2-WAVELENGTH LASER INTERFEROMETER BASED ON THE FREQUENCY-DIVISION-MODULATED LASER DIODE SOURCES

Abstract

A two-wavelength interferometer based on the frequency-division-modulated laser diodes has been demonstrated. By employing this technique, the frequency difference between two laser diodes has been stabilized to less than 3.0 x 10(-9) and the synthetic heterodyne signal is also generated for measuring the optical phase shift absolutely.