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Lasers, Optical Amplifiers, and Laser Optics
1.6-µm single-frequency erbium-doped fiber laser based on two cascaded subrings
Yaqi Zhai
1,2
Han Wen
1,2
Haowei Chen
1,2,*
Baole Lu
1,2,**
Jintao Bai
1,2
Author Affiliations
Abstract
1
State Key Laboratory of Energy Photon-Technology in Western China, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi’an 710127, China
2
Shaanxi Engineering Technology Research Center for Solid State
Lasers
and Application, Shaanxi Provincial Key Laboratory of Photo-electronic Technology, Northwest University, Xi’an 710127, China
We demonstrate a stable narrow linewidth single-frequency erbium-doped fiber laser (EDFL) operating at 1.6 µm. A Fabry–Perot fiber Bragg grating and two cascaded subrings are incorporated in the main ring cavity to achieve single-frequency operation. The experimentally measured optical signal-to-noise ratio is greater than 73 dB. Furthermore, the linewidth of the EDFL is measured to be about 480 Hz by the self-built short-delayed self-heterodyne interferometry device. The laser shows superior stability, with no mode-hopping during the 60-min observation period. The proposed EDFL provides a new experimental idea for realizing a single-frequency fiber laser in the L-band.
erbium-doped fiber laser
two cascaded subrings
single frequency
PDF全文
Full Text
Chinese Optics Letters
2024, 22(4): 041406
Lasers, Optical Amplifiers, and Laser Optics
Design of a high frequency accuracy heterodyne laser source working in a wide temperature range
Hongxing Yang
1,2
Yan Wang
1,2
Ziqi Yin
1,2
Pengcheng Hu
1,2,*
[ ... ]
Jing Li
1,2
Author Affiliations
Abstract
1
Center of Ultra-precision Optoelectronic Instrument, Harbin Institute of Technology, Harbin 150080, China
2
Key Laboratory of Ultra-precision Intelligent Instrumentation (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150080, China
To ensure the frequency accuracy of a heterodyne laser source in the ambient temperature range of -20°C to 40°C, a dual-longitudinal-mode thermally stabilized He–Ne laser based on non-equilibrium power locking was designed. The ambient adaptive preheating temperature setting scheme ensured the laser could operate normally in the range of -20°C to 40°C. The non-equilibrium power-locked frequency stabilization scheme compensated for the frequency drift caused by different stabilization temperatures. The experimental results indicated that the frequency accuracy of the laser designed in this study could reach 5.2 × 10
-9
in the range of -20°C to 40°C.
He–Ne laser
frequency accuracy
ambient adaptability
non-equilibrium power locking
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Chinese Optics Letters
2024, 22(4): 041407
Lasers, Optical Amplifiers, and Laser Optics
Dynamic range expansion for optical frequency shift detection based on multiple harmonics
Yanru Zhou
1,2,*
Lifan Fan
1,3
Kai Xu
1,3
Wenyao Liu
1,3
[ ... ]
Jun Liu
1,3,**
Author Affiliations
Abstract
1
State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, China
2
School of Information & Communication Engineering, North University of China, Taiyuan 030051, China
3
School of Instrument & Electronics, North University of China, Taiyuan 030051, China
Sensors based on optical resonators often have their measurement range limited by their cavity linewidth, particularly in the measurement of time-varying signals. This paper introduces a method for optical frequency shift detection using multiple harmonics to expand the dynamic range of sensors based on optical resonators. The proposed method expands the measurement range of optical frequency shift beyond the cavity linewidth while maintaining measurement accuracy. The theoretical derivation of this method is carried out based on the equation of motion for an optical resonator and the recursive relationship of the Bessel function. Experimental results show that the dynamic range is expanded to 4 times greater than the conventional first harmonic method while still maintaining accuracy. Furthermore, we present an objective analysis of the correlation between the expansion factor of the method and the linewidth and free spectrum of the optical resonator.
optical resonator
optical frequency shift
multiple harmonics
dynamic range expansion
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Chinese Optics Letters
2024, 22(4): 041201
Lasers, Optical Amplifiers, and Laser Optics
5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber
Yisha Chen
1,2,3
Yun Ye
1,2,3
Liangjin Huang
1,2,3,*
Huan Yang
1,2,3
[ ... ]
Pu Zhou
1
Author Affiliations
Abstract
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China
3
Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China
A low-numerical-aperture (NA) concept enables large-mode-area fiber with better single-mode operation ability, which is beneficial for transverse mode instability and nonlinear effects suppression. In this contribution, we reported a high-power fiber amplifier based on a piece of self-developed large-mode-area low-NA fiber with a core NA of 0.049 and a core/inner cladding diameter of 25/400 µm. The influence of the pump wavelength and fiber length on the power scaling potential of the fiber amplifier is systematically investigated. As a result, an output of 4.80 kW and a beam quality factor of ∼1.33 were finally obtained, which is the highest output power ever reported in a fiber amplifier exploiting the low-NA fiber. The results reveal that low-NA fibers have superiority in power scaling and beam quality maintenance at high power levels.
