A source of THz radiation with electric field strength of more than 1 MV cm−1 on the basis of 100-Hz femtosecond Cr : forsterite laser system. (June 2018)

• Record Type: Journal Article
• Authors: Ovchinnikov, A.V.; Chefonov, O.V.; Sitnikov, D.S.; Il'ina, I.V.; Ashitkov, S.I.; Agranat, M.B.
• Is Part Of: Quantum electronics. Volume 48:Number 6(2018)
• Page Start: 554
• Page End: 558
• Publication Date: 2018-06
• Subjects: multipass amplifier -- femtosecond laser pulse -- optical rectification -- terahertz radiation; Quantum electronics -- Periodicals; 537.5
• DOI: 10.1070/QEL16681
• Languages: English
• ISSNs: 1063-7818

Abstract

Abstract: A source of terahertz (THz) radiation with a bandwidth of 0.5 – 2.5 THz and a pulse repetition rate of 100 Hz has been developed. The THz generation is based on optical rectification of femtosecond pulses (generated by a Cr : forsterite laser system) in a nonlinear organic crystal OH1. An optical scheme of a multipass amplifier for the Cr : forsterite laser system is developed to increase the pulse energy to 2.2 mJ. The conversion efficiency for pump laser radiation at a wavelength of 1.24 μm into THz radiation is found to be to 2 %. An electric field strength of 3.5 MV cm −1 is attained when focusing a THz beam into a near diffraction-limited spot.