Phase matching limitation of high-efficiency second-harmonic generation in both phase- and group-velocity-matched structures

Han, Wei; Zheng, Wanguo; Yang, Yuexiang; Cao, Dingxiang; Zhu, Qihua; Qian, Liejia

doi:10.1016/j.ijleo.2006.07.006

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…In the plane-wave approximation, the phase matching tuning curve is a function of the wave vector mismatch and the crystal length, as shown in figure (8 C), which has FWHM and wings structure that depend on the input intensity [29]. In the case, where the central spectral component enters the crystal at the perfect phase matching angle, ∆k is a function of θ λ .…”

Section: I5 the Dependence Of The Spectral And The Temporal Profiles ...mentioning

confidence: 99%

Comprehensive Numerical Modelling of a Low-Gain Optical Parametric Amplifier as a Front-End Contrast Enhancement Unit

Sharba,

Nersisyan,

Zepf

et al. 2016

Preprint

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We present a comprehensive model for predicting the full performance of a second harmonic generationoptical 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, the spectral content, the pump depletion, and the length of the nonlinear crystals. We monitor the influence of the initial parameters of the input pulse and the interdependence of the two related non-linear processes on the performance of the system and show its optimum configuration. The influence of the initial beam divergence on the spectral and the temporal characteristics of the generated pulse is discussed. In addition, we show that using a crystal slightly longer than the optimum length and introducing small delay between the seed and the pump ensures maximum efficiency and compensates for the spectral shift in the optical parametric amplification stage in case of chirped input pulse. As an example, calculations for bandwidth transform limited and chirped pulses of sub-picosecond duration in beta barium borate crystal are presented.

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Section: I5 the Dependence Of The Spectral And The Temporal Profiles ...mentioning

confidence: 99%