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Old 09-06-2010, 12:51 PM #1
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Default Yellow/Orange dpss science

From what I have read, the frequency doubling mechanism is pretty intricate in these devices, and is based on a raman transition. Could someone explain the science behind these lasers?


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Old 09-06-2010, 05:45 PM #2
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Default Re: Yellow/Orange dpss science

Really sounds interesting, I have no lasers of this type yet. I know it is possible to lase a Nd:YAG resonating on 1064nm and 1319nm, photons enter the electrons cloud atoms at both freqs making the atom got an "virtual" excited state and due to the raman effect (1064+1319)/2=1191.5nm. I suppose residual red and green gets filtered/reflected at this point and some other crystal is used here to freq double the 1191nm getting the ~595nm. This is only my GUESS. I have no idea if this is the way they do it, nor it is right. For sure some weird materials/crystals/filters are been used here, this lasers have a very poor efficiency ratio so LOT of energy are wasted in the middle, like a bunch of filters and low efficient Raman transitions (per definition) are really happening, also explaining the complexity/price for this almost yellow lasers.

Hope someone can clarify this. Not sure this is the adequate thread, sorry if it isn't.
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Old 09-06-2010, 08:55 PM #3
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Default Re: Yellow/Orange dpss science

It is the right thread, thank you for clarifying the situation somewhat. BTW, can you explain to me what is a raman transition? I am familliar with basic LASER science, but this part seems to have eluded me.
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Old 09-06-2010, 08:55 PM #4
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Default Re: Yellow/Orange dpss science

From an earlier thread, edited for brevity. Basically, it's nonlinear optics, and it takes some real studying to get at the heart of the issue there.

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Originally Posted by pullbangdead View Post

At least one way to make 593.5 is from using a BiBO (BiB3O6) crystal to combine the 1064 and 1343nm output lines from a Nd:YVO4 crystal, which can pumped by an IR laser diode at something like 808nm.

At least one way to make 589 is from using a periodically-poled LiTaO3 to combine the 1064 and 1319nm output lines from a Nd:YAG crystal, which can also be pumped by an IR laser diode at something like 808nm.

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Old 09-14-2010, 12:46 PM #5
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Default Re: Yellow/Orange dpss science

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Originally Posted by Marked One View Post
It is the right thread, thank you for clarifying the situation somewhat. BTW, can you explain to me what is a raman transition? I am familliar with basic LASER science, but this part seems to have eluded me.
It's what happens when you add hard Raman noodles to boiling water they become soft.
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Old 09-14-2010, 01:13 PM #6
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Talking Re: Yellow/Orange dpss science

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Originally Posted by steve001 View Post
It's what happens when you add hard Raman noodles to boiling water they become soft.
Shame to you .....

..... they are "ramen", not "raman" .....

On the serious side ..... is not too much easy to explain how exactly to work a "raman" laser (overall cause, more than a type of laser, "raman" is an effect ) ..... and there's a lot of lasers that uses this effect ..... raman scatter lasers (including raman coherent anti-stoke scattering high pressure cells) , raman silicon waveguide lasers, raman diamond crystal lasers, raman spin-flip lasers, raman hydrogen waveguide lasers, CaF2 resonators raman lasers, passively mode-locked raman lasers, and so on ..... and these units gives a lot of frequencies, not just yellow-orange ones ..... as example, silicon ones gives usually 1669,5nm, if i recall correctly ..... diamond crystal ones gives a good green at 573nm ..... and so on ..... it's a discretely complicated branch of nonlinear optical science
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