Abstract
Different APM laser schemes1 are popular for short-pulse generation. To avoid instability due to double-cavity configurations, new single-cavity laser schemes for self-starting mode locking have been proposed.2,3 The basic element of these lasers is a nonlinear active or passive fiber-loop interferometer. Mode locking is due to nonlinear loop reflection and transmission change when light power decreases or increases. The experimentally realized scheme,4 based on a two-coupler loop-in-the-ring interferometer,5 has a figure-eight form.3,4 This laser works only with an optical isolator. An analogous scheme without the isolator3 requires additional gain and nonlinear media.
© 1993 Optical Society of America
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