Abstract

Laser-diode technology has two major subjects: linewidth reduction and frequency stabilization. To date, several frequency stabilization schemes for laser diodes that involve the use of Fabry-Perot interferometers, atomic transition lines, and molecular absorption lines have been proposed. For operation in the 1.5-μm region of present optical transmission interest, the following schemes have been investigated: the use of ammonia absorption lines at 1.519 μm,¹ the krypton optogalvanic effect at 1.5339 μm,² and second-harmonic generation of 1.56-μm laserdiode radiation and an atomic rubidium line.³ However, these schemes lack good frequency stabilization, long-term frequency stability, and small device size, which are required for practical use.

© 1991 Optical Society of America