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Advanced Imaging
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Lasers and Laser Optics
Mode-locked pulse generation from an all-FMF ring laser cavity
Download:777次
Su Chen
Weixiang Hu
Yang Xu
Yu Cai
[ ... ]
Zuxing Zhang
*
Author Affiliations
Abstract
Advanced Photonic Technology Laboratory, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Experimental generation of stable mode-locked pulses and cylindrical vector beams (CVBs), from an all few-mode fiber (FMF) ring laser is first reported, to the best of our knowledge. In this laser, a section of few-mode erbium-doped fiber (FM-EDF) is used as the gain medium. The FM-EDF is pumped by 976 nm laser with LP
11
mode, which is simultaneously converted and multiplexed through a homemade hybrid device, i.e., wavelength division multiplexing-mode selection coupler (WDM-MSC). All the components in our experiment are connected using FMF. The resulted CVB pulses have a spectral width of 0.33 nm with a repetition rate of 30.58 MHz under the pump power of 340 mW. Moreover, both azimuthally and radially polarized CVBs were achieved with a high purity of >95%. This mode-locked CVB fiber laser with an all FMF configuration opens the way to manipulate the transverse mode in mode-locked fiber lasers.
140.3300
Laser beam shaping
060.3510
Lasers, fiber
140.7090
Ultrafast lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(12): 121405
Fiber Optics and Optical Communications
Ultra-broadband highly efficient mode converter at 1 μm fabricated by a line-focused CO
2
laser
Xin Tian
1,2,3
Hao Li
1,2,3
Le Liu
1,2,3
Meng Wang
1,2,3
[ ... ]
Zefeng Wang
1,2,3,*
Author Affiliations
Abstract
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
3
Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
We report here an ultra-broadband linearly polarized (LP) LP
01
LP
11
mode converter operating at 1 μm based on a long period fiber grating (LPFG) fabricated in a conventional two-mode fiber (TMF) by a line-focused CO
2
laser. The measured 3 dB bandwidth is about 240 nm, which is the broadest bandwidth for such fiber mode converters. The maximum conversion efficiency between the LP
01
and LP
11
modes is >99% over the range of 1000 nm to 1085 nm, almost covering the whole emission band of Yb
3+
, which is useful for further power scaling of high-power fiber lasers operating at the 1 μm band.
060.2340
Fiber optics components
060.3735
Fiber Bragg gratings
060.2330
Fiber optics communications
140.3510
Lasers, fiber
PDF全文
Full Text
Chinese Optics Letters
2019, 17(12): 120602
Lasers and laser optics
Towards all-fiber structure pulsed mid-infrared laser by gas-filled hollow-core fibers
Download:774次
Wei Huang
1
Yulong Cui
1
Zhiyue Zhou
1
Zhixian Li
1
[ ... ]
Zefeng Wang
1,2,3,*
Author Affiliations
Abstract
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
3
Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
4
Luoyang Electronic Equipment Test Center of China, Key Laboratory of Electro-Optical Countermeasures Test & Evaluation Technology, Luoyang 471003, China
We report here on a diode-pumped pulsed mid-infrared laser source based on gas-filled hollow-core fibers (HCFs) towards an all-fiber structure by the tapering method. The pump laser is coupled into an acetylene-filled HCF through a tapered single-mode fiber. By precisely tuning the wavelength of the diode to match different absorption lines of acetylene near 1.5 μm, mid-infrared emission around 3.1–3.2 μm is generated. With 2 m HCFs and 3 mbar acetylene gas, a maximum average power of 130 mW is obtained with a laser slope efficiency of ~24%. This work provides a potential scheme for all-fiber mid-infrared fiber gas lasers.
140.3070
Infrared and far-infrared lasers
140.3510
Lasers, fiber
140.4130
Molecular gas lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(9): 091402
Fiber optics and optical communications
A
Q
-switched erbium-doped fiber laser based on ZrS
2
as a saturable absorber
Download:728次
Ping Hu
Yan Huang
Fangfang Liu
Ying Liu
[ ... ]
Xiaojuan Liu
*
Author Affiliations
Abstract
School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255049, China
A passively
Q
-switched erbium-doped fiber (EDF) laser is proposed and demonstrated utilizing a zirconium disulfide (ZrS
2
)-based saturable absorber (SA). ZrS
2
nanosheets are prepared, whose modulation depth, saturation intensity, and nonsaturable absorbance are measured to be 14.7%, 0.34 MW/cm
2
, and 17.4%, respectively. Then, a
Q
-switched EDF laser is implemented by the ZrS
2
-SA. The pulse repetition rate varies from 40.65 to 87.1 kHz when the pump power changes from 55 to 345 mW. The shortest pulse width is 1.49 μs with pulse energy of 33.5 nJ. As far as we know, this is the shortest pulse width obtained by a ZrS
2
-SA so far.
