Excess-noise dependence on intracavity aperture shape.
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.
Karman
G P
GP
Philips Research Laboratories, Prof Holstlaan 4, 5656 AA Eindhoven, The Netherlands. gerwin.karman@philips.com
McDonald
G S
GS
Woerdman
J P
JP
New
G H
GH