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Generation of extended pulse trains of minimum duration by passive negative feedback applied to solid-state Q-switched lasers

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9 Author(s)
Agnesi, A. ; Dept. of Electron., Pavai Univ., Italy ; Del Corno, A. ; Di Trapani, P. ; Fogliani, M.
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Intracavity self-focusing in a thin two-photon absorber acts, in combination with pinholes, as an efficient power and energy limiter in flashlamp (pulsed) and arc lamp (CW) pumped actively passively mode-locked crystalline Nd-doped lasers. Power limiting by the intracavity two-photon absorber is exploited to create the condition for optimum pulse compression in the saturable absorber. Additional pulse shortening is due to the elimination of the pulse tail by self-defocusing in the nonlinear crystal. Extracavity and intracavity measurements, as well as three-dimensional computer simulations, give a complete understanding of the pulse evolution in the cavity, including the two mechanisms of pulse shaping and compression

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Quantum Electronics, IEEE Journal of  (Volume:28 ,  Issue: 3 )