Abstract

We experimentally study filamentation and supercontinuum generation in bulk silicon crystal using femtosecond mid-infrared pulses with carrier wavelengths in the range of 3.25–4.7 μm, in the presence of three-, four-, and five-photon absorption. Spectral measurements show a fairly stable blueshifted cutoff in the 2.5–2.7 μm range and gradual increase of the long-wave extent with increasing wavelength of the incident pulses, eventually yielding an octave-spanning supercontinuum, covering the wavelength range from 2.5 to 5.8 μm with the input pulses at 4.7 μm. The recorded spatiotemporal intensity distributions of a single filament revealed pulse splitting after the nonlinear focus, in line with the pulse-splitting-based filamentation scenario inherent to normally dispersive dielectric nonlinear media.

© 2019 Optical Society of America

Three-octave-spanning supercontinuum generation and sub-two-cycle self-compression of mid-infrared filaments in dielectrics

Houkun Liang, Peter Krogen, Ross Grynko, Ondrej Novak, Chun-Lin Chang, Gregory J. Stein, Darshana Weerawarne, Bonggu Shim, Franz X. Kärtner, and Kyung-Han Hong
Opt. Lett. 40(6) 1069-1072 (2015)

Broadband conical third harmonic generation in femtosecond filament-modified fused silica

Robertas Grigutis, Vytautas Jukna, Gintaras Tamošauskas, and Audrius Dubietis
Opt. Lett. 48(2) 506-509 (2023)

Taming femtosecond laser filamentation and supercontinuum generation in liquids using neural networks

Panagiotis Konstantakis, Paul E. Dufour, Maria Manousidaki, Anastasios D. Koulouklidis, and Stelios Tzortzakis
Opt. Lett. 47(21) 5445-5448 (2022)

Laser ellipticity-dependent supercontinuum generation by femtosecond laser filamentation in air

Na Chen, Tie-Jun Wang, Zhongbin Zhu, Hao Guo, Yaoxiang Liu, Fukang Yin, Haiyi Sun, Yuxin Leng, and Ruxin Li
Opt. Lett. 45(16) 4444-4447 (2020)

Low-threshold supercontinuum generation in a homogeneous bulk material at 76 MHz pulse repetition rate

Vaida Marčiulionytė, Jonas Banys, Julius Vengelis, Robertas Grigutis, Gintaras Tamošauskas, and Audrius Dubietis
Opt. Lett. 48(17) 4609-4612 (2023)