060.2410
Fibers, erbium
060.3510
Lasers, fiber
160.4330
Nonlinear optical materials
320.7090
Ultrafast lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(8): 080603
Letters
1.56 μm and 2.86 μm Raman lasers based on gas-filled anti-resonance hollow-core fiber
Download:723次
Wei Huang
1
Yulong Cui
1
Zhixian Li
1
Zhiyue Zhou
1
Zefeng Wang
1,2,3,*
Author Affiliations
Abstract
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
3
Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
We report here a single-pass 1.56 μm fiber gas Raman laser in a deuterium-filled hollow-core fiber and a 2.86 μm cascade fiber gas Raman laser with methane in the second stage. The maximum output powers at 1.56 and 2.86 μm are 27 and 8.5 mW with Raman conversion efficiency of 30% and 42%, respectively. The results offer a new method to produce a 1.5 μm fiber source and prove the potential of the cascade fiber gas Raman laser in extending the available wavelength.
140.3280
Laser amplifiers
140.3510
Lasers, fiber
140.3550
Lasers, Raman
140.4130
Molecular gas lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(7): 071406
Lasers and laser optics
Strain compensated robust semiconductor saturable absorber mirror for fiber lasers
Download:761次
Yan Wang
1
Nan Lin
2
Wanli Gao
1
Huanyu Song
3
[ ... ]
Zhigang Zhang
1,*
Author Affiliations
Abstract
1
State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
2
National Research Center for Optoelectronic Engineering, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100871, China
3
Ultrafast Laser Laboratory, Key Laboratory of Opto-electronic Information Technical Science of Ministry of Education, School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
4
Huakuai Photonic Technologies Inc., Zhongshan 528400, China
We demonstrate a strain compensated long lifetime semiconductor saturable absorber mirror (SESAM) with a high modulation depth for fiber lasers. The SESAM was measured to have a damage threshold of 9.5 mJ/cm
2
, a modulation depth of 11.5%, a saturation fluence of 39.3 μJ/cm
2
, and an inversed saturable absorption coefficient of 630 mJ/cm
2
. The SESAM has been applied to a linear cavity mode-locked Yb-doped fiber laser, which has been working for more than a year without damage of the SESAM.
140.4050
Mode-locked lasers
140.3510
Lasers, fiber
160.6000
Semiconductor materials
PDF全文
Full Text
Chinese Optics Letters
2019, 17(7): 071404
Lasers and laser optics
272 W quasi-single-mode picosecond pulse laser of ytterbium-doped large-mode-area photonic crystal fiber
Download:513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
60 nJ, 95 fs environmentally stable Er-doped fiber laser system
Download:651次
Peng Luo
1
Qiang Hao
1,*
Hanmei Fu
1
Heping Zeng
1,2
Author Affiliations
Abstract
1
Shanghai Key Laboratory of Modern Optical System, and Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
We demonstrate here an environmentally stable and extremely compactable Er-doped fiber laser system capable of delivering sub-100-fs temporal duration and tens of nanojoules at a repetition rate of 10 MHz. This laser source employs a semiconductor saturable absorber mirror mode-locked soliton laser to generate seed pulses. A single-mode-fiber amplifier and a double-cladding-fiber amplifier (both with double-pass configuration) are bridged by a divider and used to manage the dispersion map and boost the soliton pulses. By using 64 replicas, pulses with as high as 60 nJ energy within 95 fs duration are obtained at 10 MHz, corresponding to 600 kW peak power.
140.3500
Lasers, erbium
140.3510
Lasers, fiber
140.4480
Optical amplifiers
140.7090
Ultrafast lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(6): 061401
Ultrafast optics
All-fiber Yb:fiber frequency comb
Download:766次
Yawei Chang
Tongxiao Jiang
Zhigang Zhang
Aimin Wang
*
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication System and Networks, School of Electronics, Engineering and Computer Science, Peking University, Beijing 100871, China
We demonstrate an all-fiber Yb:fiber frequency comb with a nonlinear-amplifying-loop-mirror-based Yb:fiber laser oscillator. The fiber-spliced hollow-core photonic bandgap fiber was used as dispersion compensator, which was also directly spliced to a piece of tapered photonic crystal fiber for an octave-spanning spectrum. The spectrum of the compressed 107 fs laser pulses was broadened, covering 600 nm to 1300 nm in a high-nonlinearity tapered fiber for
f
to
2
f
beating. The signal-to-noise ratio of offset frequency was measured to be 22 dB.
320.7090
Ultrafast lasers
140.3510
Lasers, fiber
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 053201
Lasers and laser optics
High contrast linking six lasers to a 1 GHz Yb:fiber laser frequency comb
Yuxuan Ma
1
Fei Meng
1,2
Yan Wang
1
Aimin Wang
1
Zhigang Zhang
1,*
Author Affiliations
Abstract
1
State Key Laboratory of Advanced Optical Communication System and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
2
National Institute of Metrology, Beijing 100029, China
We demonstrate a 0.95 GHz repetition rate fully stabilized Yb:fiber frequency comb without optical amplification. Benefitting from the high mode power and high coherence, this comb achieved 35 to 42 dB signal to noise ratio on the direct heterodyne beat signals with at least six continuous wave lasers (at 580, 679, 698, 707, 813, and 922 nm) while keeping >40 dB carrier envelope frequency signal. It can be used for the direct measurement of optical frequencies at visible and near-infrared wavelengths and has great potential on simultaneous comparison of multiple optical frequencies.
140.3510
Lasers, fiber
320.7090
Ultrafast lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(4): 041402
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