Author Affiliations
Abstract
1 SwissFEL, Paul Scherrer Institute, Villigen PSI, Switzerland
2 Photonics Institute, Technische Universität Wien, Vienna, Austria
3 Institute of Applied Physics, University of Bern, Bern, Switzerland
4 Institute for Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland
We demonstrate the generation, spectral broadening and post-compression of second harmonic pulses using a thin beta barium borate (BBO) crystal on a fused-silica substrate as the nonlinear interaction medium. By combining second harmonic generation in the BBO crystal with self-phase modulation in the fused-silica substrate, we efficiently generate millijoule-level broadband violet pulses from a single optical component. The second harmonic spectrum covers a range from long wave ultraviolet (down to 310 nm) to visible (up to 550 nm) with a bandwidth of 65 nm. Subsequently, we compress the second harmonic beam to a duration of 4.8 fs with a pulse energy of 0.64 mJ (5 fs with a pulse energy of 1.05 mJ) using chirped mirrors. The all-solid free-space apparatus is compact, robust and pulse energy scalable, making it highly advantageous for generating intense second harmonic pulses from near-infrared femtosecond lasers in the sub-5 fs regime.
post-compression second harmonic generation self-phase modulation supercontinuum generation High Power Laser Science and Engineering
2024, 12(2): 02000e16
Author Affiliations
Abstract
1 SwissFEL, Paul Scherrer Institute, 5232 Villigen, Switzerland
2 Institute for Quantum Electronics, Physics Department, ETH Zurich, 8093 Zurich, Switzerland
We report on compact and robust supercontinuum generation and post-compression using transmission of light through multiple thin solid plates at the SwissFEL X-ray free-electron laser facility. A single stage consisting of three thin plates followed by a chirped mirror compressor achieves compression of initially 30-fs pulses with 800-nm center wavelength to sub-10-fs duration. We also demonstrate a two-stage implementation to compress the pulses further to sub-5-fs duration. With the two-stage setup, the generated supercontinuum includes wavelengths ranging from 500 to 1100 nm. The multi-plate setup is compact, robust, and stable, which makes it ideal for applications at free-electron laser facilities such as pump-probe experiments and laser-arrival timing tools.
post-compression self-phase modulation supercontinuum generation High Power Laser Science and Engineering
2021, 9(4): 01000e66
Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
Using second-order autocorrelation conception, a novel method and instrument for accurately measuring interval between two linearly polarized ultrashort pulses with real time were presented. The experiment demonstrated that the measuring method and instrument were simple and accurate (the measurement error <5 fs). During measuring, there was no moving element resulting in dynamic measurement error.
230.0230 optical devices 120.4570 optical design of instruments 320.7100 ultrafast measurements Chinese Optics Letters
2005, 3(1): 0116
Author Affiliations
Abstract
Key Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
Phase-matched high-order harmonic generation in Ar gas-filled cell is investigated experimentally. We obtain phase-matched 27th order harmonic driven by a commercially available solid-state femtosecond laser system at 0.55 mJ/pulse energy level and 1-kHz repetition rate. Moreover, we find that the spatial distribution of intensity of high-order harmonics is flat-top profile other than a Gaussian one under the condition of optimized conversion efficiency in the static gas cell.
190.4160 multiharmonic generation 140.7240 UV XUV and X-ray lasers Chinese Optics Letters
2004, 2(6): 06347
