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Lasers and laser optics
272 W quasi-single-mode picosecond pulse laser of ytterbium-doped large-mode-area photonic crystal fiber
Download:508次
Meng Wang
1,2
Fan Wang
1,2
Suya Feng
1,*
Chunlei Yu
1,**
[ ... ]
Lili Hu
1,***
Author Affiliations
Abstract
1
Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
A large-mode-area (LMA) ytterbium-doped photonic crystal fiber (PCF) with core NA of 0.034 and core diameter of 50 μm was made by the stack-and-draw technique. The core is formed by Yb
3+
/Al
3+
/F
/P
5+
co-doped silica glass containing 0.09 mol% Yb
2
O
3
with an absorption coefficient at 976 nm up to 3.2 dB/m. The core glass with homogeneous distribution of Yb
3+
ions and refractive index difference of 4 × 10
4
compared with pure silica was prepared by the sol-gel method and heat homogenization at 2000°C. Laser power amplification of this LMA PCF was studied using a seed source of 21 ps pulse duration and 48.7 MHz repetition rate at 1030 nm wavelength. With pump power of 520 W, a maximum 272 W (266 kW peak power) quasi-single-mode laser output with
M
2
of 2.2 was achieved in a 4.7 m fiber length bent at a diameter of 47 cm with slope efficiency of 52%, and no obvious mode instability, stimulated Raman scattering, or thermal damage on the end facet of the fiber were observed.
140.3538
Lasers, pulsed
140.3615
Lasers, ytterbium
140.3510
Lasers, fiber
160.5690
Rare-earth-doped materials
PDF全文
Full Text
Chinese Optics Letters
2019, 17(7): 071401
Lasers and laser optics
Mode-locked fiber laser in the C-band region for dual-wavelength ultrashort pulses emission using a carbon nanotube saturable absorber
Editors' Pick
Download:967次
Kuen Yao Lau
1
Pin Jern Ker
1
Ahmad Fauzi Abas
2
Mohammed Thamer Alresheedi
2
Mohd Adzir Mahdi
3,*
Author Affiliations
Abstract
1
Electronics Research Group, Institute of Power Engineering, Universiti Tenaga Nasional, 43000 Kajang, Selangor, Malaysia
2
Department of Electrical Engineering, College of Engineering, King Saud University, Riyadh 11421, Kingdom of Saudi Arabia
3
Wireless and Photonics Networks Research Centre, Faculty of Engineering, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
A saturable absorber is commonly employed to generate an ultrashort laser with a mode-locking scheme. In an erbium-doped fiber laser system, the laser regimes of either 1530 or 1550 nm wavelength are procured based on the absorption profile of the erbium-doped fiber. The absorption of the erbium-doped fiber is designed to emit at both wavelengths by controlling the net gain of the laser cavity. Subsequently, simultaneous erbium-doped fiber laser emission is attained at 1533.5 and 1555.1 nm with the pulse duration of 910 and 850 fs, respectively. Therefore, this work maximizes the output portfolios of a mode-locking fiber laser for dual-wavelength ultrashort pulses emission.
140.3538
Lasers, pulsed
190.7110
Ultrafast nonlinear optics
320.7090
Ultrafast lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 051401
Nonlinear Optics
Highly efficient H-
β
Fraunhofer line optical parametric oscillator pumped by a single-frequency 355 nm laser
Jian Ma
1,2
Tingting Lu
1
Xiaolei Zhu
1,*
Xiuhua Ma
1
[ ... ]
Weibiao Chen
1
Author Affiliations
Abstract
1
Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
A highly efficient laser system output at the H-
β
Fraunhofer line of 486.1 nm has been demonstrated. A high pulse energy single-frequency hybrid 1064 nm master oscillator power amplifier was frequency-tripled to achieve 355 nm laser pulses, which acted as the pump source of the beta barium borate nanosecond pulse optical parametric oscillator. With pump energy of 190 mJ, the laser system generated a maximum output of 62 mJ blue laser pulses at 486.1 nm, corresponding to conversion efficiency of 32.6%. The laser spectrum width was measured to be around 0.1 nm, being in conformity with the spectrum width of the solar Fraunhofer line.
