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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
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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
“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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光子学报
2021, 50(8): 0850212
“纪念激光器发明60周年”专题
高能钕玻璃激光的高效率宽带2.5倍频技术(特邀)
王静
袁鹏
马金贵
钱列加
*
作者单位
摘要
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
提出了一种可同时实现高效率和大带宽的频率上转换技术,可将高能钕玻璃基频激光(波长1 054 nm)高效率地转换为紫蓝光波段的宽带2.5倍频激光(波长421.5 nm).将窄带钕玻璃的倍频激光与中心波长为2 100 nm的宽带中红外激光以能量比4∶1进行非线性和频,并通过非共线构型实现位相匹配和群速度匹配,实验产生了能量为12.4 J、带宽为10.4 nm(相对带宽大于2%)的宽带2.5倍频激光.实验结果能够支撑紫蓝光波段百太瓦强激光的产生,为未来开发短波长的超短超强激光提供借鉴.
非线性光学
宽带2.5倍频技术
宽窄带和频
宽带紫蓝激光
Nonlinear optics
Broadband 2.5th harmonic generation
Sum-frequency mixing of broadband and narrowband lasers
Broadband lasers in the violet-blue region
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光子学报
2020, 49(11): 26
Lasers and Laser Optics
Generation of 131 fs mode-locked pulses from 2.8 μm Er:ZBLAN fiber laser
Download:997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
Nonlinear Optics
Analysis and evaluation of idler absorption for quasi-parametric chirped-pulse amplification
Download:657次
Dongxia Hu
1,2
Yudong Tao
2
Jingui Ma
3
Jing Wang
3,*
[ ... ]
Liejia Qian
3
Author Affiliations
Abstract
1
Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
2
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
3
Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Center of IFSA (CICIFSA), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
Quasi-parametric chirped-pulse amplification (QPCPA) can improve the signal amplification efficiency and stability by inhibiting the back-conversion, in which the idler absorption plays a critical role. This Letter theoretically studies the impacts of idler absorption on the QPCPA performance in both the small-signal and saturation regimes. We demonstrate that there exists an optimal idler absorption that enables the achievement of maximum pump depletion within a minimum crystal length. To overcome the reduction in small-signal gain induced by idler absorption, the configuration of gradient idler absorption is proposed and demonstrated as a superior alternative to constant idler absorption. The results provide guidelines to the design of state-of-the-art QPCPA lasers.
190.4410
Nonlinear optics, parametric processes
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Chinese Optics Letters
2018, 16(12): 121901
Ultrafast Optics
Characterization and application of plasma mirror for ultra-intense femtosecond lasers
Download:901次
Xulei Ge
1,2,3
Yuan Fang
2,3
Su Yang
2,3
Wenqing Wei
2,3
[ ... ]
Jie Zhang
2,3
Author Affiliations
Abstract
1
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
2
Key Laboratory for Laser Plasmas (MoE) and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
3
Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
The femtosecond laser pulses reflected from the self-induced plasma mirror (PM) surface are characterized. More than two orders of magnitude improvement on intensity contrast both in nanosecond and picosecond temporal scales are measured. The far-field distribution, i.e., focusability, is measured to degrade in comparison with that without using a PM. Experiments on proton accelerations are performed to test the effect of the balance between degraded focusability and increased reflectivity. Our results show that PM is an effective and robust device to improve laser contrast for applications.
320.5540
Pulse shaping
320.7080
Ultrafast devices
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Chinese Optics Letters
2018, 16(1): 013201
Photonics based on 2D noncarbon materials
2 μm mode-locking laser performances of sol-gel-fabricated large-core Tm-doped silica fiber
Yan Ren
1
Zhipeng Qin
1
Guoqiang Xie
1,*
Zhen Qiao
1
[ ... ]
Lili Hu
2
Author Affiliations
Abstract
1
Key Laboratory for Laser Plasmas of the Ministry of Education, Collaborative Innovation Center of IFSA (CICIFSA), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2
Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
High-power ultrafast fiber lasers operating at the 2 μm wavelength are extremely desirable for material processing, laser surgery, and nonlinear optics. Here we fabricated large-core (LC) double-cladding Tm-doped silica fiber via the sol-gel method. The sol-gel-fabricated Tm-doped silica (SGTS) fiber had a large core diameter of 30 μm with a high refractive index homogeneity (
Δ
n
=
2
×
10
4
). With the newly developed LC SGTS fiber as the gain fiber, high-power mode-locking was realized. By using a semiconductor saturable absorber mirror (SESAM) as a mode locker, the LC SGTS fiber oscillator generated mode-locked pulses with an average output power as high as 1.0 W and a pulse duration of 23.9 ps at the wavelength of 1955.0 nm. Our research results show that the self-developed LC Tm-doped silica fiber via the sol-gel method is a promising gain fiber for generating high-power ultrafast lasers in the 2 μm spectral region.
060.2290
Fiber materials
060.3510
Lasers, fiber
140.4050
Mode-locked lasers
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Chinese Optics Letters
2018, 16(2): 020020
Nonlinear Optics
Origin and suppression of back conversion in a phase-matched nonlinear frequency down-conversion process
Download:837次
Jingui Ma
Jing Wang
Peng Yuan
*
Guoqiang Xie
Liejia Qian
Author Affiliations
Abstract
Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, IFSA Collaborative Innovation Centre, Shanghai Jiao Tong University, Shanghai 200240, China
Back conversion is an intrinsic phenomenon in nonlinear frequency down-conversion processes. However, the physical reason for its occurrence is not well understood. Here, we theoretically reveal that back conversion is the result of a
π
-phase jump associated with the depletion of one interacting wave. By suppressing the idler phase jump through a deliberate crystal absorption, the back conversion can be inhabited, thus enhancing the conversion efficiency from the pump to the signal. The results presented in this Letter will further the understanding of nonlinear parametric processes and pave the way toward the design of highly efficient down-conversion systems.
190.4223
Nonlinear wave mixing
190.4975
Parametric processes
190.7110
Ultrafast nonlinear optics
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Chinese Optics Letters
2017, 15(2): 021901
Lasers and Laser Optics
Mid-infrared Er:ZBLAN fiber laser reaching 3.68 μm wavelength
Zhipeng Qin
Guoqiang Xie
*
Jingui Ma
Peng Yuan
Liejia Qian
Author Affiliations
Abstract
Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Center of IFSA (CICIFSA), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
We report a continuous-wave Er:ZBLAN fiber laser with the operation wavelength reaching 3.68 μm. The mid-infrared Er:ZBLAN fiber laser is pumped with the dual-wavelength sources consisting of a commercial laser diode at 970 nm and a homemade Tm-doped fiber laser at 1973 nm. By increasing the launched pump power at 1973 nm, the laser wavelength can be switched from 3.52 to 3.68 μm. The maximum output power of 0.85 W is obtained with a slope efficiency of 25.14% with respect to the 1973 nm pump power. In the experiment, the laser emission at 3.68 μm is obtained with a significant power of 0.62 W, which is the longest emission wavelength in free-running Er:ZBLAN fiber lasers.
140.3070
Infrared and far-infrared lasers
060.2390
Fiber optics, infrared
060.3510
Lasers, fiber
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Chinese Optics Letters
2017, 15(11): 111402
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