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Eigenpolarization theory of monolithic nonplanar ring oscillators

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3 Author(s)
Nilsson, A.C. ; Edward L. Ginzton Lab., Stanford Univ., CA, USA ; Gustafson, E.K. ; Byer, R.L.

Diode-laser-pumped monolithic nonplanar ring oscillators (NPROs) in a applied magnetic field can operate as unidirectional traveling-wave lasers. The diode laser pumping, monolithic construction, and unidirectional oscillation lead to narrow linewidth radiation. Here, a comprehensive theory of the eigenpolarizations of a monolithic NPRO is presented. It is shown how the properties of the integral optical diode that forces unidirectional operation depend on the choice of the gain medium, the applied magnetic field, the output coupler, and the geometry of the nonplanar ring light path. Using optical equivalence theorems to gain insight into the polarization characteristics of the NPRO, a strategy for designing NPROs with low thresholds and large loss nonreciprocities is given. An analysis of the eigenpolarizations for one such NPRO is presented, alternative optimization approaches are considered, and the prospects for further reducing the linewidths of these lasers are briefly discussed.<>

Published in:

Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 4 )