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Proceedings Paper

Shaping of picosecond laser pulses by second harmonic generation with time predelay
Author(s): Martin Duda; Ondřej Novák; Michał Chyła; Václav Kubeček; Martin Smrž; Tomáš Mocek
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Paper Abstract

Shaping and compression of short laser pulses in the course of a second harmonic (2H) generation is a well verified technique in the case of Nd:glass laser radiation converted in KTP crystal cut for type II phase-matching. The laser pulse, few ps in duration, is divided into two orthogonally polarized pulses and one is delayed in respect to the other. Both of them enter the nonlinear optical crystal, in which they propagate with different group velocities. As they are approaching each other, short 2H pulse is generated at their temporal overlap. Shaping of the 2H pulse is achieved by changing the predelay and input pulse intensities. For current high power picosecond laser sources of choice, Yb:YAG lasers, borate crystals have to be used for efficient harmonic generation because of their convenient thermal properties and long lifetime. Although the requirement on group velocities is not fulfilled for the LBO and BBO crystals, numerical calculations have revealed conditions where pulse shaping and even significant pulse compression occur. Fundamental input pulse of 1.8 ps was compressed down to 0.8 ps (FWHM) by 2H generation in LBO crystal. In this work, details about the calculations and measurements of shaping of 2H picosecond Yb:YAG laser pulses in LBO and BBO crystals in dependence on input intensities and predelay will be presented. The shaped 2H pulse measurements performed by an autocorrelator agree well with the calculations, achieving almost 3-fold compression. For the most interesting cases, 2H pulses are characterized by FROG in detail.

Paper Details

Date Published: 2 March 2020
PDF: 11 pages
Proc. SPIE 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX, 1126413 (2 March 2020); doi: 10.1117/12.2546153
Show Author Affiliations
Martin Duda, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Czech Technical Univ. in Prague (Czech Republic)
Ondřej Novák, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Michał Chyła, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Václav Kubeček, Czech Technical Univ. in Prague (Czech Republic)
Martin Smrž, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Tomáš Mocek, Institute of Physics of the CAS, v.v.i. (Czech Republic)


Published in SPIE Proceedings Vol. 11264:
Nonlinear Frequency Generation and Conversion: Materials and Devices XIX
Peter G. Schunemann; Kenneth L. Schepler, Editor(s)

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