Article
Optics
Yuliya Binhammer, Thomas Binhammer, Robin Mevert, Tino Lang, Angelika Ruck, Uwe Morgner
Summary: The report describes a high power, ultra-broadband, quickly tunable non-collinear parametric oscillator capable of delivering femtosecond pulses in two synchronized output beams. The device is ideal for spectroscopy or multi-color imaging applications, and preliminary results on two-color functional microscopy are presented.
Article
Optics
Tadas Bartulevicius, Mykolas Lipnickas, Virginija Petrauskiene, Karolis Madeikis, Andrejus Michailovas
Summary: This study demonstrates a versatile method for burst formation using the active fiber loop (AFL) and showcases the operation of an industrial-grade ultrafast laser system in both single-pulse and GHz-burst regimes, with varying pulse energies and durations.
Article
Physics, Multidisciplinary
Jinfang Yang, Chong Wang, Weijun Ling, Jingwen Xue, Xiaojuan Du, Wenting Wang, Yuxiang Zhao, Feiping Lu, Xiangbing Li, Jiajun Song, Zhaohua Wang, Zhiyi Wei
Summary: We present a high-power, widely tunable femtosecond MgO-doped periodically poled lithium niobate (MgO:PPLN) optical parametric oscillator (OPO) pumped by a Kerr-lens mode-locked Yb:KGW laser at a repetition rate of 151 MHz. The OPO can deliver up to 2.2 W of signal output centered around 1500 nm with a tunable signal spectrum range of 1377 nm-1730 nm, achieving an extraction efficiency of 31.4%. It exhibits excellent passive power stability of better than 0.71% rms over 4 hours. The idler tuning ranges from 2539 nm to 4191 nm, with a maximum idler bandwidth of 185 nm at 3613 nm. The shortest pulse duration of the signal is achieved at 170 fs at 1428 nm by compensating intracavity dispersion.
Article
Physics, Multidisciplinary
Zhonghai Zhang, Yuekai Zhao, Lin Chen, Zhihua Fang, Aiting Wu, Pengquan Zhang
Summary: A tunable low pass filter based on the tuning of input/output impedance is presented in this study. The filter consists of improved quarter-wavelength stubs, whose impedance can be adjusted within a certain range. By tuning the impedance, the cut-off frequency of the filter can be adjusted. Experimental results validate the effectiveness of the design method.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
Mikhail Roiz, Markku Vainio
Summary: This study proposes and demonstrates a versatile method for near- and mid-infrared optical frequency comb generation using multi-seeded femtosecond optical parametric generation, showing flexibility and adjustability.
Article
Optics
Robin Mevert, Yuliya Binhammer, Christian M. Dietrich, Luise Beichert, Jose R. Cardoso de Andrade, Thomas Binhammer, Jintao Fan, Uwe Morgner
Summary: This paper demonstrates a broadband, high-power, rapidly tunable femtosecond optical parametric oscillator with a wide signal tuning range and high output power.
PHOTONICS RESEARCH
(2021)
Article
Optics
L. Lang, C. P. Bauer, C. R. Phillips, U. Keller
Summary: This study presents a high power optical parametric oscillator (OPO) synchronously pumped by a modelocked 1030-nm thin-disk laser (TDL) oscillator, delivering an average power of 51.1 W with a pulse duration of 169 fs and a photon conversion efficiency of 47%. The OPO achieves the highest average power and shortest pulse duration among ultrafast OPOs, successfully adding wavelength tunability to high power Yb-based laser sources.
Article
Optics
Kan Tian, Weizhe Wang, Chunxiao Li, Zhongjun Wan, Bo Hu, Linzhen He, Maoxing Xiang, Jiyong Yao, Han Wu, Houkun Liang
Summary: In this study, we demonstrate the first tunable femtosecond mid-infrared (MIR) optical parametric amplifier (OPA) based on BaGa4Se7 (BGSe) crystal with an ultra-broadband spectral range. The OPA has a wide transparency range, high nonlinearity, and relatively large bandgap, enabling tunable output across an extremely wide spectral range from 3.7 to 17 μm.
