High power spectrally beam combined fiber laser with near-diffraction limited beam quality

2007 ◽  
Author(s):  
Thomas H. Loftus ◽  
Paul R. Hoffman ◽  
Alison M. Thomas ◽  
Marc Norsen ◽  
Robert Royse ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Beam Quality

High power Q-switched fiber laser system emitting 26 mJ pulses with near diffraction-limited beam quality

2012 ◽  
Author(s):  
Fabian Stutzki ◽  
Florian Jansen ◽  
Andreas Liem ◽  
Cesar Jauregui ◽  
Jens Limpert ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Beam Quality ◽  
Laser System

1030 nm high power polarization maintained fiber laser with narrow linewidth and near-diffraction-limited beam quality

2018 ◽  
Author(s):  
Qiuhui Chu ◽  
Pengfei Zhao ◽  
Honghuan Lin ◽  
Bopeng Wang ◽  
Chao Guo ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Beam Quality ◽  
Narrow Linewidth

High-beam-quality signal and pump combiner with large-mode-area fiber for high-power fiber laser and amplifier

2019 ◽  
Vol 58 (6) ◽  
pp. 1336 ◽  
Author(s):  
Yanran Gu ◽  
Chengmin Lei ◽  
Huan Yang ◽  
Hu Xiao ◽  
Jinyong Leng ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Beam Quality ◽  
Large Mode Area ◽  
High Beam ◽  
Quality Signal ◽  
Mode Area ◽  
High Beam Quality

scholarly journals A high-power narrow-linewidth 1018 nm fiber laser based on a single-mode–few-mode–single-mode structure

2015 ◽  
Vol 3 ◽  
Author(s):  
Man Jiang ◽  
Pu Zhou ◽  
Hu Xiao ◽  
Pengfei Ma
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Beam Quality ◽  
Power Level ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Narrow Linewidth ◽  
Output Beam ◽  
Optical Efficiency ◽  
Spectral Ranges

We demonstrate an all-fiber high-power Yb-doped 1018 nm fiber laser with a Gaussian-shaped output beam profile based on a mismatched structure, which consists of a pair of single-mode fiber Bragg gratings and a section of few-mode double-cladding gain fiber. The output power is up to 107.5 W with an optical-to-optical efficiency of 63%, and the 3 dB band is 0.26 nm at this power level. Such a structure of single-mode–few-mode–single-mode fiber oscillator can be used to generate high-power narrow-linewidth lasing with excellent beam quality in other spectral ranges.

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.

scholarly journals Fabrication of 2 kW-Level Chirped and Tilted Fiber Bragg Gratings and Mitigating Stimulated Raman Scattering in Long-Distance Delivery of High-Power Fiber Laser

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 369
Author(s):  
Xiaofan Zhao ◽  
Xin Tian ◽  
Meng Wang ◽  
Binyu Rao ◽  
Hongye Li ◽  
...  
Keyword(s):  
Laser Beam ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Stimulated Raman Scattering ◽  
Beam Quality ◽  
Fiber Bragg Gratings ◽  
Long Distance ◽  
Laser Beam Quality ◽  
Distance Delivery

Chirped and tilted fiber Bragg gratings (CTFBGs) have attracted a lot of attention in stimulated Raman scattering (SRS) suppression of high-power fiber lasers. However, the laser power handling capacity seriously limits their applications. In this paper, by optimizing the inscription parameters and post-processing strategy, we fabricate a large-mode-area double-cladding CTFBG with a thermal slope of ~0.015 °C/W due to the low insertion loss of about 0.15 dB, which make it possible for direct kilowatt-level application. A 2 kW-level fiber laser oscillator is employed to test the CTFBG, and a series of experiments have been carried out to compare the effect of SRS mitigation in high-power fiber laser long-distance delivery. In addition, the influence of CTFBGs on laser beam quality is studied for the first time. Experimental results indicated that the CTFBG could effectively mitigate SRS and has no obvious influence on laser beam quality. This work opens a new opportunity for further power scaling and the delivery of high-power fiber lasers over longer distances.

scholarly journals Towards Ultimate High-power Scaling: Coherent Beam Combing of Fiber Lasers

2021 ◽  
Author(s):  
Hossein Fathi ◽  
Mikko Närhi ◽  
Regina Gumenyuk
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Beam Quality ◽  
Coherent Beam ◽  
Laser Source ◽  
Coherent Beam Combining ◽  
Beam Combining ◽  
Wide Range

Fiber laser technology has been demonstrated as a versatile and reliable approach for laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges are discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

High power Q-switched Fiber Laser System delivering 22mJ Pulse Energy with Excellent Beam Quality

2012 ◽  
Author(s):  
Florian Jansen ◽  
Fabian Stutzki ◽  
Andreas Liem ◽  
Cesar Jauregui ◽  
Jens Limpert ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Pulse Energy ◽  
Beam Quality ◽  
Laser System

scholarly journals 2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 532
Author(s):  
Xin Tian ◽  
Chenhui Gao ◽  
Chongwei Wang ◽  
Xiaofan Zhao ◽  
Meng Wang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Fiber Bragg Grating ◽  
High Power ◽  
Slope Efficiency ◽  
Laser Power ◽  
Beam Quality ◽  
Bragg Grating ◽  
High Signal ◽  
Output Coupling ◽  
Narrow Linewidth

We report a high power, narrow linewidth fiber laser based on oscillator one-stage power amplification configuration. A fiber oscillator with a center wavelength of 1080 nm is used as the seed, which is based on a high reflection fiber Bragg grating (FBG) and an output coupling FBG of narrow reflection bandwidth. The amplifier stage adopted counter pumping. By optimizing the seed and amplifier properties, an output laser power of 2276 W was obtained with a slope efficiency of 80.3%, a 3 dB linewidth of 0.54 nm and a signal to Raman ratio of 32 dB, however, the transverse mode instability (TMI) began to occur. For further increasing the laser power, a high-power chirped and tilted FBG (CTFBG) was inserted between the backward combiner and the output passive fiber, experimental results showed that both the threshold of Stimulated Raman scattering (SRS) and TMI increased. The maximum laser power was improved to 2576 W with a signal to Raman ratio of 42 dB, a slope efficiency of 77.1%, and a 3 dB linewidth of 0.87 nm. No TMI was observed and the beam quality factor M2 maintained about 1.6. This work could provide a useful reference for obtaining narrow-linewidth high-power fiber lasers with high signal to Raman ratio.

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