15 KILOWATT LASER! Measurement and Second Harmonic Generation

Episode 53

#optics
#laser
#nonlinearoptics

Let's measure the Twotrees 1064nm Laser Head, and investigate non-linear second harmonic generation, converting this IR Laser to Green!

1064 laser module： http://bit.ly/3ZTLKeZ

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In this video I explain how the TwoTrees 1064nm Infrared Laser works. This is a Diode Pumped Q-Switched Laser Nd YAG Laser, with a claimed peak output power of 15 Kilowatts!
Internally a Neodymium YAG rod is pumped by an 808nm Laser diode, and this a q-switched by means of a Cr:YAG saturable absorber, resulting in a nanosecond Laser with high peak powers. I measure the output with a Gentec Pyroelectric sensor and a Fast photodiode from Thorlabs.
In the second half o the video I explain Second Harmonic Generation (SHG) works. This is the process that is used in a green Laser pointer, and demonstrate this with a Potassium Titanyl Phosphate (KTP) nonlinear crystal generating a 532nm Green Laser Light! Of course everyone loves an obligatory Laser beam shot!


0:00 Intro
0:13 Laser description
0:58 How a Diode pumped Q-Switched Solid State Laser works!
2:47 Measurement setup
5:21 Measuring Pulse Width
7:19 Measuring Pulse Energy
7:46 Calculator
8:42 Collimating the beam
9:48 How Green DPSS Lasers Work
11:38 Second harmonic Generation Demonstration
12:04 Beautiful Green Beams!
13:48 Outro and Credits