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【Jingui Ma】
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Nonlinear Optics
Ultrabroadband second-harmonic generation via spatiotemporal-coupled phase matching
Yudong Tao
1
Wentao Zhu
1
Yanfang Zhang
1
Jingui Ma
1
[ ... ]
Liejia Qian
1,3
Author Affiliations
Abstract
1
Key Laboratory for Laser Plasma, Shanghai Jiao Tong University, Shanghai 200240, China
2
Key Laboratory of Micro and Nano Photonic Structures, Fudan University, Shanghai 200433, China
3
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
We propose a spatially chirped quasi-phase-matching (QPM) scheme that enables ultrabroadband second-harmonic-generation (SHG) by using a fan-out QPM grating to frequency-convert a spatially chirped fundamental wave. A “zero-dispersion” 4
f
system maps the spectral contents of ultrabroadband fundamental onto different spatial coordinates in the Fourier plane, where the fundamental is quasi-monochromatic locally in picosecond duration, fundamentally canceling high-order phase mismatch. A fan-out QPM grating characterized by a linear variation of the poling period along the transverse direction exactly supports the QPM of the spatially chirped beam. We theoretically demonstrate the SHG of an 810-nm, 12.1-fs pulse into a 405-nm, 10.2-fs pulse with a conversion efficiency of 77%.
nonlinear optics
second-harmonic generation
few-cycle pulse
PDF全文
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Chinese Optics Letters
2024, 22(1): 011901
强激光物理与技术
基于光参量过程直接产生高重频超短脉冲序列
王文昊
1
周冰洁
2
章艳芳
1
王静
1,*
[ ... ]
钱列加
1,4
作者单位
摘要
1
上海交通大学 物理与天文学院,上海 200240
2
上海无线电设备研究所,上海 201109
3
复旦大学 信息科学与工程学院,上海 200433
4
上海交通大学 李政道研究所,上海 200240
论证了单晶体光参量放大(OPA)过程在特定边界条件下满足频域宇称-时间(PT)反对称性。归一化的数值求解结果显示,OPA系统PT对称阈值点附近呈现增益跃变性质。对于存在位相失配的OPA,通过实时调控泵浦光强,即可控制系统PT对称性,论文基于相位失配OPA中可超快调控PT对称性的特性构建了超快光开关,一方面光开关与周期性幅度调制的泵浦光联合使用,可直接将连续激光转换为超短脉冲序列输出;另一方面,构建的光开关也可用于脉冲激光再压缩,有望用于中红外波等长波段超短种子源。论文提出的基于超快光开关直接产生超短脉冲序列的方案,由于不需要光学谐振腔,易于实现大于10 GHz的超高重复频率。
二阶非线性光学
光学参量放大
超短脉冲序列
非厄米哈密顿量
频域宇称时间反对称
quadratic nonlinear optics
optical parametric amplification
ultrashort pulse sequence
non-Hermitian Hamiltonian
spectral parity-time anti-symmetry
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强激光与粒子束
2023, 35(9): 091005
Research Articles
Spatiotemporally mode-locked soliton fiber laser at 2.8 μm
Ying’an Chen
Yicheng Zhou
Zhipeng Qin
Guoqiang Xie
*
[ ... ]
Liejia Qian
Author Affiliations
Abstract
School of Physics and Astronomy, Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai, China
Spatiotemporal mode-locking creates great opportunity for pulse energy scaling and nonlinear optics research in fiber. Until now, spatiotemporal mode-locking has only been realized in normal-dispersion dissipative soliton and similariton fiber lasers. In this paper, we demonstrated the first experimental realization of a spatiotemporally mode-locked soliton laser in mid-infrared fluoride fiber with anomalous dispersion. The mode-locked fluoride fiber oscillator directly generated a record pulse energy of 16.1 nJ and peak power of 74.6 kW at 2.8 μm wavelength. This work extends the spatiotemporal mode-locking to soliton fiber lasers and should have a wide interest for the laser community.
mid-infrared
soliton fiber laser
spatiotemporal mode-locking
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High Power Laser Science and Engineering
2023, 11(5): 05000e59
Research Articles
Parametric generation and phase locking of multiple sidebands in the regime of full-back-conversion
Wenhao Wang
1
Yudong Tao
1
Jingui Ma
1
Jing Wang
1,*
[ ... ]
Liejia Qian
1,2
Author Affiliations
Abstract
1
School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
2
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China
Parametric interaction allows both forward and backward energy transfers among the three interacting waves. The back-conversion effect is usually detrimental when unidirectional energy transfer is desired. In this theoretical work, we manifest that the back-conversion effect underpins the direct generation of the picosecond pulse train without the need for a laser resonator. The research scenario is an optical parametric amplification (OPA) that consists of a second-order nonlinear medium, a quasi-continuous pump laser and a sinusoidal amplitude-modulated seed signal. The back-conversion of OPA can transfer the modulation peaks (valleys) of the incident signal into output valleys (peaks), which inherently induces spectral sidebands. The generation of each sideband is naturally accompanied with a phase shift of ±
π
. In the regime of
full-back-conversion
, the amount and amplitude of the sidebands reach the maximum simultaneously, and their phase constitutes an arithmetic sequence, leading to the production of a picosecond pulse train. The generated picosecond pulse train can have an ultrahigh repetition rate of 40 GHz or higher, which may facilitate ultrafast applications with ultrahigh speed.