high power fiber lasers
ytterbium-doped fiber
low-numerical-aperture fiber
mode instability
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Chinese Optics Letters
2024, 22(4): 041404
Lasers, Optical Amplifiers, and Laser Optics
Eye-safe intra-cavity diamond cascaded Raman laser with high peak-power and narrow linewidth
Xiaobo Mi
1
Chaonan Lin
1
Yongsheng Hu
1,*
Houjie Ma
1
[ ... ]
Chongxin Shan
1,***
Author Affiliations
Abstract
1
School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
2
College of Physics Science and Technology, Institute of Applied Photonic Technology, Yangzhou University, Yangzhou 225002, China
The 1.4–1.8 µm eye-safe lasers have been widely used in the fields of laser medicine and laser detection and ranging. The diamond Raman lasers are capable of delivering excellent characteristics, such as good beam quality concomitantly with high output power. The intra-cavity diamond Raman lasers have the advantages of compactness and low Raman thresholds compared to the external-cavity Raman lasers. However, to date, the intra-cavity diamond cascaded Raman lasers in the spectral region of the eye-safe laser have an output power of only a few hundred milliwatts. A 1485 nm Nd:YVO
4
/diamond intra-cavity cascaded Raman laser is reported in this paper. The mode matching and stability of the cavity were optimally designed by a V-shaped folded cavity, which yielded an average output power of up to 2.2 W at a pulse repetition frequency of 50 kHz with a diode to second-Stokes conversion efficiency of 8.1%. Meanwhile, the pulse width of the second-Stokes laser was drastically reduced from 60 ns of the fundamental laser to 1.1 ns, which resulted in a high peak power of 40 kW. The device also exhibited single longitudinal mode with a narrow spectral width of < 0.02 nm.
diamond
intra-cavity
Raman lasers
eye-safe lasers
high peak-power
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Chinese Optics Letters
2024, 22(4): 041402
Lasers, Optical Amplifiers, and Laser Optics
High-power all-fiber linearly polarized Yb-doped chirped pulse amplifier based on active polarization control
Tao Wang
1
Shuai Ren
1,2
Hongxiang Chang
1
Bo Ren
1
[ ... ]
Pu Zhou
1,**
Author Affiliations
Abstract
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
School of Information and Communications, National University of Defense Technology, Wuhan 430035, China
3
Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China
4
Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China
High-power ultrafast laser amplification based on a non-polarization maintaining fiber chirped pulse amplifier is demonstrated. The active polarization control technology based on the root-mean-square propagation (RMS-prop) algorithm is employed to guarantee a linearly polarized output from the system. A maximum output power of 402.3 W at a repetition rate of 80 MHz is realized with a polarization extinction ratio (PER) of > 11.4 dB. In addition, the reliable operation of the system is verified by examining the stability and noise properties of the amplified laser. The M
2
factor of the laser beam at the highest output power is measured to be less than 1.15, indicating a diffraction-limited beam quality. Finally, the amplified laser pulse is temporally compressed to 755 fs with a highest average power of 273.8 W. This is the first time, to the best of our knowledge, that the active polarization control technology was introduced into the high-power ultrafast fiber amplifier.
active polarization control
root-mean-square propagation algorithm
linearly polarized laser
chirped pulse amplification
femtosecond laser
fiber laser
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Chinese Optics Letters
2024, 22(4): 041403
Lasers, Optical Amplifiers, and Laser Optics
Stable ultraviolet ultrafast laser based on all-polarization-maintaining fiber femtosecond laser
Hao Tian
1
Zhe Zhu
1
Wei Lin
1
Zihao Li
1
[ ... ]
Zhongmin Yang
1,2,**
Author Affiliations
Abstract
1
School of Physics and Optoelectronics; State Key Laboratory of Luminescent Materials and Devices, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510640, China
2
Research Institute of Future Technology, South China Normal University, Guangzhou 510006, China
We report a high-stability ultrafast ultraviolet (UV) laser source at 352 nm by exploring an all-fiber, all-polarization-maintaining (all-PM), Yb-doped femtosecond fiber laser at 1060 nm. The output power, pulse width, and optical spectrum width of the fiber laser are 6 W, 244 fs, and 17.5 nm, respectively. The UV ultrashort pulses at a repetition rate of 28.9 MHz are generated by leveraging single-pass second-harmonic generation in a 1.3-mm-long BiB
3
O
6
(BIBO) and sum frequency generation in a 5.1-mm-long BIBO. The maximum UV output power is 596 mW. The root mean square error of the output power of UV pulses is 0.54%. This laser, with promising stability, is expected to be a nice source for frontier applications in the UV wavelength window.