Article
Optics
Biplob Nandy, S. Chaitanya Kumar, M. Ebrahim-Zadeh
Summary: This study demonstrates the generation of high-repetition-rate picosecond pulses in the 1.3-1.5 μm spectral range using an idler-resonant optical parametric oscillator based on MgO-doped periodically-poled LiNbO3. By optimizing the spatial quality of the idler beam and employing a second MgO:PPLN crystal with a fanout grating structure, spectral coverage across 1272-1515 nm and stable output power have been achieved.
Article
Optics
Jiaxing Heng, Rui Zhang, Mengke Qin, Zhaowei Zhang
Summary: We propose a singly resonant femtosecond optical parametric oscillator (OPO) cavity architecture that enables ultra-broadband wavelength tuning and efficient outcoupling of optical pulses. Experimental results show a tuning range of 652-1017nm and 1075-2289nm, spanning nearly 1.8 octaves, which is the widest resonant-wave tuning range obtained from a green-pumped OPO to date. The study highlights the importance of intracavity dispersion management for stable and single-band operation of a broadband wavelength tuning system. This architecture is versatile and can be extended to OPOs operating in various spectral regions.
Article
Engineering, Electrical & Electronic
Geyang Wang, Chuan Bai, Li Zheng, Xuan Tian, Haijing Mai, Yang Yu, Wenlong Tian, Zhiyi Wei, Jiangfeng Zhu
Summary: In this letter, a Yb:CaGdAlO4 crystal-based femtosecond regenerative amplifier with a repetition rate of 1 MHz is demonstrated. The amplifier delivers an average output power of 21.8 W with an absorbed pump power of 47.8 W before compression. The slope efficiency and the optical-to-optical efficiency, measured with respect to the absorbed pump power, are 54.9% and 45.6%, respectively. Upon using a grating-pair for compression, 168-fs pulses with pulse energy of 20 mu J and peak power of 105 MW are obtained. Benefiting from the good thermal management and the great optical-optical efficiency, the beam quality (M-2) on both axes is less than 1.2.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Wenlong Tian, Xuan Tian, Qian Li, Geyang Wang, Chuan Bai, Yang Yu, Xiaodong Xu, Jun Xu, Zhiyi Wei, Jiangfeng Zhu
Summary: We report the demonstration of a pure Kerr-lens modelocked Yb:CALYO laser with high average power and high-quality femtosecond pulses.
Article
Optics
GenYu Bi, Yuxi Chu, Meng Zhang, Minglie Hu
Summary: The study presents a compact femtosecond optical parametric oscillator with a tunable repetition rate, pumped harmonically at 52.5 MHz using a laser system. The multiplication of the repetition rate is achieved by placing a nonlinear crystal in a compact cavity, allowing for the highest repetition rate of 2.95 GHz with tunable central wavelength from 1383 to 1596 nm.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Yiheng Fan, Hao Xiu, Wei Lin, Xuewen Chen, Xu Hu, Wenlong Wang, Junpeng Wen, Hao Tian, Molei Hao, Chiyi Wei, Luyi Wang, Xiaoming Wei, Zhongmin Yang
Summary: In this study, a high-power, high-repetition-rate, all-fiber femtosecond laser system operating at 1.5 μm is presented. With a fundamental repetition rate of 10.6 GHz and an average output power of 106.4 W, this all-fiber laser system achieves the highest average power reported to date for a 1.5 μm all-fiber femtosecond laser. By utilizing soliton-effect-based pulse compression with optimized pre-chirping dispersion, the amplified pulses can be compressed to 239 fs. The study also explores the nonlinear interaction among transverse modes in fiber laser systems and identifies the intermodal modulational instability.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
Article
Optics
Miao Wang, Jian Ma, Tingting Lu, Shanjiang Hu, Xiaolei Zhu, Weibiao Chen
Summary: A single-resonant low-threshold type-I BBO optical parametric oscillator with tunable output has been achieved by using the noncollinear phase matching method. A continuously tuning output with a total spectral range of 220 nm was successfully obtained by adjusting the phase matching angle of the BBO crystal.
CHINESE OPTICS LETTERS
(2022)
