scholarly journals Tunable Stokes Laser Based on KTiOPO4 Crystal

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 974
Author(s):  
Zecheng Wang ◽  
Xingyu Zhang ◽  
Zhenhua Cong ◽  
Zhaojun Liu ◽  
Xiaohan Chen ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Output Power ◽  
Stimulated Raman Scattering ◽  
Pulse Repetition Frequency ◽  
Maximum Output Power ◽  
Rate Equations ◽  
Stokes Wave ◽  
Maximum Output ◽  
Output Wavelength ◽  
Stimulated Raman

The characteristics of a tunable Stokes laser based on the cascaded stimulated polariton scattering and stimulated Raman scattering in KTiOPO4 crystal were studied experimentally and theoretically. When the pumping wavelength was 1064 nm, the Stokes laser output wavelength was able to be tuned discontinuously from 1112.08 nm to 1113.64 nm, from 1114.94 nm to 1115.77 nm, and from 1117.37 nm to 1119.92 nm, and the maximum output power appeared at 1118.86 nm. With a pulse repetition frequency of 7 kHz and a pump power of 6.0 W, the maximum output power of the Stokes laser reached 734 mW, and the corresponding diode to laser conversion efficiency was 12.2%. The rate equations describing the temporal evolutions of the fundamental and Stokes waves by noncollinear stimulated polariton scattering and the Stokes wave by collinear stimulated Raman scattering were derived. They were used to simulate the tunable Stokes laser. The calculated results were in agreement with the experimental results on the whole.

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.

scholarly journals Over 19 W Single-Mode 1545 nm Er,Yb Codoped All-Fiber Laser

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Jiadong Wu ◽  
Chunxiang Zhang ◽  
Jun Liu ◽  
Ting Zhao ◽  
Weichao Yao ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Stimulated Raman Scattering ◽  
Maximum Output Power ◽  
Laser Cavity ◽  
Single Mode ◽  
Transverse Mode ◽  
Spectral Width ◽  
Maximum Output ◽  
Silica Fibers

We report a high-power cladding-pumped Er,Yb codoped all-fiber laser with truly single transverse mode output. The fiber laser is designed to operate at 1545 nm by the use of a pair of fiber Bragg gratings (FBGs) to lock and narrow the output spectrum, which can be very useful in generating the eye-safe ~1650 nm laser emission through the Stimulated Raman Scattering (SRS) in silica fibers that is of interest in many applications. Two pieces of standard single-mode fibers are inserted into the laser cavity and output port to guarantee the truly single-mode output as well as good compatibility with other standard fiber components. We have obtained a maximum output power of 19.2 W at 1544.68 nm with a FWHM spectral width of 0.08 nm, corresponding to an average overall slope efficiency of 31.9% with respect to the launched pump power. This is, to the best of our knowledge, the highest output power reported from simple all-fiber single-mode Er,Yb codoped laser oscillator architecture.

Capture of the stokes wave under coherent stimulated raman scattering

1984 ◽  
Vol 51 (3) ◽  
pp. 201-206 ◽  
Author(s):  
L.A. Bol'shov ◽  
V.V. Likhanskiǐ ◽  
M.I. Persiantsev ◽  
N.N. Yolkin
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Stokes Wave ◽  
Stimulated Raman

scholarly journals Novel constant-cladding tapered-core ytterbium-doped fiber for high-power fiber laser oscillator

2021 ◽  
Vol 9 ◽  
Author(s):  
Yun Ye ◽  
Xianfeng Lin ◽  
Xiaoming Xi ◽  
Chen Shi ◽  
Baolai Yang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
High Power ◽  
Stimulated Raman Scattering ◽  
Beam Quality ◽  
Maximum Output Power ◽  
Maximum Output ◽  
Power Scaling ◽  
Laser Oscillator ◽  
Optical Efficiency

Abstract Power scaling based on traditional ytterbium-doped fibers (YDFs) is limited by optical nonlinear effects and transverse mode instability (TMI) in high-power fiber lasers. Here, we propose a novel long tapered fiber with a constant cladding and tapered core (CCTC) along its axis direction. The tapered-core region of the fiber is designed to enhance the stimulated Raman scattering (SRS) threshold and suppress higher-order mode resonance in the laser cavity. The CCTC YDF was fabricated successfully with a modified chemical vapor deposition (MCVD) method combined with solution doping technology, which has a cladding diameter of 400 μm and a varying core with a diameter of ~24 μm at both ends and ~31 μm in the middle. To test the performance of the CCTC fiber during high-power operation, an all-fiber laser oscillator based on a CCTC YDF was investigated experimentally. As a result, a maximum output power of 3.42 kW was achieved with an optical-to-optical efficiency of 55.2%, although the TMI effect was observed at an output power of ~3.12 kW. The measured beam quality (M2 factor) was ~1.7, and no sign of the Raman component was observed in the spectrum. We believe that CCTC YDF has great potential to simultaneously mitigate the SRS and TMI effects, and further power scaling is promising by optimizing the structure of the YDF.

Evolution of the nth Stokes-wave due to stimulated Raman scattering in single-mode fibers

2014 ◽  
Vol 21 (5) ◽  
pp. 500-504 ◽  
Author(s):  
Rafael Sanchez-Lara ◽  
Lelio de la Cruz-May ◽  
Grethell Georgina Perez-Sanchez ◽  
Ricardo Cuenca-Alvarez ◽  
Jose Alfredo Alvarez-Chavez
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Single Mode ◽  
Stokes Wave ◽  
Stimulated Raman

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.

scholarly journals Mid-Infrared Multispectral Gaseous Stimulated Raman Scattering Laser

2021 ◽  
Vol 11 (24) ◽  
pp. 11875
Author(s):  
Chencheng Shen ◽  
Xianglong Cai ◽  
Tiancheng Zheng ◽  
Yuxi Jia ◽  
Dong Liu ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Laser Pulses ◽  
Rotational Transition ◽  
Laser Generation ◽  
Maximum Output ◽  
Mid Infrared ◽  
Ir Laser ◽  
Raman Lasers ◽  
Stimulated Raman

We demonstrated mid-infrared gaseous stimulated Raman scattering lasers in free space. Mixed gases of hydrogen and deuterium were used as Raman gain media in one Raman cell. Pumped by laser pulses at 1064 nm, the first Stokes Raman components at 1560 nm and 1907 nm were generated. A four-wave mixing process with the pump laser at 1064 nm and Raman lasers at 1560 nm and 1907 nm contributed to dramatically reducing the threshold of mid-IR laser generation at 4432 nm. The maximum output peak power of a mid-IR laser at 4432 nm reached 121 kW. Furthermore, by scattering on the rotational transition of deuterium, multispectral mid-IR Raman lasers at wavelengths of 2071 nm, 2266 nm, 2604 nm, 2920 nm, 3322 nm, 3743 nm, 4432 nm, and 5431 nm were also generated. Our results show that this is a convenient method to reduce the threshold and achieve a high power output with mid-IR Raman lasers.

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