all-polarization-maintaining fiber
ultrafast fiber laser
UV laser
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Chinese Optics Letters
2024, 22(3): 031404
Lasers, Optical Amplifiers, and Laser Optics
22 kW near-diffraction-limited Yb:YAG slab laser amplifier without adaptive optics correction
Dan Wang
1,2,3,*
Ping He
2
Tangjian Zhou
2
Mi Li
2
[ ... ]
Rihong Zhu
1
Author Affiliations
Abstract
1
School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2
Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 430079, China
3
Graduate School of China Academy of Engineering Physics, Beijing 100193, China
A high-power CW Yb:YAG slab laser amplifier with no adaptive optics correction has been experimentally established. At room temperature, the amplifier emits a power of 22 kW with an average beam quality (
β
) of less than 3 in 0.5 min. To our knowledge, this is the brightest slab laser without closed-loop adaptive optics demonstrated to date. In addition, an extracted power of 17 kW with an optical extraction efficiency of 33%, corresponding to a residual optical path difference of less than 0.5 µm, is achieved with the single Yb:YAG slab gain module. The slab gain module has the potential to be scalable to higher powers while maintaining good beam quality. This makes a high-power solid-state laser system simpler and more robust.
laser amplifier
Yb:YAG
slab laser
surface quality
pumping uniformity
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Chinese Optics Letters
2024, 22(3): 031402
Lasers, Optical Amplifiers, and Laser Optics
Power output correction model of narrow linewidth ring fiber laser filtered with whispering gallery mode resonator
Ziyun Wang
1,2
Zaibin Xu
1,2
Jiwen Cui
1,2,*
Jiubin Tan
1,2
Author Affiliations
Abstract
1
Center of Ultra-precision Optoelectronic Instrument, Harbin Institute of Technology, Harbin 150080, China
2
Key Laboratory of Ultra-precision Intelligent Instrumentation, Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150080, China
A whispering gallery mode resonator (WGMR) filter can narrow laser linewidth while significantly changing the output power characteristics of fiber laser system. It is found that traditional laser output power model is invalid. We report a correction model of a narrow linewidth fiber laser filtered with a WGMR to analyze its power. We believe that the loss of the laser system and the threshold gain increase caused by the WGMR filter lead to the predominate amplified spontaneous emission during the original laser period. According to that, we assume the correction coefficient is an exponential decay related to the Er-doped fiber length in the large loss situation, and we verify it experimentally. As a result, the correction model is valid for WGMR-filtered fiber laser.
whispering gallery resonator filter
narrow linewidth fiber laser
power output correction model
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Chinese Optics Letters
2024, 22(3): 031401
Lasers, Optical Amplifiers, and Laser Optics
Bright/dark switchable mode-locked fiber laser based on alcohol
Wenyan Zhang
1,*
Huijie Jiang
1
Kun Yang
1
Nannan Liu
1
[ ... ]
Li Zhan
2,**
Author Affiliations
Abstract
1
Henan Key Laboratory of Magnetoelectronic Information Functional Materials, School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
2
State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
A passively switchable erbium-doped fiber laser based on alcohol as the saturable absorber (SA) has been demonstrated. The SA is prepared by filling the gap between two optical patch cords with alcohol to form a sandwich structure. The modulation depth of the alcohol–SA is measured to be 6.4%. By appropriately adjusting the pump power and the polarization state in the cavity, three kinds of mode-locked pulse patterns can be achieved and switched, including bright pulse, bright/dark soliton pair, and dark pulse. These different soliton emissions all operate at the fundamental frequency state, with a repetition rate of 20.05 MHz and a central wavelength of ∼1563 nm. To the best of our knowledge, this is the first demonstration of a switchable soliton fiber laser using alcohol as the SA. The experimental results further indicate that organic liquid-like alcohol has great potential for constructing ultrafast lasers.
optical solitons
fiber lasers
alcohol
pulsed lasers
PDF全文
Full Text
Chinese Optics Letters
2024, 22(3): 031403
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