Output Intensity Variations of the Laser Used in a Prism Coupling System and Its Application
ZHANG Xiao-Kang1,2, LIAO Chang-Jun2, LIU Song-Hao2
1School of Physics, South China University of Technology, Guangzhou 510640
2Information and Electron Technology Institute, South China Normal University, Guangzhou 510631
Output Intensity Variations of the Laser Used in a Prism Coupling System and Its Application
ZHANG Xiao-Kang1,2;LIAO Chang-Jun2;LIU Song-Hao2
1School of Physics, South China University of Technology, Guangzhou 510640
2Information and Electron Technology Institute, South China Normal University, Guangzhou 510631
Abstract： The output intensity variations of the laser used in a prism coupling system are observed and found to be induced by the external optical feedback, which comes from the reflection on the prism. The intensity variations are explained with laser theory. The trough in the intensity variation corresponds to the position of the prism when the output light beam propagates perpendicularly to the prism. Based on the trough a new method for rotating the prism and reading out the step numbers is proposed, by which the angle 0° in the system need not to be calibrated. It is proven by experiment that the new method would improve the accuracy of the refractive index up to ±0.00001 and thickness to ±1nm.
ZHANG Xiao-Kang;LIAO Chang-Jun;LIU Song-Hao. Output Intensity Variations of the Laser Used in a Prism Coupling System and Its Application[J]. 中国物理快报, 2005, 22(12): 3071-3073.
ZHANG Xiao-Kang, LIAO Chang-Jun, LIU Song-Hao. Output Intensity Variations of the Laser Used in a Prism Coupling System and Its Application. Chin. Phys. Lett., 2005, 22(12): 3071-3073.
2005, Vol. 22 
