High-power 1560 nm single-frequency erbium fiber amplifier core-pumped at 1480 nm

Cheng, Xin; Lin, Zheshuai; Yang, Xuezong; Cui, Shuizhen; Zeng, Xiangfeng; Jiang, Huawei; Feng, Yan

doi:10.1017/hpl.2023.6

Cited by 14 publications

(4 citation statements)

References 36 publications

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“…These imperfections lead to a rapid increase in fiber-end reflectivity. Studies have shown that the error of surface roughness and angles resulting from precision machining is 20 dB more than the theoretical value [16]. Therefore, when cutting the fiber-end surface, the insertion loss should be increased by more than 60 dB by matching the refractive index of the outside medium and fiber core.…”

Section: Principles Of Fiber-end Antireflectionmentioning

confidence: 99%

Fiber-end antireflection method for ultra-weak fiber Bragg grating sensing systems

Zhi-Quan

Zhang

Cheng

et al. 2021

Meas. Sci. Technol.

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A novel fiber-end antireflection method for reducing the reflection noise in ultra-weak fiber Bragg grating (FBG) sensing systems is proposed in this study. The principle of fiber-end antireflection is analyzed and simulated theoretically, and then an antireflection structure is designed and fabricated. In this method, the fiber end is cut into an inclined surface and covered directly with an ellipsoid photosensitive ultraviolet (UV) glue drop, whose refractive index is similar to that of the fiber core. Under the online monitoring of the fiber-end reflection with the ultra-weak FBG interrogator, the refractive index of the glue drop is adjusted by controlling the UV curing time to achieve optimal reflection suppression. Results show that this method can reduce fiber-end reflection to less than −60 dB and effectively eliminate the influence of fiber-end reflection noise on the last sensor. The proposed method thus provides an excellent solution for the fiber-end processing of ultra-weak FBG sensing systems.

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Section: Principles Of Fiber-end Antireflectionmentioning

confidence: 99%

Fiber-end antireflection method for ultra-weak fiber Bragg grating sensing systems

Zhi-Quan

Zhang

Cheng

et al. 2021

Meas. Sci. Technol.

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“…Another limiting factor of the EYDF-based SFFA is the serious thermal issue that arises from its significant quantum defect, which is nearly ∼40% [72,73] . To address this problem, tandem pumping the amplifier at ∼1480 nm with Raman fiber amplifiers or erbium-doped fiber amplifiers (EDFAs) at ∼1530 nm would be helpful, although currently the achievable output power is limited by the available pump power [74,75] . In addition, it is noted that the SBS is currently not the major restriction for the power scaling of 1.5 μm SFFAs, with which the TMI effect has not even been experimentally observed.…”

Section: Free-space Couplingmentioning

confidence: 99%

High-power single-frequency fiber amplifiers: progress and challenge [Invited]

Li,

Tao,

Jiang

et al. 2023

中国光学快报

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Unlike conventional continuous-wave lasers with wide spectra, the amplification of single-frequency lasers in optical fibers is much more difficult owing to the ultra-high power spectral density induced nonlinear stimulated Brillouin scattering effect. Nevertheless, over the past two decades much effort has been devoted to improving the power scaling and performance of high-power single-frequency fiber amplifiers. These amplifiers are mostly driven by applications, such as high precision detection and metrology, and have benefited from the long coherence length, low noise, and excellent beam quality of this type of laser source. In this paper, we review the overall development of high-power single-frequency fiber amplifiers by focusing on its progress and challenges, specifically, the strategies for circumventing the stimulated Brillouin scattering and transverse mode instability effects that, at present, are the major limiting factors of the power scaling of the single-frequency fiber amplifiers. These factors are also thoroughly discussed in terms of free-space and all-fiber coupled architecture. In addition, we also examine the noise properties of single-frequency fiber amplifiers, along with corresponding noise reducing schemes. Finally, we briefly envision the future development of high-power single-frequency fiber amplifiers.

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“…High-power narrow linewidth single-frequency lasers have attracted extensive interest due to their superior characteristics in some fields, such as gravitational wave detection [1] , quantum information optics [2] , atomic physics [3] and nonlinear frequency conversion [4][5][6] . The most widely used approaches to obtain high-power narrow linewidth lasers are master oscillator power amplification (MOPA) structures based on low-power narrow linewidth seeds [7,8] and single-cavity structures with direct high-power output [9,10] . However, in MOPA systems, aside from the problems of beam quality deterioration and mode instability due to thermal accumulation [11] , the linewidth broadening introduced by spontaneous radiation during the amplification process cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

Linewidth narrowing in free-space running diamond Brillouin lasers

Jin

Bai

Zhao

et al. 2023

High Pow Laser Sci Eng

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This study analyzes the linewidth narrowing characteristics of free-space-running Brillouin lasers and investigates the approaches to achieve linewidth compression and power enhancement simultaneously. The results show that the Stokes linewidth behavior in a free-space-running Brillouin laser cavity is determined by the phase diffusion of the pump and the technical noise of the system. Experimentally, a Stokes light output with a power of 22.5 W and a linewidth of 3.2 kHz was obtained at a coupling mirror reflectivity of 96%, which is nearly 2.5 times compressed compared with the linewidth of the pump (7.36 kHz). In addition, the theorical analysis shows that at a pump power of 60 W and a coupling mirror reflectivity of 96%, a Stokes output with a linewidth of 1.6 kHz and up to 80% optical conversion efficiency can be achieved by reducing the insertion loss of the intracavity. This study provides a promising technical route to achieve high-power ultra-narrow linewidth special wavelength laser radiations.

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High-power 1560 nm single-frequency erbium fiber amplifier core-pumped at 1480 nm

Cited by 14 publications

References 36 publications

Fiber-end antireflection method for ultra-weak fiber Bragg grating sensing systems

Fiber-end antireflection method for ultra-weak fiber Bragg grating sensing systems

High-power single-frequency fiber amplifiers: progress and challenge [Invited]

Linewidth narrowing in free-space running diamond Brillouin lasers

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