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This is actually quite wrong. For another experiment just for fun, take a green laser and shine it through extra virgin olive oil. The result will shock you completely!
No, you are wrong again. Research what's actually happening when the green beam turns red.
Actually, those nice green lasers you may see are actually pumped by an infra-red laser diode. These are referred to as DPSS or double pumped solid state.
Generally speaking, DPSS green lasers are approximately 20% - 30% efficient. That is, a green DPSS lasers using a 200mW 808nm pump diode should produce a 40mW to 60mW 532nm green laser pointer. However, as there are various lenses and filters (such as an infrared or IR filter) involved in the process of producing green light, the efficiency level is sometimes less. The efficiency depends on the quality of crystals and lenses used in the laser pointer.
Blue DPSS lasers actually use a similar process. The infrared 808 nm laser diode is used to pump a Neodymium Yttrium Vanadium Oxide or Nd:YVO4 crystal. The outcome is an infrared light with a wavelength of 946nm. This 946nm light is then frequency doubled via a Lanthanum Boron Oxide or LBO crystal to produce a 473nm blue laser. As the efficiency for blue lasers is only around 3%-5%, blue laser pointers are relatively weak in power.
Dude your aargument music to my ears. People like you step it up !
This is also the reason that a green laser of 200-300mW costs the same as a 1 - 1.5W infra-red laser - the diode for both is the same. One simply has the crystal that changes the colour, but you only get 20-30% efficiency. So you get the colour change, but at a high cost to the power. Oddly though, from a purely visual point of view, a green laser at 200mW seems much brighter at a far greater distance than a 200mW red laser or blue laser etc.
I should also clarify that blue "DPSS" lasers are weak in power.
Actual blue lasers are quite powerful. I have a couple 1.6W blue laser pointers, and I can light a cigarette from across the room!
Yes. you CAN sort of "change" its color. *if you have something that can poke a VERY tiny hole.
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Posted:Nov 8, 2009
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