Generation of Intense Near and Mid-Infrared Femtosecond Radiation (1.2–2.4 μm) with the Use of the Broadband Parametric Down-Conversion in a Type-II BBO Crystal Pumped by a Ti:Sapphire Laser and Its Application for the Generation of Terahertz Radiation in Organic Crystals

A two-stage optical parametric amplifier is fabricated on the basis of type-II BBO crystals pumped by the intense radiation of a Ti:sapphire laser. Femtosecond radiation tunable from the near to mid-infrared range at wavelengths of 1.1–1.6 μm (signal wave) and 1.6–2.6 μm (idler wave) is generated wi...

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Bibliographic Details
Published in:JETP letters 2022, Vol.115 (2), p.63-70
Main Authors: Suleimanova, D. Z., Zhidovtsev, N. A., Potemkin, F. V.
Format: Article
Language:English
Subjects:
Atomic
BBO crystals
Biological and Medical Physics
Biophysics
Broadband
Crystals
Energy conversion efficiency
Infrared radiation
Molecular
Optical and Plasma Physics
Optical pumping
Optics and Laser Physics
Organic crystals
Parametric amplifiers
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Sapphire
Solid State Physics
Spintronics
Tunable lasers
Wavelengths
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Description
Summary:A two-stage optical parametric amplifier is fabricated on the basis of type-II BBO crystals pumped by the intense radiation of a Ti:sapphire laser. Femtosecond radiation tunable from the near to mid-infrared range at wavelengths of 1.1–1.6 μm (signal wave) and 1.6–2.6 μm (idler wave) is generated with a total energy conversion efficiency of 8%. The output energy of generated infrared pulses at wavelengths of 1.3 and 2 μm is 840 and 280 μJ, respectively. It is experimentally demonstrated that terahertz radiation can be subsequently generated in a DAST organic crystal using the optical rectification process under the pumping by generated mid-infrared radiation. The developed model of the generation of terahertz radiation shows that the optical–terahertz conversion efficiency to 3.6% can be increased by chirping femtosecond mid-infrared radiation (~2 μm) to 200 fs.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364022020096