Measurement of parameters C and α in optical feedback self-mixing interference system
SUN Xue-qun;YE Hui-ying;School of Information and Engineering,Zhengzhou University;71677 Troops;
A new measurement method of optical feedback level factor C and laser line width broadening factor α was proposed. Based on the optical feedback self-mixing interference model,the influences of C and α on the interference fringes were studied under the moderate optical feedback( 1 C 4. 6) levels. Three characteristic values were extracted from interference data,and analytical expression of three characteristic values,C and α was derived according to the mathematical model. The high accuracy measurements of C and α can be realized simultaneously when the change of the external cavity is unknown.
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