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405nm RECHARGEABLE
VIOLET PORTABLE LASER W/ ADJ. FOCUS

405nm Violet Portable Laser w/ Adjustable Focus + Charger, retail $20.00
Manufactured by: (Unknown)
Last updated 04-14-14

(In reference to the padded envelope I received from an Ebay seller on the afternoon of 04-12-14):
{sung like the Foreigner song "Feels Like the First Time"}

The 405nm Violet Portable Laser w/ Adjustable Focus + Charger (hereinafter, just called a "violet portable laser") is a violet-emitting, directly-injected laser. That is, it produces violet laser radiation directly, without the need for messy, fragile nonlinear crystals like those green laser pointers and the amberish-yellow and blue ones as well. It uses a single 18650 rechargeable lithium cell.

And its beam focus is very easily adjustable by simply turning a ring on the laser's "business-end".

It produces 125mW of laser radiation at a wavelength (spectrographically measured) of 413.570nm.

This is the reason I call it a "portable laser" on this website instead of a "pointer". Lasers designated as "pointers" must -- by US law anyway -- have a power output that does not exceed 5mW.

It comes in a handsome aluminum body with a black finish.

SIZE

To get the laser to turn on, first be certain that there is an 18650 rechargeable cell installed. If there isn't, then install it (see directly below), and THEN you can go irradiate something.

Insert one of the furnished interlock keys into the tailcap and rotate it approx. ¼ of a turn clockwise (as though tightening it). The key may be left in place or removed at this point.

Now, aim the laser well-away from your face.

Press & hold down the button on the barrel for as long as you want or need the laser spot, and release pressure on the button to turn the laser back off.

To adjust the focus, turn the knurled ring on the laser's bezel counterclockwise (as though loosening it) to bring the beam's focal point closer to the aperture, and turn it clockwise (as though tightening it) to bring the beam's focus farther away; when it stops turning, the beam is focused to infinity (where the laser beam comes out like what you'd expect to see -- it stays narrow for a decent distance)

When finished using the laser, insert the interlock key into the tailcap and rotate it approx. ¼ of a turn counterclockwise (as though loosening it). Pull the key straight out and stash it away. This completely neutralises the laser so that somebody who might pick it up won't be able to fire it off even if a charged battery is in the barrel.

To change the battery in this violet laser , unscrew & remove the tailcap, throw it into the dustbin (garbage can), tie off the bin liner (plastic garbage bag), carry it to outdoor wheelie bin (wheeled garbage can), throw it in, slam the lid down, and wait patiently for garbage day so that the dustman (garbage man) empties the wheelie bin into his dustcart (garbage truck)...O WAIT!!! THAT'S THE GOOD PART!!! So just set it aside instead.

Tip the used 18650 rechargeable cell out of the barrel and into your hand, and recharge it.

Insert a new 18650 rechargeable cell into the barrel, nipple-end (+) positive first.

The normal installation procedure is the opposite of how batteries are installed in most flashlights, so please pay attention to polarity here.

Screw the tailcap of the tube back on, and be done with it.
Aren't you glad that you didn't throw that tailcap away now?

Current usage measures 232.0mA on my DMM's 4A scale.

To charge the 18650 cell, insert it into the furnished charger, orienting it so that it's nipple-end (+) positive faces the skinnier end of the charger, unfold the AC prongs on the back, and plug the charger into any standard (in north America anyway) 2- or 3-slot household AC receptacle (wall outlet or even wall socket).

A red LED on the charger should now come on.
When this light turns green, the charge cycle is complete; you should now unplug the charger from AC power and remove the 18650 cell.

This is a self-contained laser , and not a flashlight meant to be carried around, thrashed, trashed, and abused - so I won't try to drown it in the toliet tank, bash it against a steel rod or against a concrete porch, let my mother's big dog's ghost or my sister's kitty cats piddle (uranate) on it, run over it with a 450lb Celebrity motorised wheelchair, stomp on it, use a small or medium 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.

This is a directly-injected laser though (which by their very nature are more rugged than DPSS lasers!), who's active components are the inverter circuit, the laser diode, and the collimating lens. So it should withstand accidents better than a DPSS (diode pumped solid state) laser - the type of laser assembly found in deep red (671nm), yellow (593.5nm), green (532nm), and light blue (473nm) laser pointers. These lasers have several additional components (crystals, filters, etc.) in the optical train, and you can knock them out of alignment by doing little more than looking at them the wrong way. And if any of these components are knocked out of whack, you'll no longer get your deep red, yellow, green, or blue laser beam.

