Suppression of Mode Switching Noise in Wavelength Stabilized Laser Diodes by External Bragg Gratings

K. Häusler, R. Staske, G. Erbert, and G. Tränkle

Published in:

Proc. SPIE, vol. 8605, Photonics West, San Francisco, USA, Feb. 02-07, 86050R (2013).

© 2013 COPYRIGHT SPIE--The International Society for Optical Engineering. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the SPIE.


Special applications require low noise wavelength stabilized diode lasers for pumping of solid state lasers. We report on intensity noise in the frequency range of kHz to MHz due to bi-stable mode switching between external cavity modes in laser diodes with volume Bragg grating as external reflector. Two regimes of bi-stability are identified which are attributed to switching between longitudinal or lateral resonator modes. The origin of noise is explained by thermal bi-stability which can be suppressed by proper design of the external resonator. Low noise operation of single mode ridge waveguide lasers is demonstrated having the potential of scaling up the pump power by using ridge waveguide arrays.

Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany


laser diodes, space applications, Bragg grating, VBG, mode switching, noise, thermal bi-stability.