scholarly journals All-Fiber Tunable Pulsed 1.7 μm Fiber Lasers Based on Stimulated Raman Scattering of Hydrogen Molecules in Hollow-Core Fibers

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4561
Author(s):  
Wenxi Pei ◽  
Hao Li ◽  
Wei Huang ◽  
Meng Wang ◽  
Zefeng Wang
Keyword(s):  
Raman Scattering ◽  
Fiber Lasers ◽  
Stimulated Raman Scattering ◽  
Fiber Amplifier ◽  
Solid Core ◽  
Hollow Core ◽  
Average Output ◽  
Hydrogen Molecules ◽  
Stokes Waves ◽  
Stimulated Raman

Fiber lasers that operate at 1.7 μm have important applications in many fields, such as biological imaging, medical treatment, etc. Fiber gas Raman lasers (FGRLs) based on gas stimulated Raman scattering (SRS) in hollow-core photonic crystal fibers (HC-PCFs) provide an elegant way to realize efficient 1.7 μm fiber laser output. Here, we report the first all-fiber structure tunable pulsed 1.7 μm FGRLs by fusion splicing a hydrogen-filled HC-PCF with solid-core fibers. Pumping with a homemade tunable pulsed 1.5 μm fiber amplifier, efficient 1693~1705 nm Stokes waves are obtained by hydrogen molecules via SRS. The maximum average output Stokes power is 1.63 W with an inside optical–optical conversion efficiency of 58%. This work improves the compactness and stability of 1.7 μm FGRLs, which is of great significance to their applications.

scholarly journals Hydrogen Molecules Rotational Stimulated Raman Scattering in All-Fiber Cavity Based on Hollow-Core Photonic Crystal Fibers

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 711
Author(s):  
Wenxi Pei ◽  
Hao Li ◽  
Wei Huang ◽  
Meng Wang ◽  
Zefeng Wang
Keyword(s):  
Photonic Crystal ◽  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Photonic Crystal Fibers ◽  
Stokes Wave ◽  
Hollow Core ◽  
Hydrogen Molecules ◽  
Gas Cavity ◽  
Crystal Fibers ◽  
Stimulated Raman

Here, we report the rotational stimulated Raman scattering (SRS) of hydrogen molecules in an all-fiber cavity based on hollow-core photonic crystal fibers (HC-PCFs). The gas cavity consists of a 49 m long HC-PCF filled with 18 bar high-pressure hydrogen and two sections of fusion spliced solid-core fibers on both ends. When pumped by a homemade 1064 nm pulsed fiber amplifier, only rotational SRS occurs in the gas cavity due to the transmission spectral characteristics of the used HC-PCF, and 1135 nm Stokes wave is obtained (Raman frequency shift of 587 cm−1). By changing the pulse width and repetition frequency of the pump source, the output characteristics are explored. In addition, a theoretical model is established for comparison with the experimental results. This work is helpful for the application of gas Raman laser based on the HC-PCFs.

Investigation of stimulated Raman scattering in a mode-locked ytterbium-doped fiber amplifier setup

Laser Physics ◽  
2019 ◽  
Vol 29 (9) ◽  
pp. 095101
Author(s):  
Nitish Paul ◽  
C P Singh ◽  
P K Gupta ◽  
P K Mukhopadhyay ◽  
K S Bindra
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Fiber Amplifier ◽  
Stimulated Raman

scholarly journals Mitigation of stimulated Raman scattering in kilowatt-level diode-pumped fiber amplifiers with chirped and tilted fiber Bragg gratings

2019 ◽  
Vol 7 ◽  
Author(s):  
Meng Wang ◽  
Le Liu ◽  
Zefeng Wang ◽  
Xiaoming Xi ◽  
Xiaojun Xu
Keyword(s):  
Raman Scattering ◽  
Fiber Lasers ◽  
Stimulated Raman Scattering ◽  
Beam Quality ◽  
Average Power ◽  
Fiber Amplifiers ◽  
Maximum Output ◽  
Power Scaling ◽  
Diode Pumped ◽  
Stimulated Raman

The average power of diode-pumped fiber lasers has been developed deeply into the kW regime in the past years. However, stimulated Raman scattering (SRS) is still a major factor limiting the further power scaling. Here, we have demonstrated the mitigation of SRS in kilowatt-level diode-pumped fiber amplifiers using a chirped and tilted fiber Bragg grating (CTFBG) for the first time. The CTFBG is designed and inscribed in large-mode-area (LMA) fibers, matching with the operating wavelength of the fiber amplifier. With the CTFBG inserted between the seed laser and the amplifier stage, an SRS suppression ratio of ${\sim}10~\text{dB}$ is achieved in spectrum at the maximum output laser power of 2.35 kW, and there is no reduction in laser slope efficiency and degradation in beam quality. This work proves the feasibility and practicability of CTFBGs for SRS suppression in high-power fiber lasers, which is very useful for the further power scaling.

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