2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers

Wirth, Christian; Schmidt, O.; Tsybin, I.; Thomas, Sabu; Peschel, Thomas; Brückner, Frank; Clausnitzer, Tina; Limpert, Jens; Eberhardt, Ramona; Tünnermann, A.; Gowin, M.; Have, Eric ten; Ludewigt, K.; Jung, Markus

doi:10.1364/oe.17.001178

Cited by 90 publications

(30 citation statements)

References 17 publications

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“…In this respect 522 W of average output power with a combining efficiency of 93% was reported when using a surface grating [12]. With a reduced combining efficiency of 61% even 2 kW of power was shown [13]. Reaching these high output powers makes the combination of fiber lasers very attractive for certain applications.…”

Section: Introductionmentioning

confidence: 95%

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16 W output power by high-efficient spectral beam combining of DBR-tapered diode lasers

Müller¹,

Vijayakumar²,

Jensen³

et al. 2011

Opt. Express

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Up to 16 W output power has been obtained using spectral beam combining of two 1063 nm DBR-tapered diode lasers. Using a reflecting volume Bragg grating, a combining efficiency as high as 93.7% is achieved, resulting in a single beam with high spatial coherence. The result represents the highest output power achieved by spectral beam combining of two single element tapered diode lasers. Since spectral beam combining does not affect beam propagation parameters, M 2 -values of 1.8 (fast axis) and 3.3 (slow axis) match the M 2 -values of the laser with lowest spatial coherence. The principle of spectral beam combining used in our experiments can be expanded to combine more than two tapered diode lasers and hence it is expected that the output power may be increased even further in the future.

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Section: Introductionmentioning

confidence: 95%

“…In both cases mentioned above [12,13], lasers emitting around 1060 nm and spectrally spaced 2.5 nm to 5 nm were used. Using comparable diode lasers this could cause a serious reduction of performance due to heat effects when tuning their wavelengths by changing the laser temperatures.…”

Section: Introductionmentioning

confidence: 99%

16 W output power by high-efficient spectral beam combining of DBR-tapered diode lasers

Müller¹,

Vijayakumar²,

Jensen³

et al. 2011

Opt. Express

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“…최근에 는 비선형 현상과 더불어 모드 불안정 현상 또한 광섬유 레 이저의 출력을 제한하는 요소가 될 수 있다고 보고되고 있는 데 [11,[40][41][42][43][44][45][46][47][48] , 이는 광신호의 평균 출력에 따라 출력 빔 모드 특 성이 심각하게 왜곡되는 현상으로, 특히 광섬유의 코어가 크 고 그 유효 개구수(Numerical Apeture)가 낮으며 상대적으로 펌프광 흡수율이 높은 막대형 이득 광섬유(Rod-Type Gain Fiber)에서 더욱 현저히 발생한다 [41][42][43][44][45][46][47] . [49][50][51][52][53][54][55][56][57] . 최종적으로 제5장 에서는 앞으로의 고출력 광섬유 레이저 기술에 대한 전망 및 발전 방향을 제시하며 본 논문의 논의를 마무리하고자 한다.…”

Section: 서 론unclassified

Current Status and Prospects of High-Power Fiber Laser Technology (Invited Paper)

Kwon¹,

Park²,

Lee³

et al. 2016

Korean Journal of Optics and Photonics

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Over the past two decades, fiber-based lasers have made remarkable progress, now having reached power levels exceeding kilowatts and drawing a huge amount of attention from academy and industry as a replacement technology for bulk lasers. In this paper we review the significant factors that have led to the progress of fiber lasers, such as gain-fiber regimes based on ytterbium-doped silica, optical pumping schemes through the combination of laser diodes and double-clad fiber geometries, and tandem schemes for minimizing quantum defects. Furthermore, we discuss various power-limitation issues that are expected to incur with respect to the ultimate power scaling of fiber lasers, such as efficiency degradation, thermal hazard, and system-instability growth in fiber lasers, and various relevant methods to alleviate the aforementioned issues. This discussion includes fiber nonlinear effects, fiber damage, and modal-instability issues, which become more significant as the power level is scaled up. In addition, we also review beam-combining techniques, which are currently receiving a lot of attention as an alternative solution to the power-scaling limitation of high-power fiber lasers. In particular, we focus more on the discussion of the schematics of a spectral beam-combining system and their individual requirements. Finally, we discuss prospects for the future development of fiber laser technologies, for them to leap forward from where they are now, and to continue to advance in terms of their power scalability.

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“…For example, YDFLs at wavelength ranges of 1010-1020 nm with narrow bandwidths can not only be frequency quadrupled to 25× nm for laser-induced fluorescence, optical refrigeration, semiconductor inspection and atomic trapping applications [3][4][5][6][7] but can also be used for tandem-pumping high-power C-band (1.06-1.12 µm) YDFLs, due to their smaller quantum defect which gives higher conversion efficiency and lower thermal load [8,9] . Moreover, as an outstanding pathway for achieving scalable high-power lasers with good beam quality, spectral beam combining (SBC) combines multiple lasers into a single beam for maximum output power [10][11][12][13][14][15][16][17] . To date, the most common wavelength range for SBC is from 1050 to 1080 nm.…”

Section: Introductionmentioning

confidence: 99%

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

Jiang

Zhang

et al. 2015

High Pow Laser Sci Eng

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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.

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2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers

Cited by 90 publications

References 17 publications

16 W output power by high-efficient spectral beam combining of DBR-tapered diode lasers

16 W output power by high-efficient spectral beam combining of DBR-tapered diode lasers

Current Status and Prospects of High-Power Fiber Laser Technology (Invited Paper)

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

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