Picosecond pulse contrast enhancement by use of polarization rotation in crystals with the second-order nonlinearity

Adamonis, Jonas; Antipenkov, Roman; Kolenda, J.; Michailovaś, Andrejus; Piskarskas, A.; Varanavičius, A.

doi:10.1007/s00340-011-4793-8

Cited by 1 publication

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“…The contrast of optical pulses in chirped pulse amplification (CPA) systems is limited by many factors, including amplified spontaneous emission (ASE) in lasers, non-compensated angular dispersion; parametric fluorescence in OPCPA systems, and reflection-induced seed post-pulses or pump noise. Several experimental techniques have been developed to enhance the temporal contrast in optical parametric amplification, and filters based on nonlinear elliptical polarization rotation [2] or on cross-polarized wave (XPW) generation [3] can be used efficiently. A combined amplification scheme is another approach to reach contrast enhancement.…”

Section: Introductionmentioning

confidence: 99%

Contrast degradation in OPCPA systems induced by a pump with a post-pulse

Pajer

Kalashnikov

2018

Laser Phys. Lett.

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A new mechanism that degrades the temporal contrast of pulses generated in optical parametric chirped-pulse amplification (OPCPA) systems is presented in this paper. Post-pulses exist in any laser system, including pump lasers. When a CPA scheme is used for pumping, a small-scale modulation of the pump signal may arise from the interference of a post-pulse with the main chirped pump pulse; the pre-pulses appear in the signal when the pump interacts with the signal, and following recompression. An OPCPA system was modelled using numerical methods to study this phenomenon. It is shown that several pre- and post-pulses appear in the signal after recompression, leading to contrast degradation. The contrast of the recompressed signal is proportional to the contrast of the pump, and depends on the time delay of the post-pulse. The temporal positions of the pre- and post-pulses are also affected by the pump parameters.

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Section: Introductionmentioning

confidence: 99%