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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:512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
Hybrid femtosecond laser system based on a Yb:KGW regenerative amplifier for
N
P
polarization
Download:523次
Dongyu Yan
Bowen Liu
Yuxi Chu
*
Huanyu Song
[ ... ]
Chingyue Wang
Author Affiliations
Abstract
Ultrafast Laser Laboratory, Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
We report a hybrid femtosecond laser system based on a femtosecond Yb-doped fiber laser and a Yb-doped potassium gadolinium tungstate (Yb:KGW) regenerative amplifier. To match the central wavelength of the seed source, a Yb:KGW crystal is used in the regenerative amplifier for
N
p
polarization. We study and optimize the dynamics of nonlinear amplification to alleviate the gain narrowing effect. With optimization, the system can output 270 fs pulses with
21
μ
J
pulse energy at a 60 kHz repetition rate.
140.3280
Laser amplifiers
140.3615
Lasers, ytterbium
PDF全文
Full Text
Chinese Optics Letters
2019, 17(4): 041404
Lasers and laser optics
Non-isothermal bleaching of Yb–Li co-doped silica fibers
Download:598次
Miao Li
1,2
Gui Chen
2
Jinyong Leng
1
Jinbao Chen
1,*
Jinyan Li
2
Author Affiliations
Abstract
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China
In this work, non-isothermal bleaching of Yb–Li co-doped fiber was investigated. The Yb–Li co-doped fiber was beneficial to reduce the photodarkening-induced excess loss and had no bad effect on the temperature of thermal bleaching (TB). Photodarkened fibers were bleached with different temperature ramp rates. The higher the ramp rate, the higher the complete bleaching temperature. The activation energy of the bleaching of Yb/Al/Li fiber was calculated by fitting, which was similar to that of an Yb-doped fiber. These observations are helpful in revealing the relationship between the mechanism of Li ion co-doping and TB.
140.3615
Lasers, ytterbium
060.3510
Lasers, fiber
PDF全文
Full Text
Chinese Optics Letters
2019, 17(3): 031401
Lasers and Laser Optics
4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings
Baolai Yang
1
Hanwei Zhang
1,2,3
Qing Ye
4
Haoyang Pi
4
[ ... ]
Xiaojun Xu
1,2,3,*
Author Affiliations
Abstract
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
3
Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China
4
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
With the increasing output power of the monolithic fiber laser oscillators, the stimulated Raman scattering (SRS) effect becomes one of the main limitations of power scaling. Employing fiber with a larger mode area is an effective technique to mitigate the SRS, but, for the monolithic fiber laser oscillators, the difficulty of the inscription of the high-reflection fiber Bragg gratings (FBGs) increases with the fiber mode area. In this work, we demonstrated a high-power monolithic fiber laser oscillator based on the home-made large mode area FBGs and ytterbium-doped fiber (YDF) with 25 μm core diameters. A maximum output power of 4.05 kW is achieved at the central wavelength of
~
1080
nm
with a total 915 nm pump power of
~
6.7
kW
. At the operation of 4.05 kW, the intensity of the Raman Stokes light is
~
25
dB
below the signal laser, and the beam quality (
M
2
-factor) is
~
2.2
. To the best of our knowledge, this is the first detailed report of the monolithic fiber laser oscillator with an output power beyond 4 kW.
140.3510
Lasers, fiber
140.3615
Lasers, ytterbium
PDF全文
Full Text
Chinese Optics Letters
2018, 16(3): 031407
Lasers and Laser Optics
Diode-pumped power scalable Kerr-lens mode-locked Yb:CYA laser
Download:668次
Wenlong Tian
1
Yingnan Peng
1
Ziyue Zhang
2
Zijiao Yu
2
[ ... ]
Zhiyi Wei
2
Author Affiliations
Abstract
1
School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
2
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3
Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
Stable 68 fs pulses with the average power of 1.5 W is directly generated from a multimode diode-pumped Kerr-lens mode-locked Yb:CYA laser by separating the gain medium and Kerr medium. The repetition rate is about 50 MHz, resulting in a single pulse energy of 30 nJ and a peak power of 0.44 MW. To the best of our knowledge, this is the highest single pulse energy ever produced from a mode-locked Yb:CYA oscillator. Our experimental results show that Yb:CYA crystal is an excellent candidate for multiwatt, sub-100 fs pulse generation in diode-pumped all-solid-state lasers. It is believed that the output power can be scalable to multi-W while the pulse duration is maintained with this simple method.
Mode-locked lasers
Lasers, ytterbium
Lasers, solid-state
PDF全文
Full Text
Photonics Research
2018, 6(2): 02000127
Lasers and Laser Optics
Fiber laser with random-access pulse train profiling for a photoinjector driver
Ekaterina I. Gacheva
1
Anatoly K. Poteomkin
1
Sergey Yu. Mironov
1
Viktor V. Zelenogorskii
1
[ ... ]
Vladimir Ya. Molchanov
2
Author Affiliations
Abstract
1
Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), 46 Ulyanov Street, Nizhny Novgorod 603950, Russia
2
National University of Science and Technology “MISIS,” 4 Leninsky Prospekt, Moscow 119049, Russia
We report on the design and performance of a fiber laser system with adaptive acousto-optic macropulse control for a novel photocathode laser driver with 3D ellipsoidal pulse shaping. The laser system incorporates a three-stage fiber amplifier with an integrated acousto-optical modulator. A digital electronic control system with feedback combines the functions of the arbitrary micropulse selection and modulation resulting in macropulse envelope profiling. As a benefit, a narrow temporal transparency window of the modulator, comparable to a laser pulse repetition period, effectively improves temporal contrast. In experiments, we demonstrated rectangular laser pulse train profiling at the output of a three-cascade Yb-doped fiber amplifier.
