Dragonlasers has new lasers (Blue, PGLIII & Orange)

[luvlasers]

Was browsing at the other place (laser pointer forum) and found this thread...

http://www.laserpointerforums.com/forums/YaBB.pl?num=1177937182

In brief, Dragonlasers is now selling blue laser pointers, PGLIII's and orange(?) laser pointers at http://dragonlasers.com/portable_lasers

Blue laser beams are just amazing, some top pics on this forum some where. PGLIII is great old school. The beam shots of the orange are cool.

I've heard these pointers called yellow but on my monitor they definitely look orange. What color is 594nm normally called?

 

[Daedal]

just found this really quick
[Wiki] http://en.wikipedia.org/wiki/1_E-7_m

it says orange

--DDL

 

[allthatwhichis]

I think 594nm should be yellow, but that is orange to me. They said 2 to 5mw at DL for the "yellow". It's probably a 1mW green and 4mw red... IT is a nice orange though.

 

[badhorsey]

I had the exact same model of 594nm laser. I would call the colour amber - it's definitely more orange than yellow.

Incidentally, the bit about creating an orange beam from a green and red laser is absolute bollocks; it's down to crystal doping to get the 593.5nm wavelength. Similar to what happens in a greenie, but you're suppressing the dominant wavelength.

 

[The_LED_Museum]

593.5nm is *CALLED* yellow, but is actually an amber color.
It's very similar in color to a low pressure sodium vapour streetlight - that has a dominant wavelength (how your eye sees it or where you would point to on a color chart) of 589nm.

From a laser engineer who emailed me regarding my yellow DPSS laser, comes this:

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The technology behind the yellow laser is a bit more involved than in the green laser, involving a process called sum frequency generation. It uses the same components that the green laser has, but the coatings are much different.

There are two particular "tricks" in making a sum frequency laser. The first is to get a single laser crystal (the Nd:YAG or Nd:YVO4) to lase simultaneously at two different wavelengths, both 1064 nm and 1342 nm. While we do this with gas lasers (Argon and Krypton) frequently, this is pretty rare with solid state. The relative powers of the two have to be in a reasonable range for the sum frequency process to work. The two waves are introduced in to the KTP crystal, which generates the 593.5nm output.
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[Kenom]

Not to mention how do they fit two laser diode assemblies inside that nice little slim pointer???

 

[Corona]

No no no, there is only ONE IR laser diode source in the pointer, it's called the "pump" and it excites a nonlinear optics / crystal (such as Nd:YAG or Nd:YVO4) into lasing at other wavelengths. These separate, coherent wavelengths are then mixed in another NLO and the sum or difference frequency (wavelength) is selected for transmission via filters or other optical means. The "other", unwanted wavelength (as well as the inherent "passthrough" IR radiation from the pump) is discarded (dissipated as heat) by the selectivity mechanism.

"Fusion of a red beam and green beam" sounds way cooler though.

DPSS "Greenies" are a simple version of this but instead of a mixer, the 2nd NLO is a frequency doubler.

 

[luvlasers]

The way the orange/yellow beam is generated sounds cool. Does anyone know a link to or have a picture/image of the diode and crystals setup?