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The calculation of parametric amplification unit based on nonlinear borate crystals for multiterawatt femtosecond laser system has been carried out. A Gaussian gain profile with a ∼20% dip near the center is proposed to optimize the amplified signal spectral shape. Optimal parameters of the noncollinear type I BBO-based parametric amplifier were established.
We propose the model of the amplification of the transform-limited pulses in a homogeneously broadened medium. The model provides the information about the output characteristics of an unchirped pulse after passing through an active homogeneously broadened medium and about the population inversion inside the medium at any moment of time.
Recently, we demonstrated extremely low threshold optical parametric generation (OPG) pumping a CdSiP2 (CSP) crystal with 500-ps-long pulses from a Nd-laser system [1]. Diode laser seeding enabled narrow-band non-critical OPG operation at 1–10 kHz repetition rate with the idler at ∼6100 nm. In comparison to [2], with a simpler Q-switching based pump system, a 4-fold improvement of the time-bandwidth...
BiB3O6 (BIBO) crystal has been used for efficient second-harmonic generation (SHG) of a low-power femtosecond Er-fiber laser-amplifier system operating at 56 MHz. At the maximum input power of 65 mW, an internal conversion efficiency of 23% was achieved for SHG at 782 nm, with a pulse duration of 64 fs. A comparison with beta-BaB2O4 reveals superior properties of BIBO for such ultrashort-pulse ultra-broadband...
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