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Semiconductor laser stabilization by external optical feedback

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3 Author(s)
Hjelme, D.R. ; Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA ; Mickelson, A.R. ; Beausoleil, R.G.

A report is presented on a general theory describing the effect of external optical feedback on the steady-state noise characteristics of single-mode semiconductor lasers. The theory is valid for arbitrarily strong feedback and arbitrary optical feedback configuration and spectrum. A generalized Langevin rate equation is derived. The equation is, in general, infinite order in d/dt constituting an infinite-order correction to the low-frequency weak-feedback analysis. The general formalism includes relaxation oscillations and permits analysis of the effect of feedback on the laser linewidth, frequency noise, relative intensity noise, and the relaxation oscillation sidebands in the field spectrum. The theory is applied to two important feedback configurations: the laser coupled to a single mirror and the laser coupled to a high-Q cavity.<>

Published in:

Quantum Electronics, IEEE Journal of  (Volume:27 ,  Issue: 3 )