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More information that anyone should know about green laser pointers (bonus points because it already sold out).
Green laser pointers appeared on the market circa 2000, and are the most common type of DPSS lasers (also called DPSSFD, diode pumped solid state frequency-doubled). They are much more complicated than standard red laser pointers, because laser diodes are not commonly available in this wavelength range. The green light is generated in an indirect process, beginning with a high-power (typically 100-300 mW) infrared AlGaAs laser diode operating at 808 nm. The 808 nm light pumps a crystal of neodymium-doped yttrium aluminum vanadate (Nd:YVO4) (or Nd:YAG or less common Nd:YLF), which lases deeper in the infrared at 1064 nm. The vanadate crystal is coated on the diode side with a dielectric mirror that reflects at 1064 nm and transmits at 808 nm. The crystal is mounted on a copper block, acting as a heatsink; its 1064 nm output is fed into a crystal of potassium titanyl phosphate (KTP), mounted on a heatsink in the laser cavity resonator. The orientation of the crystals must be matched, as they are both anisotropic and the Nd:YVO4 outputs polarized light. This unit acts as a frequency doubler, and halves the wavelength to the desired 532 nm. The resonant cavity is terminated by a dielectric mirror that reflects at 1064 nm and transmits at 532 nm. An infrared filter behind the mirror removes IR radiation from the output beam, and the assembly ends in a collimator lens.
Nd:YVO4 is replacing Nd:YAG and Nd:YLF due to lower dependency on the exact parameters of the pump diode (therefore allowing for higher tolerances), wider absorption band, lower lasing threshold, higher slope efficiency, linear polarization of output light, and single mode output. For frequency doubling of higher power lasers, LBO is used instead of KTP. Newer lasers use a composite Nd:YVO4/KTP crystal instead of two discrete ones.
Some green lasers operate in pulse or quasi-continuous wave (QCW) mode, to reduce cooling problems and prolong battery life.
My tracker of choice has said that it will be 10 more minutes for 40 minutes now. They either have a ton of these things or nobody wants to buy the "camel" colored ones.
Edit: Nice, it says there's -43 seconds left on the item now.
Trevor on
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Goose!That's me, honeyShow me the way home, honeyRegistered Userregular
edited February 2009
God I wish I had money.
Razer Diamondback 15 bucks.
Wireless USB adapter 8 bucks.
Goose! on
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Goose!That's me, honeyShow me the way home, honeyRegistered Userregular
edited February 2009
lol a kite for a penny.
Goose! on
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Goose!That's me, honeyShow me the way home, honeyRegistered Userregular
edited February 2009
Oh gosh someone buy me the keyboard I'll pay ya back honest.
Ok, external HDD enclosure. What interface is it?! Argh.. I have a spare 500GB SATA drive and I would love this for it, but they don't tell you what interface it's using other than USB or network.
Google is my friend. IDE. (Though it does normally retail for $65)
Posts
More information that anyone should know about green laser pointers (bonus points because it already sold out).
Nd:YVO4 is replacing Nd:YAG and Nd:YLF due to lower dependency on the exact parameters of the pump diode (therefore allowing for higher tolerances), wider absorption band, lower lasing threshold, higher slope efficiency, linear polarization of output light, and single mode output. For frequency doubling of higher power lasers, LBO is used instead of KTP. Newer lasers use a composite Nd:YVO4/KTP crystal instead of two discrete ones.
Some green lasers operate in pulse or quasi-continuous wave (QCW) mode, to reduce cooling problems and prolong battery life.
Green are especially cool though.
Edit: Goddamn beat.
Edit: Nice, it says there's -43 seconds left on the item now.
Razer Diamondback 15 bucks.
Wireless USB adapter 8 bucks.
this is going to take so long
People who got the e-mail that there's going to be a Woot-off tonight and need a vacuum, that's who.
COME FORTH, AMATERASU! - Switch Friend Code SW-5465-2458-5696 - Twitch
fuck youll buy $600 projectors in like 1 minute but this guitar lasts hours
Bijaz - Ironbreaker
At least we are done with the guitars and onto digital picture frames. They do make good gifts.
I hope a can get another Bag of Crap from them. They are totally worth the dollar.
edit: The picture frames sold out as I submitted, we now have a Dazzle DVD recorder up. What the hell? DAZZLE?
"Read twice, post once. It's almost like 'measure twice, cut once' only with reading." - MetaverseNomad
Bijaz - Ironbreaker
Someone let me algorhythm (steve_0990) into the PA Steam group
Bijaz - Ironbreaker
"Read twice, post once. It's almost like 'measure twice, cut once' only with reading." - MetaverseNomad
i just want to know what person buys 3 of those things
Someone who hates both themselves and their neighbors? Or wants to give a gift and hates that person as well.
Really just someone with a lot of hate.
"Read twice, post once. It's almost like 'measure twice, cut once' only with reading." - MetaverseNomad
Bijaz - Ironbreaker
Google is my friend. IDE. (Though it does normally retail for $65)
Anyone get anything cool? I have no money to spare right now, so I didn't have a chance to buy anything. Though I didn't really see much anyway.
And I missed the BoC's by a minute.
COME FORTH, AMATERASU! - Switch Friend Code SW-5465-2458-5696 - Twitch