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Lasers and laser optics
Laser diode partially end-pumped electro-optically
Q
-switched Yb:YAG slab laser
Download:744次
Qian Gao
Hengli Zhang
*
Javed Fayyaz
Author Affiliations
Abstract
School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
A laser diode partially end-pumped, electro-optically
Q
-switched, Yb:Y
3
Al
5
O
12
(Yb:YAG) slab laser was reported. We obtained output energy of 14.6 mJ/pulse with a pulse width of 30 ns at a repetition frequency of 2 kHz, and the corresponding peak power was 480 kW. The beam quality factors
M
2
in the unstable direction and the stable direction was 1.32 and 1.25, respectively.
140.3480
Lasers, diode-pumped
230.0230
Optical devices
PDF全文
Full Text
Chinese Optics Letters
2019, 17(11): 111405
Lasers and laser optics
1514 nm eye-safe passively
Q
-switched self-optical parametric oscillator based on Nd
3+
-doped MgO:PPLN
Heyan Liu
1
Yongji Yu
1,*
Dehui Sun
2
Hong Liu
2
[ ... ]
Guangyong Jin
1
Author Affiliations
Abstract
1
Jilin Key Laboratory of Solid Laser Technology and Application, School of Science, Changchun University of Science and Technology, Changchun 130022, China
2
Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan 250022, China
We examined a 1514 nm eye-safe passively
Q
-switched self-optical parametric oscillator. The nonlinear crystal is an
a
-cut Nd:MgO:PPLN crystal, and the size of the crystal was 6 mm × 2 mm × 30 mm with 0.4 at.% Nd
3+
doped and a grating period of 29.8 μm. When the crystal absorbed 12.8 W, the output maximum single-pulse energy reached 39 μJ, and a pulse width of 6.1 ns at a repetition rate of 5.4 kHz was obtained. The peak power was 6 kW, giving a slope efficiency of 42%.
140.3540
Lasers, Q-switched
190.4970
Parametric oscillators and amplifiers
140.3480
Lasers, diode-pumped
140.3460
Lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(11): 111404
Lasers and laser optics
Highly efficient electro-optically
Q
-switched 473 nm blue laser
Tingting Lu
Jian Ma
Xiaolei Zhu
*
Weibiao Chen
Author Affiliations
Abstract
Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
An external frequency doubling electro-optically
Q
-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) 473 nm blue laser was demonstrated. With absorbed pump energy of 48 mJ at 100 Hz repetition rate, about 2 mJ of 473 nm blue laser pulse energy was achieved by cascade frequency doubling. The second harmonic conversion efficiency was 64.5%, and overall optical-optical efficiency was 4.2%, respectively. The blue laser pulse width was less than 10 ns, and beam quality factor was less than 2.4.
140.3540
Lasers, Q-switched
140.3515
Lasers, frequency doubled
140.3530
Lasers, neodymium
140.3480
Lasers, diode-pumped
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 051405
Lasers and laser optics
LG
11
-mode vortex Nd:YAG laser by applying second-order circular Dammann grating for annular pumping
Download:836次
Quan Zhang
1,2
Junjie Yu
1
Biran Shi
1,2
Fanchun Tang
1,2
Jianlang Li
1,*
Author Affiliations
Abstract
1
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
The excitation of high-order Laguerre–Gaussian (LG) modes in a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser resonator was presented by applying the diffraction of a second-order circular Dammann grating (CDG) for annular pumping. In the study, the 808 nm pump light was shaped into a double-ring structure by the CDG and matched spatially with that of an ideal LG
11
mode. As a result, the laser resonator generated an LG
11
vortex mode, and the laser power reached 204 mW with 14.5% slope efficiency. Also, when the cavity mirror was tilted, the laser output could switch to the LG
01
vortex mode. The results showed the convenience and versatility of CDG in an annular-pumped vortex laser.
