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学者姓名：宋晏蓉
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Abstract ：
Spectral broadening is desirable in optical parametric oscillators (OPOs) for their tunability and generation of short pulses, which typically entails more complex systems and increased costs. Here, we report large-scale spectral broadening through the simple insertion of a MoTe2 film into the cavity of a femtosecond OPO for the first time. The OPO offers a tunable output ranging from 1245 to 1552 nm, and comparable broadening effects are observed in most of the operating wavelengths. The broadest spectrum is achieved at 1524 nm by inserting a low-concentration 1T ' -MoTe2 film, exhibiting a spectral broadening factor exceeding 22. Spectral broadening results in a time compression correspondingly. The narrowest pulse is obtained by using a low-concentration 2H-MoTe2 film with a pulse duration of 88 fs, and a temporal compression of 20 of pulse duration is obtained at 1417 nm. The experimental results show that the nonlinear properties and the film structure of MoTe2 induce a local modulation of the signal in the space-time domain, representing the main contribution to spectral broadening. This approach will offer new insights to enhance the practical application of 2D materials and benefit the development of OPO devices.
Keyword ：
two-dimensional materials two-dimensional materials spectralbroadening spectralbroadening optical parametric oscillators optical parametric oscillators nonlinear properties nonlinear properties MoTe2 film MoTe2 film
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| GB/T 7714 | Zhang, Zexin , Tian, Jinrong , Dong, Zikai et al. Large-Scale Spectral Broadening of Femtosecond Optical Parametric Oscillators by MoTe2 Films [J]. | ACS PHOTONICS , 2024 , 11 (3) : 1044-1050 . |
| MLA | Zhang, Zexin et al. "Large-Scale Spectral Broadening of Femtosecond Optical Parametric Oscillators by MoTe2 Films" . | ACS PHOTONICS 11 . 3 (2024) : 1044-1050 . |
| APA | Zhang, Zexin , Tian, Jinrong , Dong, Zikai , Liu, Haiyan , Wu, Yunfeng , Zhang, Chenhui et al. Large-Scale Spectral Broadening of Femtosecond Optical Parametric Oscillators by MoTe2 Films . | ACS PHOTONICS , 2024 , 11 (3) , 1044-1050 . |
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Abstract ：
Self-mode-locking (SML) of fundamental TEM00 mode and high-order transverse mode were demonstrated in an optically pumped semiconductor disk laser and these states can be switched by simply adjusting the elements of the laser. The repetition rate of the pulse train was 1 GHz, using a straight cavity. Furthermore, we measured the pulse durations and found that the pulse duration of SML pulse with higher-order transverse mode is shorter than that of fundamental mode at the same pump power. To the best of our knowledge, this is the first experiment to obtain two SML states in a single laser. By using the method of changing the cavity length and adjusting the angle of the output coupler, the repetition rate can be continuously tuned from 3 GHz to 3.2 GHz.
Keyword ：
self-mode-locking self-mode-locking switchable output switchable output OP-SDL OP-SDL
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| GB/T 7714 | Zhuang, Bihui , Hua, Lingling , Tian, Jinrong et al. Switching of several self-mode-locking states in an optically pumped semiconductor disk laser [J]. | LASER PHYSICS LETTERS , 2023 , 20 (11) . |
| MLA | Zhuang, Bihui et al. "Switching of several self-mode-locking states in an optically pumped semiconductor disk laser" . | LASER PHYSICS LETTERS 20 . 11 (2023) . |
| APA | Zhuang, Bihui , Hua, Lingling , Tian, Jinrong , Mao, Lin , Song, Yanrong . Switching of several self-mode-locking states in an optically pumped semiconductor disk laser . | LASER PHYSICS LETTERS , 2023 , 20 (11) . |
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Abstract ：
Strain-compensated quantum wells (QWs) could greatly improve the performance of semiconductor disk lasers, such as improving the epitaxy quality of the semiconductor gain chip and obtaining a higher gain. To optimize the output characteristics of the semiconductor gain chip, the strain-compensated thickness, well depth, band energy, emission wavelength, and peak gain versus In and P compositions are investigated in detail. The results show that increasing the P composition of the strain-compensated layer will slightly reduce the emission wavelength, deepen the well depth, and increase the peak gain. But the P composition is not the higher the better. When designing a gain chip, it should have a pre-offset between the emission wavelength of the QWs at room temperature and the target wavelength of the laser at an intense pump, and the pre-offset values of the wavelength should be designed deliberately to guarantee the resonant periodic gain structure working normally when the temperature in the active region approaches the desired value. This theoretical investigation may provide guidance for optimizing the laser performance of semiconductor disk lasers and other QW lasers.
