I am looking for More power!

I am skimming through various laser guides and it seems that it may be cost effective to purchase an ir laser and apply some sort of a dielectric interference bandpass filter.

Are there rules about how these can be used. If I buy a laser that is 808 nm and use the bandpass filter on it, wouldn't it be possible to achieve a good green or blue laser?

Also considering the cost of large 1 watt green units, wouldn't it be possible to combine the beams of several smaller diodes into 1 beam. I would expect some power loss but would consider this possibly into a design in the future. Anyone have much experience combining multiple diodes of the same color.
Jayrobs white laser build gave me this idea. He measured the output when the beams were mixed and the output was greater than the single beam once they were fully mixed.

Mrmask said:

I am skimming through various laser guides and it seems that it may be cost effective to purchase an ir laser and apply some sort of a dielectric interference bandpass filter.

Are there rules about how these can be used. If I buy a laser that is 808 nm and use the bandpass filter on it, wouldn't it be possible to achieve a good green or blue laser?

Click to expand...

And...how would a filter turn IR light into a different color exactly?

I think you still need to do a bit more reading.

Mrmask said:

I am skimming through various laser guides and it seems that it may be cost effective to purchase an ir laser and apply some sort of a dielectric interference bandpass filter.

Are there rules about how these can be used. If I buy a laser that is 808 nm and use the bandpass filter on it, wouldn't it be possible to achieve a good green or blue laser?

Also considering the cost of large 1 watt green units, wouldn't it be possible to combine the beams of several smaller diodes into 1 beam. I would expect some power loss but would consider this possibly into a design in the future. Anyone have much experience combining multiple diodes of the same color.
Jayrobs white laser build gave me this idea. He measured the output when the beams were mixed and the output was greater than the single beam once they were fully mixed.

Click to expand...

I THINK WE ARE ALL a little confused about your post.
You need a KPT or BiBO crystal to do what you are talking about.
A bandpass filter ? what are you talking about? explain.

By the very definition of bandpass filter if you use an 808nm laser diode, it produces a monochromatic 808nm output, that means 808 and NOTHING MORE.

So if you put a 532nm bandpass filter in front of it, NOTHING AT ALL will pass through the filter, because there is NO 532 produced by the diode that is outputting 808 and nothing else.

Simple as that, now on to your next question....

You can combine four lasers of 250mw each to achieve a one watt output, but by the time you get all done, you will have spent more money and extended far more effort than if you had just purchased a 1 watt unit from the start.

Here are some tutorials and information portals that will answer your hunger for knowledge... give them a read and invest a little time, understand how the technology works,

Laser Resources (for n00bs and veterans alike!)

http://laserpointerforums.com/f36/looking-build-laser-read-me-47684.html

Sam's Laser FAQ (The Laser Bible)

Sam's Laser FAQ - Preface, Introduction, What is a Laser?, Safety

RP Photonics Encyclopedia of Laser Physics and Technology

Encyclopedia of Laser Physics and Technology - an Open Access Resource of In-Depth Information, Free Articles, Nonlinear and Fiber Optics

I have included a handy guide to assist you in finding what you need.





KTP

Jeez photonaholic, you change your avatars faster than I post :crackup:

On topic: OP, the wavelenght conversion is called DPSS system (Diode Pumped Solid State), where a diode is pumping a gain medium, which lases it's own wavelenght (very high spectral purity), which is then frequency doubled (meaning, it's wavelenght is halfed).

No filters here.

Ok so could I get a crystal to double the wavelength?

I know I am a bit new at this but I am thinking for builds a few years down the road. Plus I can start looking for cheap parts now out of old dead units.

So if I got like a 960nm diode what would I need to make it into a 480nm? Is there a name for this magic item that I could purchase separate with a ir diode?


The idea I had for combining lasers may be because of the lot sales I have seen on 50mw diodes. Also it looks like fun to mix colors. The mirrors and modules may get spendy so I understand what you mean.

Btw I have read most of Sam's Laser Faq. I actually find this site a little more specific in it's info. The faq talks a little hypothetical when you guys talk about projects in realistic terms. I have learned more from stalking this site for the last two months than reading anything else.

Directly doubling a diode is not easy at all. That's why the green/blue/other systems use a diode to pump Nd:YAG or Nd:YVO4, and then double/sum/whatever THAT output into the color wanted.

It's theoretically possible to directly double a 960nm diode, but in practice it'd be close to impossible, especially with your apparent level of experience and training (no offense intended here, but real professionals that do these things for a living have trouble doing what you suggest you want to do in your spare time).

Please for your own good, read, read, read some more and study.

Those links I posted for you are great, Go on google and type DPSS technology and read some more.

I assure you, no one here is going to read them to you, or hold your hand in class.

pullbangdead said:

Directly doubling a diode is not easy at all. That's why the green/blue/other systems use a diode to pump Nd:YAG or Nd:YVO4, and then double/sum/whatever THAT output into the color wanted.

It's theoretically possible to directly double a 960nm diode, but in practice it'd be close to impossible, especially with your apparent level of experience and training (no offense intended here, but real professionals that do these things for a living have trouble doing what you suggest you want to do in your spare time).

Click to expand...

I see, thanks for answering that. Seems like trouble and I will put my efforts elsewhere. And no offense taken my friend. I am a man filled with ideas and I came here to learn which of those are feasible.