190.4970
Parametric oscillators and amplifiers
190.2620
Harmonic generation and mixing
140.3538
Lasers, pulsed
PDF全文
Full Text
Chinese Optics Letters
2018, 16(8): 081901
Lasers and Laser Optics
Numerical model and experimental demonstration of high precision ablation of pulse CO
2
laser
Ting He
1,2
Chaoyang Wei
1
Zhigang Jiang
1
Zhen Yu
1,2
[ ... ]
Jianda Shao
1,*
Author Affiliations
Abstract
1
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
To reveal the physical mechanism of laser ablation and establish the prediction model for figuring the surface of fused silica, a multi-physical transient numerical model coupled with heat transfer and fluid flow was developed under pulsed
CO
2
laser irradiation. The model employed various heat transfer and hydrodynamic boundary and thermomechanical properties for assisting the understanding of the contributions of Marangoni convention, gravitational force, vaporization recoil pressure, and capillary force in the process of laser ablation and better prediction of laser processing. Simulation results indicated that the vaporization recoil pressure dominated the formation of the final ablation profile. The ablation depth increased exponentially with pulse duration and linearly with laser energy after homogenous evaporation. The model was validated by experimental data of pulse
CO
2
laser ablation of fused silica. To further investigate laser beam figuring, local ablation by varying the overlap rate and laser energy was conducted, achieving down to 4 nm homogenous ablation depth.
140.3390
Laser materials processing
140.3470
Lasers, carbon dioxide
220.5450
Polishing
140.3538
Lasers, pulsed
PDF全文
Full Text
Chinese Optics Letters
2018, 16(4): 041401
Lasers and Laser Optics
Investigation of latest generation pulsed fiber laser in dissimilar joining of Al and Mg alloys
Download:551次
Qiong Gao
1
Sonia Meco
2
Kehong Wang
1,*
Qi Zhou
1
[ ... ]
Supriyo Ganguly
2
Author Affiliations
Abstract
1
School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2
Welding Engineering and Laser Processing Centre, Cranfield University, Bedford MK43 0AL, United Kingdom
Dissimilar metal joining of magnesium to aluminum was investigated using the latest generation nanosecond pulsed fiber laser. The tensile shear test shows that the average tensile shear strength of a joint was 86 MPa, which was 75% of the aluminum substrate. The weld interface exhibited a mixture phase (Mg solid solution and
Mg
17
Al
12
) that improves the strength and toughness of the joint. A thin Mg–Al intermetallic compound layer was formed on both sides of the weld seam toward the Al side. Fracture occurred toward the Al substrate side rather than the Mg–Al interface, indicating a high joining strength at the weld interface.
140.3390
Laser materials processing
140.7090
Ultrafast lasers
140.3538
Lasers, pulsed
PDF全文
Full Text
Chinese Optics Letters
2018, 16(6): 061401
Lasers and Laser Optics
Stimulated Brillouin scattering threshold dependent on temporal characteristics in a kilowatt-peak-power, single-frequency nanosecond pulsed fiber amplifier
Download:1180次
Man Hu
1,2
Zhao Quan
1
Jianhua Wang
3
Kai Liu
1
[ ... ]
Jun Zhou
1,***
Author Affiliations
Abstract
1
Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Department of Space and Command, Academy of Equipment, Beijing 101416, China
The stimulated Brillouin scattering (SBS) threshold affected by repetition rate and pulse duration in a single-frequency nanosecond pulsed fiber amplifier is studied. The experimental results demonstrate that the SBS threshold can be improved either by reducing the repetition rate or by narrowing the pulse duration; however, the average power may be limited in some cases. Otherwise, two evaluation methods for the SBS threshold in the fiber amplifier are compared and discussed, aiming to obtain a more accurate description for the SBS threshold in our single-frequency amplifier system.