140.3580
Lasers, solid-state
140.3480
Lasers, diode-pumped
050.1950
Diffraction gratings
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 051402
Lasers and laser optics
Watt-level continuous-wave and passively
Q
-switched red lasers pumped by a single blue laser diode
Download:845次
Yuxia Zhang
1
Yilun Yang
2
Lianhan Zhang
2
Dazhi Lu
1
[ ... ]
Huaijin Zhang
1,**
Author Affiliations
Abstract
1
State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China
2
Key Laboratory of High Power Laser Materials, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3
College of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
Praseodymium-ion-doped gain materials have the superiority of lasing at various visible wavelengths directly. Simple and compact visible lasers are booming with the development of blue laser diodes in recent years. In this Letter, we demonstrate the watt-level red laser with a single blue laser diode and Pr:YLiF
4
crystal. On this basis, the passively
Q
-switched pulse lasers are obtained with monolayer graphene and Co:ZnO thin film as the
Q
-switchers in the visible range.
140.3480
Lasers, diode-pumped
140.3540
Lasers, Q-switched
140.7300
Visible lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(7): 071402
Lasers and laser optics
1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system
Cover Paper
Download:1555次
Licheng Sun
1
Tinghao Liu
1
Xing Fu
1
Yading Guo
2
[ ... ]
Lei Huang
1,*
Author Affiliations
Abstract
1
Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
2
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
In this Letter, a 116-actuator deformable mirror (DM) was used to correct the wavefront distortion in a 10.7 J, 10 Hz neodymium-doped yttrium aluminum garnet (Nd:YAG) slab amplifier. By applying a pump-light homogenizer to transform the 3 × 1 near-field beam array into an integrated beam, the beam quality was greatly improved from 5.54 times diffraction limit (TDL) to 1.57 TDL after being corrected by the DM. To the best of our knowledge, this is the first investigation on beam quality control of an arrayed near-field beam in high-energy diode-pumped solid-state lasers.
140.3280
Laser amplifiers
140.3480
Lasers, diode-pumped
220.1080
Active or adoptive optics
220.1000
Aberration compensation
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 051403
Lasers and laser optics
Gold nanorods as saturable absorbers for the passively
Q
-switched Nd:LLF laser at 1.34 μm
Qizhang Qian
1
Nan Wang
2
Shengzhi Zhao
1
Guiqiu Li
1,*
[ ... ]
Houyi Ma
2
Author Affiliations
Abstract
1
School of Information Science and Engineering, and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao 266237, China
2
Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Gold nanorods (GNRs) with two different aspect ratios were successfully utilized as saturable absorbers (SAs) in a passively
Q
-switched neodymium-doped lutetium lithium fluoride (Nd:LLF) laser emitting at 1.34 μm. Based on the GNRs with an aspect ratio of five, a maximum output power of 1.432 W was achieved, and the narrowest pulse width was 328 ns with a repetition rate of 200 kHz. But, in the case of the GNRs with the aspect ratio of eight, a maximum output power of 1.247 W was achieved, and the narrowest pulse width was 271 ns with a repetition rate of 218 kHz. Our experimental results reveal that the aspect ratios of GNRs have different saturable absorption effects at a specific wavelength. In other words, for passively
Q
-switched lasers at a given wavelength, we are able to select the most suitable GNRs as an SA by changing their aspect ratio.
140.3480
Lasers, diode-pumped
140.3540
Lasers, Q-switched
140.3070
Infrared and far-infrared lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(4): 041401
Extraordinary 2D Materials Based Nanophotonics
Active–passive pulse laser based on gold nanobipyramids at 1.3 μm wavelength
Cong Wang
1
Qianqian Peng
1
Linlin Xin
2,*
Jie Liu
1,**
Author Affiliations
Abstract
1
Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
2
Department of Dermatology, Qianfoshan Hospital of Shandong Province, Jinan 250014, China
Two-dimensional (2D) materials have attracted intense attention in photonics and optoelectronics for their excellent nonlinear characteristics and are applied for the generation of laser pulses. Here, an active–passive
Nd
:
GdVO
4
1.3
μ
m
laser is realized by using an acousto-optic modulator and gold nanobipyramids absorber. The pulse width of 150.5 ns is obtained in the doubly
Q
-switched laser. The compression ratio and enhancement time are 82.6% and 16. The doubly
Q
-switched technology compresses the pulse width, improves the peak power, and stabilizes the pulse, illustrating that double modulation technology opens the door of controllable ultrafast lasers based on 2D materials.
