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difference between blue and green

DJNY

DJNY

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is anybody able to explain in a few words why it is so difficult to make a blue laser?
 





because in green lasers IR light frequency has to be duplied once, on a blue laser you need to do this twice. Every conversion results in a very big loss in power, stability, etc.. If green lasers are already difficult to make, blue lasers can become a nightmare.
 
It can always happen that someone discover how to produce blue diodes or a new type of crystals ;)

However, for lasershows the actual powers are already right, the CD/DVD/Blu-ray market is not interested since they already found a higher frequency diode type than blue (blu-ray). What I mean is that I doubt there's much people in the world trying to find a way to produce affordable blue lasers, so it's very improbable that we see this.

Yours,
Albert
 
Hallucynogenyc said:
It can always happen that someone discover how to produce blue diodes or a new type of crystals ;)

However, for lasershows the actual powers are already right, the CD/DVD/Blu-ray market is not interested since they already found a higher frequency diode type than blue (blu-ray). What I mean is that I doubt there's much people in the world trying to find a way to produce affordable blue lasers, so it's very improbable that we see this.

Yours,
Albert
Click to expand...
That sucks... It's a shame it's so hard to produce, even more of a shame that 593.5nm is even less eficient... It would be a dream to have these kinds of wavelengths in high power pointers...
 
Hallucynogenyc said:
because in green lasers IR light frequency has to be duplied once, on a blue laser you need to do this twice. Every conversion results in a very big loss in power, stability, etc.. If green lasers are already difficult to make, blue lasers can become a nightmare.
Click to expand...

Not exactly, they both take 2 steps. They both use an 808nm laser to pump a crystal. For green, the 808 pumps a crystal that lases at 1064nm, and then KTP doubles the 1064 to 532. For blue, the 808 pumps a crystal that lases at 946, and then LBO (or similar) doubles the 946 to 473.

the difference is that KTP is a more efficient doubling mdeium than the ones used for blue, and lasing at 1064 is more efficient than lasing at 946. But they both take exactly 2 steps.


Hallucynogenyc said:
It can always happen that someone discover how to produce blue diodes or a new type of crystals ;)

However, for lasershows the actual powers are already right, the CD/DVD/Blu-ray market is not interested since they already found a higher frequency diode type than blue (blu-ray). What I mean is that I doubt there's much people in the world trying to find a way to produce affordable blue lasers, so it's very improbable that we see this.

Yours,
Albert
Click to expand...

People, myself included, are working every day on blue and green laser diodes, which will be more efficient than DPSS modules by a long shot. They're not for optical storage media, you're right, but they will have applications in displays like projectors and TVs. Also, blue and green laser diodes will have a lot of applications in science and industry in general, replacing big complicated argon lasers and such.

In fact, blue and green laser diodes both already exist now, just not fully commercialized.
 
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It's just a matter of time. I still wouldn't discart that someone discover a way to produce a diode that can produce more than one wavelenght. Imagine cheap multicolor lasers being sold. One regulator for the power and another for the color. That would be roxy :D

@pullbangdead: great info. +1! (thanks for correcting me)
 
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Hallucynogenyc said:
It's just a matter of time. I still wouldn't discart that someone discover a way to produce a diode that can produce more than one wavelenght. Imagine cheap multicolor lasers being sold. One regulator for the power and another for the color. That would be roxy :D
Click to expand...

This day will come my friend, it's just a matter of time, as you said. The laser hobby is growing more popular everyday and besides that, science is improving a lot every single day. Just think how expensive even 5 mW greenies used to be and how cheap they have become nowadays :D Personally, I won't abandon the laser hobby. I want to live the day of affordable blue and yellow lasers!
 
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If I'm right the LBO crystals for blue lasers are also more complicated to create than the KTP type, and require very precise cutting of the facets to be efficient.

I have to say that pullbangdead summed it up very nicely.


I also heard and saw that they are trying to use blue lasers for holographic media storage; they want to reach a whopping 1TB per disk, if I remember correctly.


@Niko :

I would really want to see a -59nm laser.... :p
 
BuildAbluraylaser said:
If I'm right the LBO crystals for blue lasers are also more complicated to create than the KTP type, and require very precise cutting of the facets to be efficient.

I have to say that pullbangdead summed it up very nicely.


I also heard and saw that they are trying to use blue lasers for holographic media storage; they want to reach a whopping 1TB per disk, if I remember correctly.


@Niko :

I would really want to see a -59nm laser.... :p
Click to expand...

An Anti-EM field wave...it'd suck "light" :D
 
-59nm, obviously.

14-simplicity.jpg
 
all you need is the -59nm cube, I have plenty, PM me for them, I accept paypal and unicorn hair.
 
..... minus 59 nm ? ..... you divided "i" by zero somewhere, right ? ..... (j/k :p)
 
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