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I thought lasers only were ONE wavelength? why is IR emitted?

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Excuse the dumb question.... but I thought lasers only emitted light in their ONE particular wavelength.... so WHY do I hear about various red/green/blue lasers containing INFRARED light as well???

Someone shine a beam on this please!!
 

djQUAN

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And you also have laser diodes with multiple dies inside each giving a different wavelength for a different purpose (ex: CD/DVD lasers which have both red and IR diodes in one case)
 
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I'm aware 532nm DPSS lasers are actually frequency doubled 1064nm IR so it makes sense if some leaks through... But what about red 632 and blue 405/445 lasers? I thought the emitted some IR too for some reason... Or am I mistaken?
 

Hap

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I'm aware 532nm DPSS lasers are actually frequency doubled 1064nm IR so it makes sense if some leaks through... But what about red 632 and blue 405/445 lasers? I thought the emitted some IR too for some reason... Or am I mistaken?
Those are just diodes, no crystals involved :san:
 

123splat

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Do NOT forget, as noted by djQUAN, some older cd/dvd sleds have diode cans with two LASING elements (I.R & Red) for write (I.R.) & read (Red). few and far between, but they are out there.
 

ZRaffleticket

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Or you can have a sample diode that spits out 476nm and 480nm from being overdriven like styropyro does :p

A few other sample diodes do this :shhh:
 




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