Abstract

We report here experimental results of perturbative nonlinear optical wave-mixing processes in the extreme ultraviolet region by using two-color and three-color laser fields. Besides the usual odd-harmonic spectrum of high harmonic generation, new spectral components are observed when multiple incommensurate lasers (one driving plus one or two control field) interact with neutral krypton gas. To demonstrate the wave-mixing process underlying such an observation, we first couple the driving field with either the signal or the idler field of an optical parametric amplifier in the gaseous ensemble to generate certain mixing frequencies. The two control fields are then simultaneously combined with the driving field to produce broad and distinguishable mixing peaks that clearly reveal the contribution of each control laser. Finally, the variation of the intensity of the mixing waves with the intensity of each control field, the gas density, and the relative focus position is examined for signatures of phase-matched generation of the mixing fields in this spectral region.

© 2019 Optical Society of America

Four-wave mixing of extreme ultraviolet pulses and infrared pulses for studies of atomic dynamics

Khuong Ba Dinh, Khoa Anh Tran, Peter Hannaford, and Lap Van Dao
J. Opt. Soc. Am. B 36(11) 3046-3052 (2019)

Tunable high-order frequency mixing for XUV transient absorption and photoelectron spectroscopies

Nathan Harkema, Alexander Plunkett, and Arvinder Sandhu
Opt. Express 27(21) 31053-31061 (2019)

Enhanced XUV harmonics generated in mixed noble gases using three-color laser fields

Ganjaboy S. Boltaev, Rashid A. Ganeev, and Ali S. Alnaser
Opt. Express 32(1) 113-124 (2024)

Enhanced high-harmonic generation up to the soft X-ray region driven by mid-infrared pulses mixed with their third harmonic

Tobias Kroh, Cheng Jin, Peter Krogen, Philip D. Keathley, Anne-Laure Calendron, Jonathas P. Siqueira, Houkun Liang, Edilson L. Falcão-Filho, C. D. Lin, Franz X. Kärtner, and Kyung-Han Hong
Opt. Express 26(13) 16955-16969 (2018)

Shaped multi-cycle two-color laser field for generating an intense isolated XUV pulse toward 100 attoseconds

Qingbin Zhang, Lixin He, Pengfei Lan, and Peixiang Lu
Opt. Express 22(11) 13213-13233 (2014)