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The variation of the duration of the SHG pulses that are generated from input pulses of different spectral bandwidths all of 500 fs duration and intensity 5 GW/cm² as a function of the crystal length.
Source publication
We present a comprehensive model for predicting the full performance of a second harmonic generation-optical parametric amplification system that aims at enhancing the temporal contrast of laser pulses. The model simultaneously takes into account all the main parameters at play in the system such as the group velocity mismatch, the beam divergence,...
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Citations
... This configuration generally leads to the generation of an angularly dispersed idler beam due to the conservation of momentum. Although the bandwidth of the generated idler is relatively small, a non-collinear angle of a few degrees can result in significant spatial and temporal degradation in the generated pulse, see Ref. [13], Section 3.2.4, for more details. ...
... However, for pulses having relatively small bandwidth, none of these techniques are, in practice, the best solutions to the problem, due to the design complexity and associated losses. In such a system, using a crystal slightly shorter than the optimum length, which is defined by the intensity and the duration of the input pulse, limits the achievable conversion efficiency, while a crystal longer than the optimum length results in the generation of spatially and/or temporally degraded idler pulses, as discussed in [13]. In addition, when the input pulse is non-transform limited, the spectrum of the generated idler can be shifted from that of the input pulse, see for example, Fig. 12 in Ref. [13]. ...
... In such a system, using a crystal slightly shorter than the optimum length, which is defined by the intensity and the duration of the input pulse, limits the achievable conversion efficiency, while a crystal longer than the optimum length results in the generation of spatially and/or temporally degraded idler pulses, as discussed in [13]. In addition, when the input pulse is non-transform limited, the spectrum of the generated idler can be shifted from that of the input pulse, see for example, Fig. 12 in Ref. [13]. ...
The temporal contrast of a regeneratively amplified, sub-picosecond pulse is enhanced by employing a low-gain optical parametric amplification stage self-pumped by the second harmonic of the pulse. Through careful characterization of the two related nonlinear processes and optimization of the non-collinear geometry, a robust high-contrast idler pulse has been generated, with excellent spatial quality in both the near and far field. The overall energy conversion efficiency exceeds 14%, with 33% intensity conversion efficiency. The temporal cleaning is implemented without any bandwidth losses or spectral shift and produces approximately 20% temporal shortening. These experimental findings are in excellent agreement with numerical calculations.
