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Green Laser for Infrared

Green Laser Infrared Emission

While it may not be too common to find an infrared laser, there is a relatively unknown source, green lasers.
The most common green lasers are actually infrared lasers, emitting natively 1064nm light. There is a second crystal used to double the frequency, and half the wavelength down to 532nm, providing green light. The infrared light should then be filtered out to get only green output. In cheaper green lasers, and most pointer style green lasers, this infrared filter is very weak or completely omitted, so the laser actually emits both green and infrared light at the same time.

You can see below, in visible light, the green emission of the laser is completely blocked by the infrared filter. When viewed in infrared, however, you can see that the infrared portion of the laser clearly goes through the infrared filter.

Infrared Green laser
Infrared green laser emission

WARNING! DO NOT point the laser into eyes, especially when filtered with an infrared pass filter. Your eyes will not be able to see any light or realize they are being damaged, but the very strong infrared light is still there and can damage your eye.

2 Responses

  1. Hello. How does the IR filter affect the total output from the lasers? If it published as a 100mw green laser for example, is that the visible green light or the amount generated by the diode? Does the IR filter reduce the overall output, so I might actually only get 80mw of visible green light if an IR filter is being used? Thanks.

    1. The power of the laser is usually defined as the original diode. Green laser diodes are typically an 808 nm laser that pumps an 1064nm laser, which is then frequency doubled to a green beam. There would be some power loss from the 808>1064, and then significant loss at the 1064 doulbing. I’m not sure what the ratio of IR-green light left is, but it is possible the green output is much less than 80% of the original power rating.

      Take that all with a grain of salt, as the laser maker might be publishing the actual power output. You would need to check their specifications. Also be careful with cheap high power lasers, a lot of them exaggerate the power rating, in our experience we have seen lasers labelled at a mW number that was higher than the allowance for the laser class they also labelled.

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