Abstract
The mode-locking techniques by noninertial nonresonant nonlinearities for cw solid- state lasers capable of generating subpico-second and femtosecond pulses has become widely recognized in the last time. Besides of the third-order optical nonlinearity,1,2 the second-order nonlinearity responsible for second harmonic generation (SHG) offers wide possibilities for the ultrashort pulse generation.3 The modulator consisted of the SHG crystal and dichroic mirror acts like a saturable absorber when properly adjusted.
© 1994 Optical Society of America
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