Fuzzy logic control of a nitrogen laser

Siu Chung Tam; Siong-Chai Tan; Wah-Peng Neo; Sze-Chern Foong; Choon-Hao Chan; Anthony Tung Shuen Ho; Hock-Chuan Chua; Sing Lee

doi:10.1117/1.1336530

1 February 2001 Fuzzy logic control of a nitrogen laser

Siu Chung Tam, Siong-Chai Tan, Wah-Peng Neo, Sze-Chern Foong, Choon-Hao Chan, Anthony Tung Shuen Ho, Hock-Chuan Chua, Sing Lee

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Optical Engineering, Vol. 40, Issue 2, (February 2001). https://doi.org/10.1117/1.1336530

Traditionally, the stability of the output of a laser is controlled through scientific means or by a simple feedback loop. For multiinput multioutput control and for medium- to high-power lasers, however, these control schemes may break down. We report on the use of a fuzzy logic control scheme to improve the stability of a pulsed nitrogen laser. Specifically, the nitrogen laser is modeled as a two-input two-output system. The two input parameters are the discharge voltage (V and nitrogen pressure (P), and the two output parameters are the pulse energy (E) and pulse width (PW). The performance of the fuzzy logic controller is compared with a decoupled two-channel PID (proportional+integral + derivative) controller. In our experiment, the long-term stabilities of the open-loop system are 1.82% root mean square (rms) for pulse energy and 4.58% rms for pulse width. The PID controller achieves better performance with long-term stabilities of 1.46% rms for pulse energy and 4.46% rms for pulse width. The fuzzy logic controller performs the best with long-term stabilities of 1.02% rms for pulse energy and 4.24% rms for pulse width, respectively.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Siu Chung Tam, Siong-Chai Tan, Wah-Peng Neo, Sze-Chern Foong, Choon-Hao Chan, Anthony Tung Shuen Ho, Hock-Chuan Chua, and Sing Lee "Fuzzy logic control of a nitrogen laser," Optical Engineering 40(2), (1 February 2001). https://doi.org/10.1117/1.1336530

Published: 1 February 2001

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