picosecond pulse train
quadratic parametric process
sideband generation
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High Power Laser Science and Engineering
2023, 11(2): 02000e21
Research Articles
Large temporal window and high-resolution single-shot cross-correlator with two separate measurement channels
Jingui Ma
1
Xiaoping Ouyang
2,*
Liangze Pan
2
Peng Yuan
1
[ ... ]
Liejia Qian
1,3
Author Affiliations
Abstract
1
Key Laboratory for Laser Plasmas (MOE), Collaborative Innovation Center of IFSA, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
2
Joint Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
3
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China
In strong-field physics experiments with ultraintense lasers, a single-shot cross-correlator (SSCC) is essential for fast optimization of the pulse contrast and meaningful comparison with theory for each pulse shot. To simultaneously characterize an ultrashort pulse and its long pedestal, the SSCC device must have both a high resolution and a large temporal window. However, the resolution and window in all kinds of single-shot measurement contradict each other in principle. Here we propose and demonstrate a novel SSCC device with two separate measurement channels: channel-1 for the large-window pedestal measurement has a moderate resolution but a large window, while channel-2 for the ultrashort pulse measurement has a small window but a high resolution; this allows the accurate characterization of the pulse contrast in a single shot. A two-channel SSCC device with a 200-fs resolution and 114-ps window has been developed and tested for its application in ultraintense lasers at 800 nm.
pulse contrast
single-shot cross-correlator
ultrashort ultraintense laser
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High Power Laser Science and Engineering
2022, 10(6): 06000e43
Research Articles
Numerical study of spatial chirp distortion in quasi-parametric chirped-pulse amplification
Yirui Wang
1
Jing Wang
1,*
Jingui Ma
1
Peng Yuan
1
Liejia Qian
1,2
Author Affiliations
Abstract
1
School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai200240, China
2
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai200240, China
Optical parametric chirped-pulse amplification is inevitably subject to high-order spatial chirp, particularly under the condition of saturated amplification and a Gaussian pump; this corresponds to an irreversible spatiotemporal distortion and consequently degrades the maximum attainable focused intensity. In this paper, we reveal that such spatial chirp distortion can be significantly mitigated in quasi-parametric chirped-pulse amplification (QPCPA) with idler absorption. Simulation results show that the quality of focused intensity in saturated QPCPA is nearly ideal, with a spatiotemporal Strehl ratio higher than 0.98. As the seed bandwidth increases, the idler absorption spectrum may not be uniform, but the Strehl ratio in QPCPA can be still high enough due to stronger idler absorption.
gain saturation
quasi-parametric chirped-pulse amplification
spatiotemporal distortions
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High Power Laser Science and Engineering
2022, 10(3): 03000e20
“超快光学”专辑
基于级联光参量放大的超短脉冲群速度调控(特邀)
周冰洁
1,2
马金贵
1,*
袁鹏
1
王静
1
钱列加
1
作者单位
摘要
1
上海交通大学 物理与天文学院 激光等离子体教育部重点实验室, 上海200240
2
上海无线电设备研究所, 上海01109
提出并研究了一种宽带、大量程、方向可控的超短脉冲群速度调控方法。利用级联光参量放大,将泵浦光时域的线性强度调制转移至啁啾信号光频域的线性位相调制,压缩后信号光脉冲将获得延时或提前。通过调控泵浦时域强度调制的斜率大小和符号,可对信号光群速度调控的量程和方向进行灵活操控。级联光参量放大过程不需要满足位相匹配,响应带宽很大,原理上支持周期量级脉冲的群速度调控。分别研究了锯齿型和高斯型脉冲泵浦的级联光参量放大过程,演示验证了该方法的调控效果。该方法可在常规非线性晶体中实施,具备应用价值。
非线性光学
超快群速度调控
超短脉冲
光参量过程
数值模拟
Nonlinear optics
Ultrafast group-velocity control
Ultrashort pulse
Optical parametric process
Numerical simulation
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Full Text
光子学报
2021, 50(8): 0850212
Lasers and Laser Optics
Generation of 131 fs mode-locked pulses from 2.8 μm Er:ZBLAN fiber laser
Download:996次
Hongan Gu
Zhipeng Qin
Guoqiang Xie
*
Ting Hai
[ ... ]
Liejia Qian
Author Affiliations
Abstract
School of Physics and Astronomy, Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
We demonstrated a femtosecond mode-locked Er:ZrF
4
-BaF
2
-LaF
3
-AlF
3
-NaF (Er:ZBLAN) fiber laser at 2.8 μm based on the nonlinear polarization rotation technique. The laser generated an average output power of 317 mW with a repetition rate of 107 MHz and pulse duration as short as 131 fs. To the best of our knowledge, this is the shortest pulse generated directly from a mid-infrared mode-locked Er:ZBLAN fiber laser to date. Numerical simulation and experimental results confirm that reducing the gain fiber length is an effective way to shorten the mode-locked pulse duration in the Er:ZBLAN fiber laser. The work takes an important step towards sub-100-fs mid-infrared pulse generation from mode-locked Er:ZBLAN fiber lasers.
