Analysis the Performance of Controllers for He-Ne Laser Stabilization by Combination of Frequency Locking and Power Balanced Methods for Nano-Metrology Applications

Authors
Mahsa Bagheri 1
Saeed Olyaee 2
Erich Leitgeb 3
1 MSc Student, Faculty of Electrical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran, nbm.
2 Associate Professor, Nano-photonics and Optoelectronics Research Laboratory (NORLab), Shahid Rajaee Teacher Training University, Tehran, Iran,.
3 Professor, Graz University of Technology, Institute of Microwave and Photonic Engineering, Graz, Austria,
Abstract
In this paper, analysis the performance of PI, PI-like fuzzy, and parallel fuzzy P+ fuzzy I controllers for He-Ne lasers frequency stabilization by combination of frequency locking and power balanced methods is presented. He-Ne lasers can be attributed to an unstable system due to the influence of environmental factors on its' frequency. Therefore, the stabilization of He-Ne laser is so important in sensitive applications such as laser interferometers and nanometrology systems. The simulation results of controllers by powerful software MATLAB/SIMULINK-GUI show that parallel fuzzy P+ fuzzy I controller has better stabilization performance and integrated absolute error (IAE) than others. Also, frequency fluctuations of He-Ne laser is about 2×10-11 by parallel fuzzy P+ fuzzy I controller.

Keywords
Cavity Length
Controller
He-Ne Lasers
Nanometrology
Thermal Instability
The Modares Journal of Electrical Engineering
Volume 13, Issue 4
Winter 2014
Pages 93-98