Article
Physics, Multidisciplinary
Tobias Heldt, Jonathan Dubois, Paul Birk, Gergana D. Borisova, Gabriel M. Lando, Christian Ott, Thomas Pfeifer
Summary: Laser-driven recollision physics is typically limited to high field intensities, but using extreme ultraviolet and near-infrared pulses allows for studying recollision dynamics at a broad range of intensities. Transient absorption spectroscopy and time-dependent dipole moment reconstruction are used to analyze recollision dynamics. The comparison of linear and circular near-infrared polarization reveals the existence of recolliding periodic orbits.
PHYSICAL REVIEW LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Huiran Yang, Xupeng Li, Mengting Qi, Jiawei Cheng, Lu Li
Summary: In this study, passively harmonic mode locking of an erbium-doped fiber laser using a TaSe2 nanosheets saturable absorber (SA) is demonstrated. The harmonic mode-locking operation is achieved by adjusting the polarization controller and power. The results confirm the potential of TaSe2 as an ideal photonic material.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Optics
Jovan Jovanovic, Ronald Fernando Garcia Ruiz
Summary: Colinear laser spectroscopy of fast atomic beams is a useful tool for precision experiments, but the spectral resolution is typically limited. This study explores the use of transient interference phenomena to improve the resolution. By providing a satisfactory description of previously observed line shapes and proposing alternative experimental schemes, the resolution in fast ion-beam experiments can potentially be enhanced.
Article
Optics
Zhenghu Chang, Lingdi Kong, Yulong Cao, Ai Liu, Ziwei Li, Qiang Wu, Jingsheng Huang, Lei Gao, Tao Zhu
Summary: The collapse and rebuilding dynamics of short-range bound states under continuous wave optical injection are investigated. The continuous wave laser perturbs the gain dynamics of the bound states, leading to frequent collapse and rebuilding of the bound states. Two different dynamics are observed, and stable bound states appear after rebuilding.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Xiaohui Ma, Zhengxiong Zhang, Wenhui Jiang, Liang Tong, Shaoqing Liu, Wenwen Dai, Wu Chen, Yong Zhou, Wei Zhang, Jihong Qiu, Meisong Liao, Weiqing Gao
Summary: In this study, tin selenide nanoparticles were utilized as a saturable absorber in a passively mode-locked thulium-doped fiber laser for the first time, producing mode-locked pulses with excellent performance. The results demonstrate the wide potential applications of tin selenide in ultrafast photonics in the mid-infrared waveband.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Dongmei Huang, Feng Li, Hongjie Chen, Yujia Li, Zihao Cheng, P. K. A. Wai
Summary: In this paper, a discrete Fourier domain mode locked (FDML) laser is proposed and demonstrated, which can simultaneously generate multiple combinations of comb lines using temporal modulation. It has various applications including dual modal swept source OCT and interleaved line scanning in swept source LiDAR.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Jingwei Ling, Jeremy Staffa, Heming Wang, Boqiang Shen, Lin Chang, Usman A. Javid, Lue Wu, Zhiquan Yuan, Raymond Lopez-Rios, Mingxiao Li, Yang He, Bohan Li, John E. Bowers, Kerry J. Vahala, Qiang Lin
Summary: Researchers have demonstrated a system-on-chip that emits high-coherence near-visible lightwaves. The chip combines wavelength conversion with self-injection locking within a single nonlinear resonator, providing a short-term linewidth of around 4.7 kHz and on-chip optical power over 2 mW. Heterogeneous integration shows conversion efficiency higher than 25% and output power over 11 mW. This approach can be scaled for low-cost manufacturing of high-coherence visible emitters and can be applied to other frequency conversion processes.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Karol Krzempek, Piotr Jaworski, Piotr Bojes, Pawel Koziol
Summary: A novel photothermal gas sensor configuration is demonstrated in this work. By analyzing the phase shift of the self-heterodyne beatnote signal of a mode-locked laser, the gas refractive index modulation caused by an auxiliary laser excitation is efficiently detected. IQ demodulation combined with Wavelength Modulation Spectroscopy-based signal analysis is used to optimize and simplify spectroscopic data acquisition and analysis. A proof-of-concept experiment for carbon dioxide detection at 2 µm wavelength shows a noise equivalent absorption of 2.25×10^(-7) for 1000 s integration time. The proposed sensor configuration is versatile and can be used to probe any gas molecule with the appropriate excitation source to induce the photothermal effect.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Li-Yen Tsai, Zhen-Ying Li, Ja-Hon Lin, Yu-Feng Song, Han Zhang
Summary: The study demonstrated a continuous wavelength tunable passively mode-locked Er-doped fiber laser from C-band to L-band using graphene oxide nanoplatelets and the nonlinear polarization rotation mechanism. The wavelength tuning was achieved through an invisible filter by means of an in-line polarizer inside the laser cavity, showing stable operation and promising commercial applications.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Junjie Zeng, Michelle Y. Sander
Summary: This study experimentally characterizes the dynamics of soliton explosions in a thulium-doped linear fiber laser, including transient chaotic states between single and double pulsing states, as well as periodic explosions induced by soliton collisions in a dual wavelength soliton state. These explosions are characterized with real-time measurements based on a modified time-stretched dispersive Fourier transform method relying on second-harmonic generation.