Keyword ：
InGaAs InGaAs strain-compensated quantum well strain-compensated quantum well GaAsP GaAsP optically pumped semiconductor disk laser optically pumped semiconductor disk laser
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| GB/T 7714 | Hua, Ling-Ling , Zhuang, Bi-Hui , Mao, Lin et al. Optimization of the gain chip for optically pumped semiconductor disk lasers [J]. | LASER PHYSICS LETTERS , 2023 , 20 (2) . |
| MLA | Hua, Ling-Ling et al. "Optimization of the gain chip for optically pumped semiconductor disk lasers" . | LASER PHYSICS LETTERS 20 . 2 (2023) . |
| APA | Hua, Ling-Ling , Zhuang, Bi-Hui , Mao, Lin , Tian, Jin-Rong , Song, Yan-Rong . Optimization of the gain chip for optically pumped semiconductor disk lasers . | LASER PHYSICS LETTERS , 2023 , 20 (2) . |
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Abstract ：
We demonstrated a repetition-rate-tunable second harmonic mode-locked optically pumped semiconductor disk laser (OP-SDL), and the tuning range was from 1.168 GHz to 1.25 GHz. The entire tuning process was continuous, and OP-SDL was always in a mode-locked working state. To the best of our knowledge, this is the first work to obtain intracavity repetition rate tunable second harmonic laser in an OP-SDL. At same time, the repetition rate of fundamental wave can be continuously adjusted from 1.16 GHz to 1.66 GHz. The central wavelengths of the pulse trains were around 971 nm, and the highest repetition rate signal-to-noise ratio was more than 60 dB, indicating that the mode-locked pulses were stable.
Keyword ：
mode-locked mode-locked harmonic harmonic OP-SDL OP-SDL
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| GB/T 7714 | Zhuang, Bihui , Hua, Lingling , Tian, Jinrong et al. Repetition-rate-tunable second harmonic generation in mode-locked optically pumped semiconductor disk laser [J]. | LASER PHYSICS LETTERS , 2023 , 20 (1) . |
| MLA | Zhuang, Bihui et al. "Repetition-rate-tunable second harmonic generation in mode-locked optically pumped semiconductor disk laser" . | LASER PHYSICS LETTERS 20 . 1 (2023) . |
| APA | Zhuang, Bihui , Hua, Lingling , Tian, Jinrong , Zhang, Peng , Song, Yanrong . Repetition-rate-tunable second harmonic generation in mode-locked optically pumped semiconductor disk laser . | LASER PHYSICS LETTERS , 2023 , 20 (1) . |
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Abstract ：
We present a dispersion-managed mode-locked ytterbium fibre laser based on the nonlinear polarization evolution technique. Four single-pulse states could be generated by changing group delay dispersion values from anomalous (-0.0038 ps(2)) to normal (0.051 ps(2)) with a grating pair. In the normal dispersion regime, the pulse width was gradually decreased with the decrease of the net dispersion. In the anomalous dispersion region, the typical soliton was obtained, which time-bandwidth product could be calculated as 0.526. In addition, the dynamics of four states were also investigated by using the dispersive Fourier transformation technique. Different pulse evolution dynamics were observed from chaotic state to mode-locking.
Keyword ：
build-up dynamics build-up dynamics fibre laser fibre laser mode locking mode locking
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| GB/T 7714 | Wu, Yunfeng , Gao, Ziqi , Zhang, ZeXin et al. Build-up dynamics of different pulse types in a dispersion-managed Yb-doped fibre laser [J]. | LASER PHYSICS , 2023 , 33 (9) . |
| MLA | Wu, Yunfeng et al. "Build-up dynamics of different pulse types in a dispersion-managed Yb-doped fibre laser" . | LASER PHYSICS 33 . 9 (2023) . |
| APA | Wu, Yunfeng , Gao, Ziqi , Zhang, ZeXin , Liu, Haiyan , Tian, Jinrong , Song, Yanrong . Build-up dynamics of different pulse types in a dispersion-managed Yb-doped fibre laser . | LASER PHYSICS , 2023 , 33 (9) . |
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Abstract ：
An advanced light source at blue-green waveband is the key to improve the link-distance and communication performance of an underwater wireless optical communication (UWOC) system. This work presents the underwater channel characteristics and UWOC system using a blue semiconductor disk laser that passively mode-locked by a semiconductor saturable absorb mirror for the first time. The attenuation coefficients of the continuous-wave and mode-locked lasers under different concentrations of Maalox solution are studied, and the results indicate that the attenuation coefficients of the mode-locked laser are obviously lower than that of the continuous-wave laser. Then an UWOC system based on an acousto-optic modulator are constructed, and the water tank communication experiments are carried out by using quasi-cyclic low-density-parity-check coding and 64-pulse-position-modulation. Experimental results show that the bit error rates of the mode-locked laser are significantly lower than that of continuous-wave laser under the same Maalox solution concentration and same signal-noise-ratio. These results provide an attractive light source for practical long-distance UWOC.
