Sinusoidal phase-modulating laser diode interferometer using photothermal modulation

Optical engineering for sensing and nanotechnology : International conference on optical sensing and nanotechnology : Jun 1999, Yokohama, JapanA laser diode interferometer that uses accurate photo-thermal modulating technique is proposed. Since this technique of photo-thermal method modulates just a wavelength of the laser diode, measurement accuracy is not affected by an intensity modulation that is used to be appeared in the current modulation. The fundamental characteristics of this technique is investigated in detail. The new setup is tested, and its accuracy compared with that of an earlier system