Article
Optics
Henning Stark, Joachim Buldt, Michael Mueller, Arno Klenke, Jens Limpert
Summary: The research introduces an ultrafast fiber chirped-pulse amplification laser system based on 16 ytterbium-doped rod-type amplifiers, capable of generating high-energy, short-pulse lasers. By implementing helium protection and a two-stage chirped-pulse amplification method, the beam quality is maintained close to the diffraction limit.
Article
Optics
Junho Shin, Hyun Woo Kim, In Hyung Baek, Sunjeong Park, Hyeon Sang Bark, Key Young Oang, Kyu-Ha Jang, Kitae Lee, Fabian Rotermund, Young Uk Jeong, Jungwon Kim
Summary: The study demonstrates a comprehensive timing synchronization method based on optical-radiofrequency synchronization and THz streaking to maintain sub-10-fs long-term timing stability for radiofrequency-gun-based MeV-level UED.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Yifan Liang, Zhuoyuan Liu, Qili Tian, Tong Li, Xiancai Lin, Lixin Yan, Yingchao Du, Renkai Li, Jiaru Shi, Cheng Cheng, Wenhui Huang, Chuanxiang Tang
Summary: Researchers have successfully generated electron bunch trains with adjustable modulation frequencies between 1 and 10 THz by converting the energy modulation induced by nonlinear longitudinal space charge force to a density modulation. These electron bunch trains can be used to directly produce tunable high-power narrowband terahertz radiation that fully covers the long-standing terahertz gap, opening up more possibilities in terahertz science.
Article
Optics
Lukas Bruder, Lukas Wittenbecher, Pavel Kolesnichenko, Donatas Zigmantas
Summary: The study combines achromatic second harmonic generation and adaptive pulse compression to efficiently generate sub-10 fs deep ultraviolet laser pulses at a laser repetition rate of 200 kHz. The simplified pulse compression scheme achieves pulse durations of approximately 10 fs without the use of adaptive optics, enabling straightforward tuning, broad pulse spectra, excellent stability, and high robustness against misalignment.
Article
Physics, Multidisciplinary
Heyan Liu, Tingting Yang, Jia Xu, Qing Wang, Hongwen Xuan, Jinwei Zhang
Summary: This paper reports on a high-repetition-rate ultrafast laser oscillator with high average power and short pulse duration, which provides an excellent source for generating optical frequency combs.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
Xiaoyue Zhou, Yuchen Lin, Yi Chan, Fu Deng, Jingdi Zhang
Summary: This article reports on a proof-of-principle experiment that generates carrier-envelope phase (CEP)-controllable and frequency-tunable narrowband terahertz (THz) radiation from an air-plasma filament using the beat of a temporally stretched two-color laser pulse sequence. The pulse sequence was prepared by passing the ultrafast laser pulse through a grating stretcher and Michelson interferometer with adjustable inter-arm delay. By partially frequency-doubling and focusing the pulse sequence, an air-plasma filament emitting a THz wave with desired pulse characteristics (center frequency and CEP) was created under coherent control. Numerical simulations were performed to replicate the experimental results and elucidate the complex nonlinear light-matter interaction. This work demonstrates the feasibility of generating coherently controlled narrowband THz waves with high tunability in laser-induced air plasma.
Article
Optics
G. E. Rizaev, L. V. Seleznev, I. A. Nikolaeva, D. E. Shipilo, N. A. Panov, D. V. Pushkarev, D. V. Mukrousova, A. A. Ionin, O. G. Kosareva
Summary: The terahertz radiation emitted by a biased air-based femtosecond filament has a different shape and frequency spectrum compared to the unbiased single-color and two-color schemes. The on-axis THz angular distribution at 0.5-1 THz transforms from a flat-top to a ring-shaped one at 10 THz when generated by a 15-kV/cm-biased filament in air produced by a 740-nm, 1.8-mJ, 90-fs pulse.