Keyword ：
underwater wireless optical communication underwater wireless optical communication pulse position modulation pulse position modulation semiconductor disk laser semiconductor disk laser Acousto-optic modulator Acousto-optic modulator mode-locked mode-locked quasi-cyclic low-density-parity-check quasi-cyclic low-density-parity-check
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| GB/T 7714 | Liu, Liqi , Wang, Tao , Tian, Ruiyang et al. Underwater Channel Characteristics and Wireless Optical Communications Using a Blue Mode- Locked Semiconductor Disk Laser [J]. | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2023 , 41 (16) : 5340-5349 . |
| MLA | Liu, Liqi et al. "Underwater Channel Characteristics and Wireless Optical Communications Using a Blue Mode- Locked Semiconductor Disk Laser" . | JOURNAL OF LIGHTWAVE TECHNOLOGY 41 . 16 (2023) : 5340-5349 . |
| APA | Liu, Liqi , Wang, Tao , Tian, Ruiyang , Zhu, Renjiang , Tong, Cunzhu , Wang, Lijie et al. Underwater Channel Characteristics and Wireless Optical Communications Using a Blue Mode- Locked Semiconductor Disk Laser . | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2023 , 41 (16) , 5340-5349 . |
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Abstract ：
The dynamics of a common optical parametric oscillator (OPO) is demonstrated for the first time with dispersive Fourier transform (DFT) technique. The singly resonant MgO:PPLN-based optical parametric oscillator is synchronously pumped with an Yb-doped fiber amplifier, and delivers a femtosecond signal wave with a spectrum tuned from 1284 to 1517 nm. Then a DFT device is built and the birth and extinction dynamics of the single- and dual-wavelength signal wave of the OPO is recorded. Compared with conventional mode-locked lasers, the dynamics evolution of the OPO is entirely attributed to the nonlinear effects in the nonlinear crystal different from the atomic transitions in the active media, which gives rise to novel features in the starting progress of the OPO. Furthermore, a new way of energy transfer is discovered for the first time during the evolution of dualwavelength signal wave. The results are believed to provide a unique insight into evolution in OPOs and are instructive for in-depth understanding of OPO and other nonlinear devices and materials.
Keyword ：
Optical parametric oscillators Optical parametric oscillators Dispersive Fourier transform Dispersive Fourier transform Transient dynamics Transient dynamics
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| GB/T 7714 | Zhang, Zexin , Tian, Jinrong , Wang, Junheng et al. Transient dynamics in a common singly resonant optical parametric oscillator [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 161 . |
| MLA | Zhang, Zexin et al. "Transient dynamics in a common singly resonant optical parametric oscillator" . | OPTICS AND LASER TECHNOLOGY 161 (2023) . |
| APA | Zhang, Zexin , Tian, Jinrong , Wang, Junheng , Wu, Yunfeng , Song, Yanrong . Transient dynamics in a common singly resonant optical parametric oscillator . | OPTICS AND LASER TECHNOLOGY , 2023 , 161 . |
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Abstract ：
为了解决远距离光纤链路两端测量钟差限制在ps量级的问题，运用线性光学采样法测量钟差的基本理论，利用双光梳线性光学采样法完成了100 km光纤链路两端的钟差测量实验研究。通过梳齿压缩和色散补偿技术实现了光梳梳齿线宽和远距离光纤链路净色散量的优化，突破了高精度读取干涉花样中心时刻的难点，最终实现了高分辨力的钟差测量。通过时间间隔计数器与线性光学采样法测量光纤链路时延对比实验和100 km光纤链路钟差测量实验证明：基于线性光学采样法测量的钟差小于100 fs，能够有效满足高精度时间同步系统的要求。本研究为促进精密导航、高速通信和精准授时等领域的发展起到重要作用。
Keyword ：
双光梳 双光梳 线性光学采样 线性光学采样 高分辨力钟差测量 高分辨力钟差测量
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| GB/T 7714 | 吴云峰 , 孟飞 , 阿布都维力·阿布力克木 et al. 100 km光纤链路中小于100 fs分辨力的双光梳钟差测量实验研究 [J]. | 计测技术 , 2023 , 43 (03) : 136-143 . |
| MLA | 吴云峰 et al. "100 km光纤链路中小于100 fs分辨力的双光梳钟差测量实验研究" . | 计测技术 43 . 03 (2023) : 136-143 . |
