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532nm 1xCR123A PORTABLE DPSS LASER

532nm 1xCR123A Portable DPSS Laser, retail $UNKNOWN
Manufactured by Mr. Laser (no URL); physical address is:
9080 Telstar Ave Ste. 301, el Monte, CA 91731
Last updated 04-16-12

This is a green-emitting laser; styled not like the usual "pen" but more like a larger handheld portable laser.

It has a measured power output of 4mW at 532nm in the green part of the spectrum. Yes, I checked (spectrographically) for the presence of NIR radiation from the pump diode that might have queered the test, and none at all was found. So yes, that 4mW reading is totally comprised of the radiation from the green laser line.

This laser comes in an aluminum body (protected by what I believe is a baked enamel finish) and it feeds from a single CR123A lithium camera cell.

Size of product w/hand to show scale

SIZE

Feed the laser module a CR123A cell first (see below), and then you'll be ready to rock.

To use this fat pointer {and yes, I can legally call it a "pointer" on this website because its output is less than 5mW}, just aim it at something you wish to point out, and press & release the button on the tailcap for as long as you need the laser spot. Press & release the button again to turn the laser pointer back off. Yes, it really is as easy as that.

To change the battery in this laser, unscrew and remove the tailcap, carry it to the stairs leading to the basement, and huck it down those stairs so that it falls amongst thousands of hungry piss ants...who look at in unison for a moment, cock their heads like a puppy that doesn't understand what it had just been told, and then uranate on it...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead.

Tip the used CR123A cell out of the barrel and into your hand, and dispose of or recycle it as you see fit. Do not under any circumstances flush it down a toilet and for Christ sakes please do not throw it into a trout-filled stream.

Insert a new CR123A cell into the barrel, flat-end (-) negative first. This is the opposite of how batteries are installed in most flashlights, so please pay attention to polarity here.

Screw the tailcap back on, and be done with it.
Aren't you glad you didn't throw that tailcap into the basement with all of those hungry, hungry piss ants with full bladders now?

Current usage measures 133.90mA on my DMM's 400mA scale.

This is a portable laser, 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.

Besides, lasers are meant to be loved, not punished.

I did however, perform "The Knife Test" on it, and I was rather easily able to scratch the finish to bare metal -- leading me to believe that the finish is baked enamel rather than anodizing of any pedigree.

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.

Power output analysis performed on a LaserBee 2.5W USB Laser Power Meter w/Thermopile.
Power output measures 4mW; though as you can see I forgot my hat...er...uh...it's quite unstable {there I go thinking about the metal band Anthrax again!!!}

Short-term (770 seconds) stability analysis of this laser.
Note how stable {cough, sputter, sound of a toliet flushing} this laser is.

Beam terminus photograph on the test target at 12".

Beam terminus photograph on a wall at ~8 feet.

Spectrographic analysis of this laser.

Spectrographic analysis of this laser; spectrometer's response narrowed to a band between 530nm and 540nm to pinpoint wavelength, which is 534.445nm.

Spectrographic analysis of this laser; spectrometer's response narrowed to a band between 800nm and 830nm in an attempt to show NIR laser line from the pump diode -- as you can see this laser's IR filter does its job with excellence!

USB2000 Spectrometer graciously donated by P.L.

ProMetric analysis

Beam cross-sectional analysis.

Image made using the ProMetric System by Radiant Imaging.

TEST NOTES:
This laser was obtained from an unknown venue (most likely Ebay) quite a number of years ago (2006 or 2007); I could have sworn that I had it on my website, but darn-diddly-arn if I can find it now, so it gets a new web page & measurements as of 04-16-12.

UPDATE: 00-00-00

PROS:
Relatively low power usage means its battery will last
Constant-on function means you can use the laser hands-free
IR filter does its job very well

CONS:
Power output is remarkably unstable -- there goes at least two stars

Mr. Laser

Large green DPSS laser pointer

DPSS laser

Extremely narrow spot

Pushbutton click on/off on tailcap

Aluminum

Metal; laser & optics in a shallow recess

1x CR123A cell

133.90mA

Light splatter-resistance at maximum

﹛·ARA CRISTO NOSOTROS ﹛﹑O!!!

None (that I'm aware of anyway)

124mm L x 20.50mm D

Not equipped to weigh

USA

Unknown

532nm 1xCR123A Portable DPSS Laser *

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