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532nm 5mW BLUE (GREEN-EMITTING) LASER PEN

532nm 5mW Blue (Green-Emitting) Laser Pen, retail $5.39
Manufactured by (Unknown)
Last updated 03-10-14

(In reference to the packet that I received in the mail on 12-22-13):
{sung like the Foreigner song "Feels Like the First Time"}

This is a green DPSS (diode pumped solid state) portable laser. It comes in what I believe is a brass body sporting a handsome blue finish with shiny chrome-colored trim.

It produces its green laser beam with a pair of AAA cells.

SIZE

Feed the portable laser two AAA cells that you furnish yourself first (see below), and then you'll be ready to rock.

To use the portable laser, 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 portable laser 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 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. 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 front portion back on, and be done with it.

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

This is a portable laser, not a flashlight. So I won't try to drown it in the toliet tank, bash it against a steel rod or against the concrete floor of a patio, let my mother's big dog's ghost or my sister's kitty cats spring a leak (uranate) on it, run over it with a 450lb Celebrity motorised wheelchair, stomp on it, use a medium or large ball peen hammer in order to bash it open to check it for candiosity, fire it from the cannoñata, drop it down the top of Mt. Erupto (I guess I've been watching the TV program "Viva Piñata" too much again

- candiosity is usually checked with a laser-type device on a platform with a large readout (located at Piñata Central {aka. "Party Central"}), with a handheld wand that Langston Lickatoad uses, or with a pack-of-cards-sized device that Fergy Fudgehog uses; the cannoñata (also located at Piñata Central) is only used to shoot piñatas to piñata parties away from picturesque Piñata Island, and Mt. Erupto is an active volcano on Piñata 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 ***SIGNIFICANTLY*** 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 portable laser, 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) radiation 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, 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.

Power output analysis

Power output peaks at 50mW on a LaserBee 2.5W USB Laser Power Meter w/Thermopile.

Beam photograph on the test target at 12".
Beam image bloomed somewhat; beam spot is also not white.

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 bloomed slightly when photographed.

Beam terminus photograph on a white wall comparing this laser with the Directly-Injected 5mW 515nm Green Laser Pen.
This laser is the leftmost spot.

Beam terminus photograph on freshly-fallen snow comparing this laser with the Directly-Injected 5mW 515nm Green Laser Pen.
This laser is the lowermost spot.

Another beam terminus photograph on a white wall comparing this laser with the Directly-Injected 5mW 515nm Green Laser Pen.
This laser is the rightmost spot.

Spectrographic plot

Spectrographic analysis of this laser.

Spectrographic plot

Same as above; spectrometer's response narrowed to a band between 528nm and 536nm to pinpoint wavelength, which is 533.730nm

The raw spectrometer data (tab-delimited that can be loaded into Excel) is at http://ledmuseum.candlepower.us/44/blugreen.txt

Ocean Optics USB2000 Spectrometer graciously donated by P.L.

A beam cross-sectional analysis would normally appear here, but the ProMetric System
that I use for that test was destroyed by lightning in mid-July 2013.

TEST NOTES:
Test unit was purchased on Ebay on 12-05-13, and was received on 12-22-13.

UPDATE: 00-00-00

PROS:
Very handsome blue finished body
Beam is clean with no artifacts (rings, blotches, or other evil little things) in it
Uses batteries that are quite common and relatively inexpen$ive

NEUTRAL:

CONS:
Way overspec (that's what nocked the most stars off its rating)
No CDRH-mandated laser warning labelling at all

Unknown

DPSS green-emitting laser pen

DPSS laser

Very narrow spot

N/A

Momentary on/off button on the barrel

Metal

Metal; laser ass'y recessed into hosel for it

2x AAA cells

Unknown/unable to measure

Very light splatter-resistance at maximum

¡¡¡EL CONEJITO DE PASCUA CEPILLARSE SUS DIENTES CON UN CEPILLO DE DIENTES QUE CAYÓ EN EL HIGIÉNICO, NO!!!

None

154mm L x 14mm Dia.

58.0g (2.040 oz.) incl. batteries

Unknown; possibly China, Korea, or Hong Kong

Unknown/not stated

532nm 5mW Blue (Green-Emitting) Laser Pen *

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