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Kilohertz gain-switched laser operation and femtosecond regenerative amplification in Cr:forsterite

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5 Author(s)
Shcheslavskiy, Vladislav ; Max-Born-Inst. for Nonlinear Opt. & Ultrafast Spectroscopy, Berlin, Germany ; Zhavoronkov, N. ; Petrov, V. ; Noack, F.
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We present a comprehensive study of the optimum operating regime in a gain-switched Cr:forsterite laser at a repetition frequency of 1 kHz with special attention to temperature-dependent and parasitic absorption effects and proper resonator design. On the basis of the results achieved, me demonstrate highly efficient (13% extraction efficiency) operation of a femtosecond regenerative amplifier based on Cr:forsterite and operating near room temperature with a novel BBO Pockels cell that is highly resistant to optical damage. Chirped pulse amplification raises the pulse energy to 355 μJ in ≈30 cavity round trips which corresponds to an amplification factor of ≈5.5×105. The nearly transform limited 200-μJ 135-fs compressed pulses near 1.25 μm have a peak power of ≈1.5 GW. Frequency doubling with 52% conversion efficiency in LBO produces femtosecond pulses of 104-μJ energy in the visible near 625 nm

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Quantum Electronics, IEEE Journal of  (Volume:35 ,  Issue: 8 )