Old 10-07-2009, 02:34 AM #1
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Question violet laser question

how do violet lasers work (diode type)
do they use crystals or something to convert ir light to violet light?


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Old 10-07-2009, 02:39 AM #2
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Default Re: violet laser question

No. Violet lasers (bluray) are diode type lasers (like reds) NOT DPSS modules (like greens).

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Old 10-07-2009, 03:00 AM #3
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Default Re: violet laser question

Here's the definitive book on the subject:
The blue laser diode: the complete story - Google Books
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Old 10-07-2009, 07:13 AM #4
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Default Re: violet laser question

Quote:
Originally Posted by pseudolobster View Post
Here's the definitive book on the subject:
The blue laser diode: the complete story - Google Books
Good book.



But yeah, like Dave said, no external crystals needed. 405nm lasers on here are just diodes: electrical energy is converted directly into 405nm coherent light.
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Old 10-07-2009, 09:21 PM #5
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Default Re: violet laser question

^


so u would need a crystal or something for green lasers?
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Old 10-07-2009, 09:26 PM #6
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Default Re: violet laser question

That's what the members posted above....

You also need crystals for 473nm BLUE Lasers...

Jerry
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Old 10-08-2009, 01:37 AM #7
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Default Re: violet laser question

wat are the blue crystals called and were can i get them?
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Old 10-08-2009, 09:07 AM #8
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Default Re: violet laser question

It's not as easy as you may think.

You don't just buy a crystal, shine a light on it, and get a blue laser beam.

When these crystals are grown in the lab (i think), most have defects.

Very few are good enough to lase. Very rare ones have little imprefections and have high efficiencies. You also need more than 1 crystal. (with green lasers, you need 2).

You also need the correct pump diode. Then you also need to allign them all PERFECTLY plus you need the optics to collimate the beam.

So, good luck.... lol
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Old 10-08-2009, 09:30 AM #9
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Default Re: violet laser question

HIGH POWER LASER DIODE SHG BLUE CRYSTAL BBO LBO KNBO3 - eBay (item 330365600413 end time Oct-11-09 23:36:05 PDT)

and I've heard it's extremely hard to get much out of these. You need like perfect alignment.
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Old 10-08-2009, 09:32 AM #10
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Default Re: violet laser question

ND:YVO4 generates 3 lines, the most common 1064nm used in greens is doubled with KTP. To get blue usually LBO or KN (KNBO3) is used to double the weaker 946nm line. Because this line is much weaker, crystals that generate a stable and high enough output of this line (to be useful) are much rarer and thus contributes to the high cost of these lasers.

There are DPSS Violet lasers, but they are not the common 405nm violet laser diodes used in most DIY projects or portable laser devices.

There are also DPSS UV lasers, which are desired when the need for a deep UV output is required and are very expensive.
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Old 10-08-2009, 10:48 PM #11
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Default Re: violet laser question

i will build my 4W ir laser then think about a crystal to put on it
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Old 10-08-2009, 11:10 PM #12
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Default Re: violet laser question

Quote:
Originally Posted by ultimatehacker View Post
i will build my 4W ir laser then think about a crystal to put on it
this always ends in fail, don't ask me why, others will explain better xD
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Old 10-09-2009, 12:09 PM #13
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Default Re: violet laser question

If you want a true blue, check out the group buy section.

I believe you can get 5mw (usually does over 10mw though) true blue for $315 shipped.

In the long run, you will end up wasting more money if you try to build it yourself.
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Old 10-09-2009, 12:26 PM #14
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Default Re: violet laser question

Quote:
Originally Posted by ultimatehacker View Post
i will build my 4W ir laser then think about a crystal to put on it
That would be easy if you owned a Laboratory and a Company.
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Old 10-09-2009, 09:02 PM #15
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Default Re: violet laser question

wat does DPSS stand for anyway?
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Old 10-09-2009, 09:23 PM #16
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Default Re: violet laser question

Diode-Pumped Solid State laser. Here's some good reading to familiarize yourself with the concept of DPSS: Sam's Laser FAQ - Solid State Lasers
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