Old 10-17-2009, 07:26 AM #1
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Default White laser diodes?

Is it possible to have a laser diode that emits white light, like we have LEDs that emit white light?


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Old 10-17-2009, 07:42 AM #2
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Default Re: White laser diodes?

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Originally Posted by Bearded_Galaxy View Post
Is it possible to have a laser diode that emits white light, like we have LEDs that emit white light?
It may be, but we don't have the technology yet

Generally, laser devices are monochromatic...
There are a few that produce several wavelengths simultaneously like Argons (and other gas lasers) and that badass white-light super-continuum laser...

White light can only be created by several wavelengths combined (Red, Green, and blue usually).
In white LEDs, the light is actually a product of using a blue LED and a yellow phosphor. This combination of yellow and blue wavelengths is perceived as white.
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Old 10-17-2009, 08:15 AM #3
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Default Re: White laser diodes?

Interesting. Is that then why some seem bluer and some seem yellower? More blue or more yellow phosphor?
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Old 10-17-2009, 09:23 AM #4
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Default Re: White laser diodes?

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Originally Posted by Bearded_Galaxy View Post
Interesting. Is that then why some seem bluer and some seem yellower? More blue or more yellow phosphor?
Yep.

The tint of a white LED is very sensitive to the amount of yellow phosphor applied to the LED die. Manufacturing variances during production result in different tints along the blue-yellow axis.
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Old 10-17-2009, 04:08 PM #5
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Default Re: White laser diodes?

It's known as color temperature, usually given in kelvins.
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Old 10-17-2009, 06:34 PM #6
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Default Re: White laser diodes?

It could be done with deveral dyes on one can, but it would have no practicality, and no use. It could not be focused very far, and would cost way more than its more effective counterpart - the LED.
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Old 10-17-2009, 07:17 PM #7
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Default Re: White laser diodes?

If you want a white laser you will have to combine red, green and blue beams, which is quite difficult...
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Old 10-17-2009, 07:26 PM #8
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Default Re: White laser diodes?

A white laser "diode" would have to consist of at least three separate diodes of different colors, joined into one module by optics and casing. It would be expensive, and at the time, impractical.

Remember how lasers work- the length of each laser cavity is very precisely measured.

-Mark
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Old 10-17-2009, 07:42 PM #9
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Default Re: White laser diodes?

There is a post here somewhere (I cant seem to find it now) that talks about a new white laser diode(I think) released at some technology fair in shenzhen china. If I remember correctly it was demonstrated as a "pointer".
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Old 10-17-2009, 07:46 PM #10
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Default Re: White laser diodes?

Quote:
Originally Posted by rocketparrotlet View Post
A white laser "diode" would have to consist of at least three separate diodes of different colors, joined into one module by optics and casing. It would be expensive, and at the time, impractical.

Remember how lasers work- the length of each laser cavity is very precisely measured.

-Mark
This ^

Remember, white doesn't have a wavelength of its own.
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Old 10-17-2009, 07:57 PM #11
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Default Re: White laser diodes?

Quote:
Originally Posted by BuildAbluraylaser View Post
If you want a white laser you will have to combine red, green and blue beams, which is quite difficult...

Oh it's not that difficult. Especially with Ar/Kr lasers or other whitelight gas lasers
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Old 10-17-2009, 09:19 PM #12
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Default Re: White laser diodes?

I was talking about using diodeS and DPSS systems like many
people do on the forum.
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Old 10-18-2009, 10:10 PM #13
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Default Re: White laser diodes?

http://laserpointerforums.com/f40/wh...hia-25266.html

Cool thread.
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