Laser amplifiers
Lasers, ytterbium
Acousto-optical devices
Modulators
PDF全文
Full Text
Photonics Research
2017, 5(4): 04000293
Lasers and Laser Optics
33 W continuous-wave single-frequency green laser by frequency doubling of a single-mode YDFA
Shuzhen Cui
1
Lei Zhang
1,2
Huawei Jiang
1,3
Yan Feng
1,*
Author Affiliations
Abstract
1
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and Shanghai Key Laboratory of Solid State Laser and Application, Shanghai 201800, China
2
e-mail: zhangl@siom.ac.cn
3
Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
A high power continuous-wave single-frequency green fiber laser by second-harmonic generation of a Yb-doped fiber amplifier (YDFA) is developed. A linearly polarized single-mode fiber amplifier produces a 60 W infrared laser at 1064 nm with a 103 W incident diode pump laser at 976 nm, corresponding to an optical conversion efficiency of 58%. An external bow-tie enhancement cavity incorporating a noncritically phase-matched lithium triborate crystal is employed for second-harmonic generation. A 33.2 W laser at 532 nm is obtained with a 45 W incident 1064 nm fundamental laser, corresponding to a conversion efficiency of 74%.
140.3510
Lasers, fiber
140.3515
Lasers, frequency doubled
140.3615
Lasers, ytterbium
PDF全文
Full Text
Chinese Optics Letters
2017, 15(4): 041402
Lasers and Laser Optics
Picosecond pulse generation in a mono-layer MoS
2
mode-locked Ytterbium-doped thin disk laser
Jun Lu
1,2,3
Xiao Zou
2
Chun Li
2
Wenkai Li
2
[ ... ]
Yuxin Leng
2,*
Author Affiliations
Abstract
1
School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2
State Key Laboratory of High Field Laser Physics, Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
A mode-locked (ML) picosecond ytterbium-doped thin disk laser using a monolayer
MoS
2
as the saturable absorber (SA) is demonstrated. The monolayer
MoS
2
is fabricated through the method of low-pressure chemical vapor deposition. The laser directly produces stable ML picosecond pulses at a slope efficiency of 9.71%. The maximum output power is approximately 890 mW, while the corresponding repetition, pulse energy, and pulse duration are 48.6 MHz, 18.3 nJ, and 13.1 ps, respectively. Results suggest that the monolayer
MoS
2
is a promising SA for ultrafast lasers system.
140.4050
Mode-locked lasers
140.3615
Lasers, ytterbium
140.3480
Lasers, diode-pumped
PDF全文
Full Text
Chinese Optics Letters
2017, 15(4): 041401
Lasers and laser optics
307 W high-power 1018 nm monolithic tandem pump fiber source with effective thermal management
Xiaolong Chen
1
Jianhua Wang
2
Xiang Zhao
1,3
Gang Bai
1,3
[ ... ]
Jun Zhou
1
Author Affiliations
Abstract
1
Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Research Center of Space Laser Information Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
Department of Space and Command, Academy of Equipment, Beijing 101416, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
Huazhong University of Science and Technology, Wuhan 430073, China
We report a 307 W 1018 nm Yb-doped fiber laser pumped by a single 976 nm laser diode. The cavity slope efficiency is up to 75.9% and the amplified spontaneous emission is suppressed by 54 dB. The beam quality of the output laser has an
M
2
factor of 1.17. Effective thermal management is considered to ensure the stable operation of our system. The power stability at the maximum output power level is measured during a period of 0.5 h and the power fluctuation is less than 0.8%. This architecture can be an effective high brightness pump source of core-pumping high-power fiber amplifiers.
140.3510
Lasers, fiber
140.3615
Lasers, ytterbium
140.6810
Thermal effects
PDF全文
Full Text
Chinese Optics Letters
2017, 15(7): 071407
Lasers and laser optics
Laser performance of a broadband wavelength tunable Yb:germanophosphate glass with direct diode pumping
Download:779次
Hai Yu
1,4
Yaqiao Liu
1
Jie Guo
1,4
Liyan Zhang
2
[ ... ]
Xiaoyan Liang
1,3,*
Author Affiliations
Abstract
1
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3
School of Physical Science and Technology, Shanghai Tech University, Shanghai 200031, China
4
University of Chinese Academy of Sciences, Beijing 100049, China
The laser performance of a new Yb:germanophosphate (Yb:GP) glass is investigated. A maximum output power of 826 mW at 1063 nm is achieved with direct diode pumping at 976 nm. The wavelength is tuned from 1034.47 to 1070.83 nm, corresponding to a tuning range of 36.36 nm. Thermal lens effects are investigated to optimize the optical cavity.
140.3580
Lasers, solid-state
140.3615
Lasers, ytterbium
140.3600
Lasers, tunable
PDF全文
Full Text
Chinese Optics Letters
2017, 15(7): 071406
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