Abstract
Synchronous pumping is a well-known technigue for the modelocking of lasers with fast relaxation times, which has recently received some renewed attention[1]. It locks the frequency of the pump to that of the signal and is particularly useful in ultra-fast pump- probe measurement techniques. However, due to the constraints on the relaxation time of the gain medium, it is very difficult to synchronously pump solid-state lasers. A noticeable exception has been demonstrated recently in a Nd:YAG laser, where it was claimed that a gain modulation as low as 10'4 can produce pulses in the ≈ 100 psec regime in a special reflection-free cavity[2]. However, in all cases an accurate control of the respective cavity lengths was required and synchronous pumping attributed only to gain-modulation effects.
© 1993 Optical Society of America
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