Abstract
This is a report on the mode-locking stability of a Kerr-lens mode-locked Ti:sapphire, measured by a newly developed noise measurement method. Mode-locking stability is monitored via a power spectrum, which is obtained by irradiating optical pulses onto a fast photodiode, and by processing the detected signal using a recently developed real-time spectrum analyzer. The mode-locking stability of the Ti:sapphire laser strongly depends on pump power and becomes unstable as pump power decreases from an optimum power level. Amplitude fluctuation and Q-switched mode-locking are notably observed as the main causes for a break in a continuous-wave (CW) mode-locking operation. Moreover, chaotic frequency hopping is observed in a Q-switched mode-locking operation. A real-time spectrum analyzer provides a time-varying power spectrum, which enables easy adjustment for stable CW mode-locking operation of ultra-fast solid state lasers.
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