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Proceedings Paper

Convenient scheme for efficient generation of mid-infrared CEP-stabilized femtosecond pulses using 1030-nm source (Conference Presentation)
Author(s): Michał Nejbauer; Marcin Pastorczak; Tomasz Kardaś; Yuriy Stepanenko; Czesław Radzewicz

Paper Abstract

Here we propose a simple and effective system for conversion of 200-fs, 1030 nm pulses into few-optical-cycles pulses in the 3-6 um spectral range. The scheme works as follows. Small part of pump radiation is converted into supercontinuum and the radiation from the 700-900 nm spectral range is used as a seed in the first OPA. The remaining pump beam passes through a BBO crystal which converts less than 3% of the pulse energy into the second harmonic (515 nm). The green beam is used as a pump in first OPA based on 1 mm-think BBO crystal. Collinear geometry is used to generate idler pulses in the 1.2-1.6 um range without angular chirp. The idler beam is then used as a seed in the second collinear OPA, which is pumped by the unconverted 1030 nm beam. The resulting idler pulses in 3-6 um range are slightly chirped depending on the crystal used (LGS, GS, AGS, LiIO3) and are compressed in the bulk material (silicon or germanium). Such scheme provides a passive stabilization of the carrier-to-envelope phase of the resulting pulses. Because of the lower group velocity mismatch (GVM) between interacting pulses in nonlinear infrared crystals, as compared to Ti:sapphire based pump lasers, bandwidths supporting few-optical-cycles pulses in the 3-6 um spectral range are easily obtained. In the experiment we have used 200 uJ pulses (1030 nm) at repetition rate 1-10 kHz and the total quantum conversion efficiency 25-35% was reached. The resulting mid-infrared pulses were fully characterized.

Paper Details

Date Published: 14 March 2018
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Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 105160B (14 March 2018); doi: 10.1117/12.2291468
Show Author Affiliations
Michał Nejbauer, Warsaw Univ. (Poland)
Marcin Pastorczak, Warsaw Univ. (Poland)
Tomasz Kardaś, Institute of Physical Chemistry (Poland)
Yuriy Stepanenko, Institute of Physical Chemistry (Poland)
Czesław Radzewicz, Warsaw Univ. (Poland)


Published in SPIE Proceedings Vol. 10516:
Nonlinear Frequency Generation and Conversion: Materials and Devices XVII
Konstantin L. Vodopyanov; Kenneth L. Schepler, Editor(s)

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