A laser Doppler velocimeter (LDV) using a semiconductor laser diode (LD) with its self-mixing effect has been developed. A Doppler signal, caused by mixing a returned wave with an originally existing wave inside the LD, is detected with a photodetector in the LD package; it is also picked up from the variation of the LD driving voltage. When the returned light is weak enough, it confirms that there is no change in the single-mode oscillation and its spectral width of the LD. A LDV of this type is compact enough for many applications.
© 1986 Optical Society of America
Original Manuscript: September 9, 1985
Published: May 1, 1986
S. Shinohara, A. Mochizuki, H. Yoshida, and Masao Sumi, "Laser Doppler velocimeter using the self-mixing effect of a semiconductor laser diode," Appl. Opt. 25, 1417-1419 (1986)