Abstract

The HOE (holographic optical element) offers many advantages not found in conventional optics. However, because its operation is very sensitive to wavelength, it cannot be generally used even with laser diodes whose spectrum width and/or wavelength drift may be as large as several nanometers. Also if the laser is in multimode, multiple images will be formed. Therefore simply stabilizing the wavelength of the laser diode using temperature control is generally not adequate. For some specific applications, the wavelength sensitivity can be compensated by a second hologram so that the system can function satisfactorily over a ±, –5-nm range.¹ in general, when the wavelength is changed, there is an angular shift and a position shift of the image, and in addition a wavefront distortion.

© 1986 Optical Society of America