| APA | 吴云峰 , 孟飞 , 阿布都维力·阿布力克木 , 宋晏蓉 , 张志刚 . 100 km光纤链路中小于100 fs分辨力的双光梳钟差测量实验研究 . | 计测技术 , 2023 , 43 (03) , 136-143 . |
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Abstract ：
Single pulse energy and pulse width can be theoretically increased indefinitely without pulse-breaking in a dissipative soliton resonance pulse (DSR) generated from a mode-locked fiber laser when the peak power is keeping in a certain value. But in some applications, both high pulse energy and high peak power are needed in one single pulse. To improve the peak power of the DSR pulse, the characteristics of DSR pulses were investigated and found that the position of the gain fiber is a factor to influence the peak power and the pulse width. Here, we demonstrate a thulium-doped mode-locked fiber laser operating in the DSR regime with a nonlinear amplifying loop mirror (NALM). When changing the position of the gain fiber, the peak power of DSR pulse could be improved from 0.38 W to 1.42 W with the same pump power. This approach provides a method for increasing the pulse energy and efficiency in mode locked fiber lasers, which may meet some special application.
Keyword ：
Thulium -doped fiber lasers Thulium -doped fiber lasers Nonlinear amplifying loop mirror Nonlinear amplifying loop mirror Dissipative soliton resonance Dissipative soliton resonance
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| GB/T 7714 | Wu, Yunfeng , Dong, Zikai , Hua, Lingling et al. Improvement of peak power of dissipative soliton resonance pulse in a thulium-doped fiber laser [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 157 . |
| MLA | Wu, Yunfeng et al. "Improvement of peak power of dissipative soliton resonance pulse in a thulium-doped fiber laser" . | OPTICS AND LASER TECHNOLOGY 157 (2023) . |
| APA | Wu, Yunfeng , Dong, Zikai , Hua, Lingling , Zhang, Zexin , Tian, Jinrong , Song, Yanrong . Improvement of peak power of dissipative soliton resonance pulse in a thulium-doped fiber laser . | OPTICS AND LASER TECHNOLOGY , 2023 , 157 . |
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Abstract ：
We demonstrated a harmonic mode-locked Erbium-doped fiber laser based on a saturable absorber (SA) of 2H-MoTe2, which is a member of the transition metal dichalcogenides. The SA mode-locker was made by integrating the 2H-MoTe2 into a D-shaped fiber, and then was inserted into an erbium-doped fiber laser for mode-locking. The nonlinear modulation depth and saturation power of 2H-MoTe2-based SA were 10.9% and 19 MW cm(-2), respectively. The fundamentally mode-locked pulse train had a pulse width of 577 fs and a repetition rate of 14.32 MHz. The highest order of harmonic mode locking was 55th, which had the repetition rate of 787.6 MHz, pulse width of 820 fs and average output power of 11.8 mW. To the best of our knowledge, this is the highest operating repetition frequency that has ever been demonstrated in a 2H-MoTe2-based fiber laser. The experimental results validate the feasibility of 2H-MoTe2 as a promising SA for generating ultrashort pulses with high repetition rates.
Keyword ：
2H-MoTe2 2H-MoTe2 mode-locked mode-locked harmonic harmonic
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| GB/T 7714 | Zhang, Lu-Lu , Xu, Lu-Feng , Wu, Yun-Feng et al. Passively harmonic mode-locked erbium-doped fiber laser based on 2H-MoTe2 saturable absorber [J]. | LASER PHYSICS LETTERS , 2022 , 19 (6) . |
| MLA | Zhang, Lu-Lu et al. "Passively harmonic mode-locked erbium-doped fiber laser based on 2H-MoTe2 saturable absorber" . | LASER PHYSICS LETTERS 19 . 6 (2022) . |
| APA | Zhang, Lu-Lu , Xu, Lu-Feng , Wu, Yun-Feng , Tian, Jin-Rong , Song, Yan-Rong . Passively harmonic mode-locked erbium-doped fiber laser based on 2H-MoTe2 saturable absorber . | LASER PHYSICS LETTERS , 2022 , 19 (6) . |
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