140.3538
Lasers, pulsed
140.3280
Laser amplifiers
060.4370
Nonlinear optics, fibers
190.5890
Scattering, stimulated
PDF全文
Full Text
Chinese Optics Letters
2016, 14(3): 031403
Lasers and Laser Optics
Stable single-mode operation of injection-seeded
Q
-switched Nd:YAG laser by sine voltage modulation
Yongfei Gao
1,3
Junxuan Zhang
1,2
Huaguo Zang
1
Xiaolei Zhu
1,*
[ ... ]
Weibiao Chen
1
Author Affiliations
Abstract
1
Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Shanghai University, Shanghai 201800, China
Based on the modified ramp and fire technique, a novel injection seeding approach with real-time resonance tracking is successfully demonstrated in a single-frequency Nd:YAG pulsed laser. Appling a high-frequency sinusoidal modulation voltage to one piezo actuator and an adjustable DC voltage to another piezo actuator for active feedback, single-mode laser output with high-frequency stability is obtained, and the effect of the piezo hysteresis on the frequency stability can be eliminated for a laser diode pumped
Q
-switched Nd:YAG laser at a repetition rate of 400 Hz.
140.3425
Laser stabilization
140.3570
Lasers, single-mode
140.3538
Lasers, pulsed
PDF全文
Full Text
Chinese Optics Letters
2016, 14(7): 071401
Lasers and Laser Optics
255 W picosecond MOPA laser based on self-made Yb-doped very-large-mode-area photonic crystal fiber
Ziwei Wang
1,2
Qiurui Li
1
Zhaokun Wang
1,2
峰 邹
1,2
[ ... ]
Jun Zhou
1,*
Author Affiliations
Abstract
1
Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100039, China
3
Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
We report on the amplification of high-average-power and high-efficiency picosecond pulses in a self-made very-large-mode-area Yb-doped photonic crystal fiber (PCF). The PCF with a core diameter of 105 μm and a core numerical aperture of 0.05 is prepared by the sol-gel method combined with the powder sintering technique. The fiber amplification system produces the highest average power of 255 W at a 10 MHz repetition rate with a 21 ps pulse duration corresponding to a peak power of 1.2 MW. This result exemplifies the high-average-power and high-peak-power potential of this specifically designed fiber.
140.3538
Lasers, pulsed
140.3615
Lasers, ytterbium
140.3280
Laser amplifiers
140.3510
Lasers, fiber
PDF全文
Full Text
Chinese Optics Letters
2016, 14(8): 081401
Lasers and Laser Optics
Actively
Q
-switched ring Tm-doped fiber laser with free space structure
Wei Liu
Youlun Ju
*
Tongyu Dai
Liwei Xu
[ ... ]
Xiaoming Duan
Author Affiliations
Abstract
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China
We report a cladding-pumped actively
Q
-switched ring Tm-doped fiber laser (TDFL). This laser is
Q
-switched by a free space acousto-optic modulator. A pulse energy up to 150 μJ with a pulse width of 207 ns at a repetition rate of 100 Hz is achieved for a cavity optical length of 6.68 m. The pulse amplitude’s stability at this repetition rate is better than 95%. To the best of our knowledge, this is the first free space structure
Q
-switched ring TDFL report.
140.3480
Lasers, diode-pumped
140.3510
Lasers, fiber
140.3538
Lasers, pulsed
140.3540
Lasers, Q-switched
PDF全文
Full Text
Chinese Optics Letters
2016, 14(9): 091401
Lasers and Laser Optics
Characterization of electromagnetic pulses via arrays on ShenGuang-III laser facility laser
Download:996次
Ming Yang
1
Tingshuai Li
1
Chuanke Wang
2
Jinwen Yang
1,2
[ ... ]
Yongkun Ding
2
Author Affiliations
Abstract
1
School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2
Laser Fusion Research Center, Chinese Academy of Engineering Physics, Mianyang 621900, China
Intensive electromagnetic pulses (EMPs) can be generated from interaction of the ultra-intense lasers and solid targets in inertial confinement fusion (ICF), which will detrimentally affect the data acquisition from some electric components. A diagnostic system for EMP measurement inside and outside the ShenGuang-III facility is designed and fabricated in this study. The experimental results indicate that the peak magnitude of EMP reaches up to 3210.7 kV/m and 6.02 T. The received signals depend most on the antenna and target types. The half-hohlraum generates a more intensive EMP radiation than that from the other targets, and the large planar and medium discone capture much stronger signals than the other antennas. In addition, the mechanisms of EMP generation from different targets are discussed. The resulting conclusion are expected to provide the experimental basis for further EMP shielding design.
140.3320
Laser cooling
140.3538
Lasers, pulsed
350.5610
Radiation
PDF全文
Full Text
Chinese Optics Letters
2016, 14(10): 101402
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