Old 11-26-2009, 06:06 PM #1
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Default difference between blue and green

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


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Old 11-26-2009, 06:09 PM #2
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Default Re: difference between blue and green

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.
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Old 11-26-2009, 06:39 PM #3
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Default Re: difference between blue and green

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,
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Old 11-26-2009, 06:49 PM #4
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Default Re: difference between blue and green

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Originally Posted by Hallucynogenyc View Post
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
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...
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Old 11-26-2009, 07:02 PM #5
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Default Re: difference between blue and green

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Originally Posted by VW View Post
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...
/agreed
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Old 11-26-2009, 07:11 PM #6
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Default Re: difference between blue and green

Quote:
Originally Posted by Hallucynogenyc View Post
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.
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.


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Originally Posted by Hallucynogenyc View Post
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
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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Old 11-26-2009, 07:14 PM #7
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Default Re: difference between blue and green

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

@pullbangdead: great info. +1! (thanks for correcting me)
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Old 11-26-2009, 07:21 PM #8
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Default Re: difference between blue and green

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Originally Posted by Hallucynogenyc View Post
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
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 Personally, I won't abandon the laser hobby. I want to live the day of affordable blue and yellow lasers!

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Old 11-26-2009, 08:06 PM #9
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Default Re: difference between blue and green

Quote:
difference between blue and green
473nm - 532nm = -59nm
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Old 11-26-2009, 08:14 PM #10
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Default Re: difference between blue and green

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473nm - 532nm = -59nm
Made me lol.

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Old 11-26-2009, 09:14 PM #11
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Default Re: difference between blue and green

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....
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Old 11-26-2009, 09:31 PM #12
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Default Re: difference between blue and green

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Originally Posted by BuildAbluraylaser View Post
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....
An Anti-EM field wave...it'd suck "light"
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Old 11-26-2009, 09:42 PM #13
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Default Re: difference between blue and green

-59nm, obviously.

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Old 11-26-2009, 10:09 PM #14
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Default Re: difference between blue and green

^They should use that stuff in IQ tests haha...
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Old 11-27-2009, 05:43 AM #15
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Default Re: difference between blue and green

all you need is the -59nm cube, I have plenty, PM me for them, I accept paypal and unicorn hair.
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Old 11-27-2009, 08:00 AM #16
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Wink Re: difference between blue and green

..... minus 59 nm ? ..... you divided "i" by zero somewhere, right ? ..... (j/k )
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