140.3070
Infrared and far-infrared lasers
140.3380
Laser materials
140.3480
Lasers, diode-pumped
PDF全文
Full Text
Chinese Optics Letters
2019, 17(2): 020003
Lasers and Laser Optics
Self-
Q
-switched and wavelength-tunable tungsten disulfide-based passively
Q
-switched Er:Y
2
O
3
ceramic lasers
Xiaofeng Guan
1
Jiawei Wang
1
Yuzhao Zhang
1
Bin Xu
1,*
[ ... ]
Jun Xu
4
Author Affiliations
Abstract
1
Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
2
Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
3
Key Laboratory of Transparent Opto-functional Inorganic Materials, Chinese Academy of Sciences, Shanghai 201899, China
4
School of Physics Science and Engineering, Institute for Advanced Study, Tongji University, Shanghai 200092, China
5
e-mail: xdxu79@mail.sic.ac.cn
We report on diode-pumped
Er
:
Y
2
O
3
ceramic lasers at about 2.7 μm in the tunable continuous-wave, self-
Q
-switching and tungsten disulfide (
WS
2
)-based passively
Q
-switching regimes. For stable self-
Q
-switched operation, the maximum output power reaches 106.6 mW under an absorbed power of 2.71 W. The shortest pulse width is measured to be about 1.39 μs at a repetition rate of 26.7 kHz at maximum output. Using a spin-coated
WS
2
as a saturable absorber, a passively
Q
-switched
Er
:
Y
2
O
3
ceramic laser is also realized with a maximum average output power of 233.5 mW (for the first time, to the best of our knowledge). The shortest pulse width decreases to 0.72 μs at a corresponding repetition rate of 29.4 kHz, which leads to a pulse energy of 7.92 μJ and a peak power of 11.0 W. By inserting an undoped YAG thin plate as a Fabry–Perot etalon, for the passive
Q
switching, wavelength tunings are also demonstrated at around 2710, 2717, 2727, and 2740 nm.
Lasers, diode-pumped
Lasers, Q-switched
Lasers, solid-state
PDF全文
Full Text
Photonics Research
2018, 6(9): 09000830
Lasers and Laser Optics
Experimental investigation of loss and gain characteristics of an abnormal In
x
Ga
1-x
As/GaAs quantum well structure
Yan Jia
1
Qingnan Yu
1
Fang Li
1
Mingqing Wang
1
[ ... ]
Jian Wu
1,*
Author Affiliations
Abstract
1
Department of Applied Physics, Beihang University, Beijing 100191, China
2
State Key Laboratory of Luminescence and Application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130000, China
In this Letter, the loss and gain characteristics of an unconventional
In
x
Ga
1
x
As
/
Ga
As
asymmetrical step well structure consisting of variable indium contents of
In
x
Ga
1
x
As
materials are measured and analyzed for the first time, to the best of our knowledge. This special well structure is formed based on the indium-rich effect from the material growth process. The loss and gain are obtained by optical pumping and photoluminescence (PL) spectrum measurement at dual facets of an edge-emitting device. Unlike conventional quasi-rectangle wells, the asymmetrical step well may lead to a hybrid strain configuration containing both compressive and tensile strains and, thus, special loss and gain characteristics. The results will be very helpful in the development of multiple wavelength InGaAs-based semiconductor lasers.
140.3380
Laser materials
140.3480
Lasers, diode-pumped
140.5960
Semiconductor lasers
PDF全文
Full Text
Chinese Optics Letters
2018, 16(1): 011402
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