Though you still do not want to intentionally drop your violet-emitting laser because it's a precision optical instrument.

***EXTREMELY IMPORTANT!!!***
This laser has a fair amount of {vulgar slang term for male nads} to it (measured at 125mW), so you ***DEFINITELY*** do not want to 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 para los motivos de Cristo (and for heaven sakes and for Pete sakes and for 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 turns out to be a police officer, he may think he's being targeted, unholster (whip out) his gun, and hose you down with it.

This laser feels wonderful to hold and use.

Laser power oputput analysis

Power output measures 125mW.

All measurements were made on a LaserBee 2.5W USB Laser Power Meter w/Thermopile.

Beam terminus photograph of this unique (well, "not-so-unique" now) laser on the target at 12".
Beam image bloomed ***SIGNIFICANTLY***.

That white & blue color does not really exist; the spot appears to be a very deep royal purple to the eye.
Digital cameras have a tough time at these wavelengths.

And yes, I know that the colors purple and violet are two different critters, but the phrase "royal violet" would not make very much sense; however, most everybody knows what "royal purple" looks like.
Purple is a mixture of red & blue; violet is a spectral color, encompassing wavelengths of ~390nm to ~410nm.

Beam terminus photograph on a wall at ~10'.
Again, that white & blue color does not really exist, and beam image bloomed a bit.

Spectrographic analysis of the Blu-ray laser diode in this product.
Wavelength appears to be ~410m, which is within specification for the type of laser diode used in this laser.

Spectrographic analysis of the Blu-ray laser diode in this product; but spectrometer's response narrowed to a band between 410nm and 420nm.
This shows that the wavelength is in fact 413.570nm.

The raw spectrometer data (tab-delimited that can be loaded into Excel) is at http://ledmuseum.candlepower.us/45/br30.txt

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.

In leiu of a beam cross-sectional analysis, I furnish the following photograph:

Brief video on YourTube showing the focus being adjusted.

O BOY! A laser beam widening & then narrowing!
So thrilling!!
So pulse-racing!!!
Actually, it kinda "maiks" "ewe" "wontt" "tu" "kik" "ovorr" "won" "uv" "thoz" "Penile-Whear®" "liggecher-rezistent" "prizen" "commbies" "ahnd" "thenn" "pruhseed" "tu" "bete" "thuh" "livengg" "tweadle" "owt" "uv" "itt" "withh" "uhn "olde" "orr" "uzed" "tuthbrusche" doesn't it?

This video is 86.3095356827 megabytes (86,561,500 bytes) in length; dial-up users please be aware.
It will take no less than four hundred thirty one (!) minutes to load at 48.0Kbps.
This video is definitely ***NOT*** dial-up friendly!!!

TEST NOTES:
Test unit was purchased on Ebay on 03-29-14 and was received on the afternoon of 04-12-14.

UPDATE: 00-00-00

PROS:
Color is very radiant & unusual for a handheld laser
Easily-adjustable focus
The price is right!
Labelled properly for wavelength and power output
Color is very radiant an unu...o wait, I said that already!!!

NEUTRAL:
Not very water-resistant and definitely not submersible -- this is par for the course with most portable lasers though and will not affect rating

CONS:
No turn-on delay or emissions indicator that would normally be found on a CDRH Class IIIb laser; this is what nocked that last ½ star off its rating

Unknown

Focusable violet-emitting laser

Directly-injected 405nm violet laser diode

Adjustable; very narrow spot to narrow flood

N/A

Momentary on/off button on barrel

Aluminum

Metal; laser & lens recessed into its end

1x 18650 rechargeable lithium cell

232mA

Very light splatter-resistance at maximum

¡¡¡UN FANTASMA ESPANTOSO GRANDE QUE TOMA UNA MIERDA ENORME EN UNA CESTA DE PAPEL USADO PLÁSTICA, NO!!!

1x 18650 rechargeable cell, charger, two interlock keys, lanyard

155mm L x 22mm Dia.

116.6g (4.110 oz.)

Unknown, but likely China or Hong Kong

Unknown/not stated

405nm Violet Portable Laser w/ Adjustable Focus + Charger *

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