Author Affiliations
Abstract
1 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Pulses as short as 8.1 fs were generated from a blue laser-diode-pumped Kerr-lens mode-locked Ti:sapphire oscillator, with an average power of 27 mW and a repetition rate of 120.6 MHz. The full width at half-maximum exceeds 146 nm, benefitting from the dispersion management by a combination of a low-dispersion fused silica prism pair and a series of double-chirped mirrors. To the best of our knowledge, this is the first time to generate sub-10-fs pulses from a laser diode directly pumped Ti:sapphire oscillator.
diode-pumped lasers titanium mode-locked lasers Chinese Optics Letters
2020, 18(7): 071402
Author Affiliations
Abstract
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Songshan Lake Materials Laboratory, Dongguan 523808, China
4 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
We demonstrate a harmonically pumped femtosecond optical parametric oscillator (OPO) laser using a frequency-doubled mode-locked Yb:KGW laser at a repetition rate of 75.5 MHz as the pump laser. Based on a bismuth borate nonlinear crystal, repetition rates up to 1.13 GHz are realized, which is 15 times that of the pump laser. The signal wavelength is tunable from 700 nm to 887 nm. The maximum power of the signal is 207 mW at the central wavelength of 750 nm and the shortest pulse duration is 117 fs at 780 nm. The beam quality (M2 factor) in the horizontal and vertical directions of the output beam are 1.077 and 1.141, respectively.
GHz femtosecond laser optical parametric oscillator tunable wavelength Chinese Optics Letters
2020, 18(3): 033201
1 中国科学院物理研究所北京凝聚态物理国家研究中心, 北京 100190
2 中国科学院大学, 北京 100049
随着超快激光脉冲宽度不断变窄,进一步产生单周期乃至亚周期的脉冲面临着巨大的技术挑战。通过脉冲载波包络相位精密控制技术相干合成多路超快光场,不仅是目前超快光学的重要前沿内容,也是实现亚周期脉冲极为有效的方案。结合本课题组近年来在相干合成方面的研究进展,介绍相干合成超快光场的主要技术内容,包括超宽带光谱的产生、色散管理及载波包络相位控制等技术。
物理光学 超快光学 超快激光脉冲 相干合成 亚周期 超连续光谱
1 中国科学院物理研究所 北京凝聚态物理国家研究中心, 北京 100190
2 中国科学院大学, 北京 100049
3 西安电子科技大学 物理与光电工程学院, 西安 710126
研制了高稳定Nd∶YVO4皮秒激光振荡器, 并在15 W、808 nm激光泵浦下得到6 W的连续锁模皮秒激光输出, 光-光效率为40%.对该皮秒激光进行单通放大后得到14 W的基频光输出, 倍频后可以得到7 W的532 nm皮秒激光, 用作钛宝石振荡器的泵浦源.在4.5 W的皮秒532 nm激光泵浦下, 结合腔外压缩, 得到了脉宽为9.4 fs、平均功率为150 mW的脉冲序列输出.调节钛宝石振荡器的腔长使其与皮秒振荡器的腔长一致时, 可实现自触发克尔透镜锁模.实验结果表明皮秒激光泵浦可以有效地触发钛宝石激光器的自动锁模, 输出飞秒脉冲序列.
超快激光 皮秒激光振荡器 钛宝石飞秒激光器 克尔透镜锁模 Ultrafast laser Picosecond laser oscillator Ti∶sapphire femtosecond oscillator Kerr-lens modelocking
Author Affiliations
Abstract
1 State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3 Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Materials in the transition metal dichalcogenide family, including WS2, MoS2, WSe2, and MoSe2, etc., have captured a substantial amount of attention due to their remarkable nonlinearities and optoelectronic properties. Compared with WS2 and MoS2, the monolayered MoTe2 owns a smaller direct bandgap of 1.1 eV. It is beneficial for the applications in broadband absorption. In this letter, using the magnetron sputtering technique, MoTe2 is deposited on the surface of the tapered fiber to be assembled into the saturable absorber. We first implement the MoTe2-based Q-switched fiber laser operating at the wavelength of 1559 nm. The minimum pulse duration and signal-to-noise ratio are 677 ns and 63 dB, respectively. Moreover, the output power of 25 mW is impressive compared with previous work. We believe that MoTe2 is a promising 2D material for ultrafast photonic devices in the high-power Q-switched fiber lasers.
160.4330 Nonlinear optical materials 140.3540 Lasers, Q-switched Chinese Optics Letters
2018, 16(2): 020007