Article
Optics
Lu-Lu Zhang, Lu-Feng Xu, Yun-Feng Wu, Jin-Rong Tian, Yan-Rong Song
Summary: We demonstrated a harmonic mode-locked erbium-doped fiber laser using a saturable absorber of 2H-MoTe2, a member of transition metal dichalcogenides. The experimental results validate the feasibility of 2H-MoTe2 as a promising saturable absorber for generating ultrashort pulses with high repetition rates.
LASER PHYSICS LETTERS
(2022)
Article
Optics
Bihui Zhuang, Lingling Hua, Jinrong Tian, Peng Zhang, Yanrong Song
Summary: We presented a repetition-rate-tunable second harmonic mode-locked optically pumped semiconductor disk laser (OP-SDL) with a tuning range from 1.168 GHz to 1.25 GHz. The tuning process was continuous, and the OP-SDL remained in a mode-locked working state. This is the first work to achieve intracavity repetition rate tunable second harmonic laser in an OP-SDL. Simultaneously, the repetition rate of the fundamental wave can be continuously adjusted from 1.16 GHz to 1.66 GHz. The pulse trains had a central wavelength around 971 nm, and the highest repetition rate signal-to-noise ratio was over 60 dB, indicating the stability of the mode-locked pulses.
LASER PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Chao Luo, Guoqing Pu, Weisheng Hu, Lilin Yi
Summary: This paper proposes a pre-stretch technique to apply the real-time automatic mode-locking technique to mode-locked lasers with high repetition rates. The correlation between the repetition rate and the optimum amount of dispersion is well discussed through experiments.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Yuqing Guo, Jie Chen, Lingzhen Yang, Qi Jiang, Juanfen Wang, Pingping Xue, Xiaoyu Wang, Wanfeng Xiang
Summary: This study experimentally investigates the transition dynamics between 2nd and 3rd harmonic mode-locking states in a hybrid mode-locked fiber laser using dispersive Fourier transform technology. By adjusting the intracavity-loss-dependent gain profile and spectral filtering effect, induced soliton dynamics are observed before soliton splitting. During the reverse decay process of harmonic mode-locking order, solitons exhibit similar oscillation behaviors until one of them disappears. A significant wavelength shift phenomenon is observed in the transition process of harmonic orders. The numerical results and experimental findings both demonstrate the important role of intracavity spectral filtering effects in the harmonic order transition dynamics process.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
D. A. Korobko, P. A. Itrin, V. A. Ribenek, D. A. Stoliarov, A. A. Fotiadi
Summary: We conducted experimental studies on a SESAM mode-locked Er-doped fiber laser spliced from polarization-maintaining fiber components. By aligning the fiber mode spot to the SESAM, the laser achieved harmonic mode-locking (HML) across a wide range of pump powers with low supermode suppression level (SSL). Importantly, the HML laser produced pulses with linear polarization state and high pulse repetition rate (PRR). Optical injection of continuous wave (CW) into the laser cavity improved stability, increased SSL, and expanded the range of pump powers and maximal laser PRR available in HML regime.
OPTICS AND LASER TECHNOLOGY
(2023)
