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Published on: November 30, 2012
Excess-noise dependence on intracavity aperture shape
G P Karman1, G S McDonald, J P Woerdman
1Philips Research Laboratories, Prof Holstlaan 4, 5656 AA Eindhoven, The Netherlands. gerwin.karman@philips.com
Abstract:
In lasers with nonorthogonal eigenmodes the excess-noise factor K can be large, especially in unstable-cavity lasers with hard-edged intracavity apertures. To the best of our knowledge, we report the first detailed study of the dependence of K on aperture shape. Calculations and measurements of K for unstable-cavity lasers with variable-size apertures of triangular, square, pentagonal, hexagonal, octagonal, and rhomboid symmetries are summarized. It is shown that both the magnitude of K and its resonant behavior strongly depend on aperture shape and that many aspects of this dependence can be explained in terms of one-dimensional resonance lengths.
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