Experiments With Stimulated Raman Scattering For Wavelength Conversion And Beam Quality Control

1987 ◽  
Author(s):  
S. F. Fulghum ◽  
A. Flusberg ◽  
D. W. Trainor ◽  
D. Klimek ◽  
C. Duzy ◽  
...  
Keyword(s):  
Quality Control ◽  
Raman Scattering ◽  
Wavelength Conversion ◽  
Stimulated Raman Scattering ◽  
Beam Quality ◽  
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.

STIMULATED RAMAN SCATTERING IN MULTI-MODE FIBERS AND ITS APPLICATION TO BEAM CLEANUP AND COMBINING

2002 ◽  
Vol 11 (03) ◽  
pp. 303-316 ◽  
Author(s):  
TIMOTHY H. RUSSELL ◽  
SHAWN M. WILLIS ◽  
MATTHEW B. CROOKSTON ◽  
WON B. ROH
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Brillouin Scattering ◽  
Beam Quality ◽  
Potential Utility ◽  
Stimulated Brillouin ◽  
Multi Mode ◽  
Raman Beam ◽  
Stokes Beam ◽  
Stimulated Raman

Laser beam cleanup properties of stimulated Raman scattering (SRS) in a multi-mode fiber have been characterized. It is shown that a fiber, which supports propagation of a highly aberrated pump beam, can generate a Gaussian-like Stokes beam consisting of one or more orders of Stokes components. The beam cleanup properties are found to be similar to those of stimulated Brillouin scattering, which are briefly reviewed herein. The dramatic enhancement in beam quality achievable through SRS clearly demonstrates the potential utility of fiber-based Raman beam cleanup/combining devices for laser brightness scaling.

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