video thumbnail 8:09
Make Lasers Change Color! DPSS Lasers and Second Harmonic Generation (Frequency doubling)

2018-03-05

[public] 49.3K views, 2.49K likes, 24.0 dislikes audio only

channel thumbThe Thought Emporium

With powerful enough lasers, the world starts behaving very differently. Using a nonlinear optical process called second harmonic generation you can merge pairs of photons in a laser beam to create a single photon with twice the energy. This means that one color of light is turned into another.

In practice this is done with infrared lasers which when shot through a special crystal merge to form a color like blue or green depending on the setup.

The laser I'm using I got online for less than $100, but it contains a 2.5w IR (808nm) laser, and a 50-100mw blue (473nm) laser. The machine itself is also a decommissioned Raman spectroscope, which I'll be trying to repair.

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Intro
/youtube/video/sF2RDJISnAs?t=0
Laser Overview
/youtube/video/sF2RDJISnAs?t=62
Laser Crystal
/youtube/video/sF2RDJISnAs?t=104
Four Level System
/youtube/video/sF2RDJISnAs?t=164
Variable Energy Drop
/youtube/video/sF2RDJISnAs?t=175
Optical Cavity
/youtube/video/sF2RDJISnAs?t=185
Nonlinear Crystal
/youtube/video/sF2RDJISnAs?t=202
Symmetrical Crystal
/youtube/video/sF2RDJISnAs?t=230
Second Harmonic Generation
/youtube/video/sF2RDJISnAs?t=291
Frequency Doubling
/youtube/video/sF2RDJISnAs?t=358
Green Lasers
/youtube/video/sF2RDJISnAs?t=404
Outro
/youtube/video/sF2RDJISnAs?t=448
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