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Forums
4hv.org :: Forums :: Electromagnetic Radiation
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frequency doubler crystal?

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haxor5354
Sun Mar 13 2011, 11:41PM Print
haxor5354 Registered Member #2063 Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
 		so a green laser works by boubling the IR light's frequeny to green visible light right?
does it only double IR frequencies? has anyone tried to alligning 2 crystals together in series to quadrible IR frequencies?
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LIGHT
Mon Mar 14 2011, 01:55AM
LIGHT Banned on 4/6/2011 for unsafe, irresponsible behavior.
Registered Member #3442 Joined: Fri Nov 26 2010, 04:09AM
Location: ....
Posts: 114
 		The doubling crystal is most likely ND:YVO4, ths only work at around 808nm, what your saying wont work.

Take a look at his, read it well. Link2
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LIGHT
Mon Mar 14 2011, 02:01AM
LIGHT Banned on 4/6/2011 for unsafe, irresponsible behavior.
Registered Member #3442 Joined: Fri Nov 26 2010, 04:09AM
Location: ....
Posts: 114
 		Even if it did work, that would turn it into UV-C, which poses a cancer hazard, as it's ionizing.
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haxor5354
Mon Mar 14 2011, 02:06AM
haxor5354 Registered Member #2063 Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
 		so if it works, then we would have a death ray that cause cancers if exposed to the beam long enough?
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LIGHT
Mon Mar 14 2011, 02:10AM
LIGHT Banned on 4/6/2011 for unsafe, irresponsible behavior.
Registered Member #3442 Joined: Fri Nov 26 2010, 04:09AM
Location: ....
Posts: 114
 		It seems you are interested in lasers, when you little about them, I have been toying with them for a while, sign up to this forum.

You will get all the info you need.

And if your looking to build a 'burning laser', learn more about them first and buy safety goggles according to the wavelength.


Link2


If you have any question, PM me at Link2
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dmg
Mon Mar 14 2011, 03:08AM
dmg Registered Member #2628 Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
walshy155 wrote ...

The doubling crystal is most likely ND:YVO4, ths only work at around 808nm, what your saying wont work.

Im pretty sure the doubling crystal in most greens is KTP. the ND:YVO4 or ND:YAG is just used to achive 1064nm from 808nm, before doubling to 532nm.

The 808nm pump diode excites the ND:YVO4/YAG, which lases @ 1064nm (deeper IR), and its fed into a KTP portion for frequency doubling into 532nm (green).

Most common crystal sets though are ND:YVO4/KTP, without the KTP element, all you will get is 1064nm out.

KTP is fairly tollerant to a wavelenth shift by a few nm on its pump, but when you get into other DPSS systems like a 473nm, you will find that LBO crystals are even a bigger pain in the ass to work with, as they require even more strict temperture regulations for best efficiency, and may not even lase if the input is 2nm off.

Long story short, these crystals where designed for a specific input and output, anything else will typically not work.
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LIGHT
Tue Mar 15 2011, 01:07AM
LIGHT Banned on 4/6/2011 for unsafe, irresponsible behavior.
Registered Member #3442 Joined: Fri Nov 26 2010, 04:09AM
Location: ....
Posts: 114
 		Yes it is.
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dmg
Tue Mar 15 2011, 01:45AM
dmg Registered Member #2628 Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
LIGHT wrote ...

Yes it is.

Yes it is what Walshy? Please be more specific on your responces..
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Daedronus
Tue Mar 15 2011, 10:30AM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
GBD wrote ...

LIGHT wrote ...

Yes it is.

Yes it is what Walshy? Please be more specific on your responces..

This...probably... shades
"Im pretty sure the doubling crystal in most greens is KTP"
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Dr. ISOTOP
Tue Mar 15 2011, 01:07PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
 		Quadrupling does work; the second stage is often LBO.
Don't even think about doing it at home; serious green is hard enough.
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