generation
mode-locked pulses
Er:ZBLAN fiber
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Chinese Optics Letters
2020, 18(3): 031402
Letters
Mode-locked 2.8-
μ
m fluoride fiber laser: from soliton to breathing pulse
Download:831次
Zhipeng Qin
1,2,3
Guoqiang Xie
1,2,3,*
Hongan Gu
1,2,3
Ting Hai
1,2,3
[ ... ]
Liejia Qian
1,2,3,*
Author Affiliations
Abstract
1
Shanghai Jiao Tong University, School of Physics and Astronomy, Shanghai, China
2
Shanghai Jiao Tong University, Collaborative Innovation Center of Inertial Fusion Sciences and Applications, Shanghai, China
3
Shanghai Jiao Tong University, Key Laboratory for Laser Plasmas, Ministry of Education, Shanghai, China
The mode-locked fluoride fiber laser (MLFFL) is an exciting platform for directly generating ultrashort pulses in the mid-infrared (mid-IR). However, owing to difficulty in managing the dispersion in fluoride fiber lasers, MLFFLs are restricted to the soliton regime, hindering pulse-energy scaling. We overcame the problem of dispersion management by utilizing the huge normal dispersion generated near the absorption edge of an infrared-bandgap semiconductor and promoted MLFFL from soliton to breathing-pulse mode-locking. In the breathing-pulse regime, the accumulated nonlinear phase shift can be significantly reduced in the cavity, and the pulse-energy-limitation effect is mitigated. The breathing-pulse MLFFL directly produced a pulse energy of 9.3 nJ and pulse duration of 215 fs, with a record peak power of 43.3 kW at 2.8 μm. Our work paves the way for the pulse-energy and peak-power scaling of mid-IR fluoride fiber lasers, enabling a wide range of applications.
ultrafast fiber laser
mid-infrared
breathing pulse
mode-locking
dispersion management
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Advanced Photonics
2019, 1(6): 065001
Research Articles
Toward
terawatt few-cycle pulses via optical parametric chirped-pulse amplification with oxide
crystals
Download:584次
Jinsheng Liu
1
Jingui Ma
1,†
Jing Wang
1
Peng Yuan
1
[ ... ]
Liejia Qian
1,2
Author Affiliations
Abstract
1
Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Centre of IFSA (CICIFSA), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
High-power femtosecond lasers beyond
$5~\unicode[STIX]{x03BC}\text{m}$
are attractive for strong-field physics with mid-infrared (IR) fields but are difficult to scale up. In optical parametric chirped-pulse amplification (OPCPA) at mid-IR wavelengths, a nonlinear crystal is vital, and its transmittance, dispersion, nonlinear coefficient and size determine the achievable power and wavelength. OPCPA beyond
$5~\unicode[STIX]{x03BC}\text{m}$
routinely relies on semiconductor crystals because common oxide crystals are not transparent in this spectral range. However, the small size and low damage threshold of semiconductor crystals fundamentally limit the peak power to gigawatts. In this paper, we design a terawatt-class OPCPA system at
$5.2~\unicode[STIX]{x03BC}\text{m}$
based on a new kind of oxide crystal of
$\text{La}_{3}\text{Ga}_{5.5}\text{Nb}_{0.5}\text{O}_{14}$
(LGN). The extended transparent range, high damage threshold, superior phase-matching characteristics and large size of LGN enable the generation of 0.13 TW seven-cycle pulses at
$5.2~\unicode[STIX]{x03BC}\text{m}$
. This design fully relies on the state-of-the-art OPCPA technology of an octave-spanning ultrafast Ti:sapphire laser and a thin-disk Yb:YAG laser, offering the performance characteristics of high power, a high repetition rate and a stable carrier–envelope phase.
few-cycle
mid-infrared
OPCPA
oxide LGN crystals
PDF全文
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High Power Laser Science and Engineering
2019, 7(4): 04000e61
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