Article
Physics, Applied
Eiichi Matsubara, Masaya Nagai, Masaaki Ashida
Summary: Using a biased single crystal of diamond as a nonlinear medium, ultrabroadband infrared pulses generated through two-color pumped air plasma were coherently detected in a spectral range of 1-100 THz. The sensitivity was increased significantly compared to traditional air detection methods, even at higher probe pulse energy levels.
APPLIED PHYSICS EXPRESS
(2021)
Article
Multidisciplinary Sciences
Vyacheslav A. Trofimov, Dmitry M. Kharitonov, Mikhail Fedotov
Summary: This study proposes a new effective tool for three times decreasing frequency of the incident pulse based on three-waves interaction. The process possesses two stable modes and the conversion efficiency can reach about 70% or almost 100% depending on the intensity of the low frequency wave.
Article
Optics
Niloufar Nilforoushan, Thibault Apretna, Chao Song, Thomas Boulier, Jerome Tignon, Sukhdeep Dhillon, Marc Hanna, Juliette Mangeney
Summary: We present a tabletop source that delivers ultra-broadband THz pulses with high electric field strengths and high repetition rates. The source utilizes optical rectification and nonlinear temporal compression to generate THz pulses with different frequency spectra by using crystals of different thicknesses. The essential features of the emitted THz pulse spectra are well captured by simulations of the optical rectification process. This ultrafast laser-based source meets the important requirements for nonlinear THz experiments, allowing for high signal-to-noise ratio nonlinear time-resolved THz experiments.
Correction
Optics
L. U. K. A. S. BRUDER, L. U. K. A. S. WITTENBECHER, P. A. V. E. L. V. KOLESNICHENKO, D. O. N. A. T. A. S. ZIGMANTAS
Summary: This paper presents an erratum regarding the calculated phase matching bandwidths for achromatic second harmonic generation as presented in our previous paper [Opt. Express 29, 25593 (2021)].
Article
Optics
Umit Demirbas, Jelto Thesinga, Martin Kellert, Simon Reuter, Bernd Sumpf, Mikhail Pergament, Franz X. Kaertner
Summary: This study reports the first mode-locking results of a Cr:LiSAF laser near the 1 µm region, using a SESAM for mode-locking and generating high-quality sub-200 fs pulses. The pulse characteristics were further improved through dispersion optimization and wavelength tuning.
Article
Physics, Multidisciplinary
Shuai Wang, Jiawei Guo, Xinkui He, Yueying Liang, Baichuan Xie, Shiyang Zhong, Hao Teng, Zhiyi Wei
Summary: By comparing the high harmonic spectra of solids generated by laser pulses with varying durations, we found that lasers with good dispersion compensation can produce a broad spectrum of high harmonics. As the pulse duration is further compressed, several interference peaks appear in the broad spectrum. Moreover, simulations using the semiconductor Bloch equation, considering the effect of Berry curvature, were conducted to better understand this process. Our work provides a valuable approach for studying HHG by few-cycle laser pulses in solid materials, expanding the application of HHG in attosecond physics.
Article
Optics
Qiandong Ran, Hao Li, QiJie Wang, Ying Zhang
Summary: This paper systematically investigates the effects of higher-order dispersion on the self-compression process of pulses and discovers a stable and reliable rule to maintain the pulse duration close to the limit.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Instruments & Instrumentation
Baichuan Lin, Qi Song, Dongqing Pang, Bowen Liu, Weipeng Kong, Zeyu Li, Yu Qin, Minglie Hu
Summary: This paper explores the phase transition induced by fs laser in normal grade single crystal diamond plates, demonstrating that the optical and electrical properties of the irradiated region correlate with the degree of phase transition. Gratings can be fabricated on the surface and inside of the diamond plates, showing potential as terahertz polarizers. Additionally, electric wires can be created on the surface of the diamond plates.
INFRARED PHYSICS & TECHNOLOGY
(2021)
