System by Radiant Imaging.

Test unit was sent by a fan of the website and was received at 4:44pm PST on 02-18-11 (or "18 Feb 2011" or even "Feb 18 Twenty Double Sticks" if you prefer).

UPDATE: 00-00-00

Has a hefty, "not cheap" feel
Nice beam quality
Uses batteries that are common and relatively inexpen$ive
The price is right...O WAIT!!! Isn't that a TV game show?

Not waterproof or submersible - but most modules aren't. Will not figure into my rating
More delicate than directly-injected diode laser pointers/modules. Again, will not figure into my rating
Power output is a bit above the labelled maximum; pushing the laser into Class IIIb territory - this is what nocked that last ― star off

    PRODUCT TYPE: Green DPSS laser module
    LAMP TYPE: DPSS laser
    No. OF LAMPS: 1
    BEAM TYPE: Very narrow spot
    SWITCH TYPE: Momentary pushbutton on/off on barrel
    BEZEL: Metal; collimating lens inset into a hosel for it
    BATTERY: 2x AAA cells
    CURRENT CONSUMPTION: Unknown/unable to measure
    WATER- AND URANATION-RESISTANT: Very light splatter-resistance at maximum
    ACCESSORIES: Unknown; but probably at least two AAA cells; possibly a presentation case
    WEIGHT: Not equipped to weigh
    COUNTRY OF MANUFACTURE: Not known; though very probably China
    WARRANTY: Unknown


    Star RatingStar Rating

5mW 532nm Green Beam Laser Module Pen (2) *

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