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Research on Frequency Stabilization of a Double Longitudinal He-Ne Laser by Digital Controll
Author: YangHongXing
Tutor: TanJiuBin
School: Harbin Institute of Technology
Course: Instrument Science and Technology
Keywords: Double - longitudinal-mode thermal frequency stabilization Frequency Stability Signal monitoring Digital controller
CLC: TN248
Type: Master's thesis
Year: 2007
Downloads: 317
Quote: 1
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Abstract
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Due to the development of precision processing technology, the laser interferometer is not only a high measurement accuracy, but also to meet the requirements of high-speed measurement of the mechanical movement. Based on the frequency stabilization method of double-longitudinal-mode laser light source has a frequency stabilization of simple structure, large frequency difference, anti-interference ability, good frequency reproducibility is widely used in high-speed ultra-precision laser interferometer measurement. In this paper, the principle of double-longitudinal-mode frequency stabilization, frequency drift caused factors, the corresponding frequency stabilization program design and implementation strategies according to the characteristics of the frequency stabilization and for conventional laser frequency stabilization system, the control algorithm debugging cumbersome, Warm-up time is longer, the analog controller parameter adjustment difficulties and other issues to take a series of targeted measures, design and implementation of a digital master controller frequency stabilization and dual-longitudinal-mode laser frequency stabilization warm-up and frequency stabilization control algorithm. Mainly to complete the following tasks: (1) According to the double-longitudinal-mode frequency stabilization program requirements, design of DSP-based digital master controller, with better than 16-bit high-precision analog input and output interfaces, high temperature, optical power difference accuracy acquisition, and high-precision control signal output, combined with RS232 bus to achieve the real-time output function of the laser state; (2) design, convenient and flexible operating system based on UC / OS-II digital master controller frequency stabilization laser control process of the establishment of the mandate and multi-task switching, man-machine dialogue, online debugging frequency stabilization algorithm parameters, is conducive to more complex frequency stabilization control algorithm debugging and running; (3) design based on the temperature of the platinum resistance sensor monitoring circuit, the circuit selection of high-performance amplifier and precision resistors combined with three-wire bridge to achieve a high precision measurement of the temperature, to provide a reliable guarantee for the preheating temperature of the amount of feedback frequency stabilization; (4) double vertical mode thermal frequency stabilization physical structure based on analysis of the system to warm up and the theoretical model and the transfer function of the frequency stabilization phase, and the system identification step, the cavity preheating control model parameters and frequency stabilization control model parameters; (5) According to the recognition result and control objectives designed based on PFC, preheat algorithm based on Smith-PI of stable frequency control algorithm, and the warm-up and frequency stabilization control experiments are given based on experimental data and evaluation results based on A Lun variance of laser frequency stabilization control results. Experiments show that the master design frequency stabilization, the temperature detection circuit and preheat frequency stabilization control algorithm for double-longitudinal-mode thermal laser frequency stabilization can quickly and accurately to preheat and frequency stabilization control objectives, warm-up time of less than 20min. The frequency stability evaluation system preliminary test 0.1s, 1s, 10s sampling, the Allan Variance laser frequency stability are the order of 10-10.
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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser
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