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Automatic control of output energy in frequency-doubled Nd:YAG laser by close-loop the SHG crystal orientation

A. LAZAR1,3,* , O. DONTU1, T. JITSUNO2,3

Affiliation

  1. Politehnica University of Bucharest, Bucharest 060042, Romania
  2. Institute of Laser Engineering, Osaka University, Japan
  3. Extreme Light Infrastructure – Nuclear Physics (ELI-NP), Horia Hulubei National Institute for Physics and Nuclear Engineering, Reactorului 30, 077125 Măgurele-Ilfov, Romania

Abstract

This paper presents a closed-loop energy control system for frequency-doubled Nd:YAG lasers. The automatic energy adjustment was done by changing the second harmonic crystal orientation according to the energy measured by a sensor. An experimental configuration for the output energy stabilization in a low-energy frequency-doubled Nd:YAG laser was designed. An electrically actuated mechanism to rotate the KTP crystal was used to adjust the SHG output energy by changing the angle to the incident laser beam. The shaft of the motor movement is controlled with the electrical signal generated by a minicomputer. The control system was tested at the low energy level in the mJ range and a good control of second harmonic generation was obtained. The output energy was kept at 3.0 ±0.2 mJ. A short introduction about how frequency-doubled Nd:YAG laser work and its importance of stabilizing output energy are presented.

Keywords

Frequency-doubled Nd:YAG laser, Second harmonic generation, Automatic control.

Citation

A. LAZAR, O. DONTU, T. JITSUNO, Automatic control of output energy in frequency-doubled Nd:YAG laser by close-loop the SHG crystal orientation, Optoelectronics and Advanced Materials - Rapid Communications, 17, 5-6, May-June 2023, pp.208-213 (2023).

Submitted at: Feb. 10, 2023

Accepted at: June 6, 2023