Incoherent Beam Combining of Continuous-Wave and Pulsed Yb-Doped Fiber Amplifiers

Thomas, Sabu; Wirth, Christian; Schmidt, O.; Andersen, Thomas; Tsybin, I.; Böhme, Steffen; Peschel, Thomas; Brückner, Frank; Clausnitzer, Tina; Röser, F.; Eberhardt, Ramona; Limpert, Jens; Tünnermann, Andreas

doi:10.1109/jstqe.2008.2012267

Cited by 18 publications

(4 citation statements)

References 26 publications

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“…But the output power of a single fiber laser is limited by thermal load, fiber damage and nonlinearity such as stimulated Raman scattering processes, and mode instabilities [4][5][6] . To overcome these limitations, beam combing is a major approach for increasing the output power of fiber lasers [7][8][9] . Among all the beam combing methods, most approaches are based on free-space structure 10,11 .…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of vector modes in a conventional photonic lantern

Zhou

Wang

Xiao

et al. 2022

Sixth International Symposium on Laser Interaction With Matter

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Vector mode properties in a 3×1 conventional photonic lantern (CPL) are theoretically investigated. Analytical solutions of vector modes in fiber cores at the weak tapering region of a 3×1 CPL are derived based on coupled mode theory and linear combination method. While at the strong tapering region of a 3×1 CPL where core modes cut off, vector modes in cladding can be derived by ignoring the impact of original fiber cores. These analytical solutions are verified by numerical calculations by a fully vectorial finite element mode solver. Further investigation shows that although there is no linear polarization selection mechanism in the tapering region of a CPL, linear polarization (LP) modes are still suitable for CPLs only if fiber modes finally evolve into LP modes in the output fiber. This conclusion can be very useful for simplifying the mode analysis of CPLs.

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Section: Introductionmentioning

confidence: 99%

Theoretical investigation of vector modes in a conventional photonic lantern

Zhou

Wang

Xiao

et al. 2022

Sixth International Symposium on Laser Interaction With Matter

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“…However, for SBC by VBG, combining five channels has only possessed a 1 nm spectral band [7], and for interference filter combining, the combined spectral range covers around 1030 [9] or 1050 nm [10]. Even for diffraction grating SBC, experimental implementation of a spectral band has possessed less than 24 nm [11,[18][19][20], deficient in useful Yb-gain bandwidth covers more than 100 nm.…”

Section: Introductionmentioning

confidence: 99%

Spectral beam combining of fiber laser with wavelength separation broader than 60 nm

Jiang

Zhang

et al. 2016

Laser Phys.

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We report a two-channel spectral-beam-combined 1 µm fiber laser using a diffraction grating that produces 45 W average output power with a 62 nm broad band wavelength, and shows excellent prospects for additional power scaling. The combining efficiency is as high as 95%. To our knowledge, these results represent the broadest wavelength band to date for a beam-combined fiber laser system, which has reached 2.5 times the spectrum of the combined beams previously.

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“…The utilization of amplifier configurations can avoid the high intra-cavity power density which limits the power scaling of a singlestage Q-switched or gain-switched nanosecond fiber laser. In order to alleviate signal saturation of a single-stage amplifier [2], the pulse energy, peak power [3], or average power [4] have been scaled up using fiber amplifier cascades or the so-called configuration of master oscillator power amplifier (MOPA). It is composed of a highly controlled seed, high-gain preamplifiers, and high-efficiency power amplifiers.…”

Section: Introductionmentioning

confidence: 99%

Parasitic Stimulated Amplification in High-Peak-Power and Diode-Seeded Nanosecond Fiber Amplifiers

Chang

Lai

et al. 2014

IEEE Photonics J.

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The broadband parasitic amplification in a diode-seeded nanosecond ytterbium-doped fiber laser amplifier system is numerically and experimentally investigated. The amplification is originated from a weak and pulsed parasitic signal associated with the 1064-nm seed diode laser. Although the average power of the parasitic pulse is less than 5% of the total seed laser power, a significant transient spike is observed during the amplification. In agreement with the simulation, nonlinear effects caused by the transient spike limits the scaling of signal peak power in fiber preamplifiers. With the utilization of a narrow bandwidth filter to eliminate the parasitic pulse, the power and energy scalability of a multistage diode-seeded fiber amplifier laser system has been significantly improved. At 1064 nm, pulses with the peak power of 120 kW and energy of 1.2 mJ have been successfully generated in the multistage Yb 3þ -doped fiber amplifier with an energy gain of 63 dB and 56% conversion efficiency. In viewing of the parasitic pulse's 8.8-nm bandwidth, it has the potential to become a novel seed source for high-peak-power fiber amplifiers.

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Incoherent Beam Combining of Continuous-Wave and Pulsed Yb-Doped Fiber Amplifiers

Cited by 18 publications

References 26 publications

Theoretical investigation of vector modes in a conventional photonic lantern

Theoretical investigation of vector modes in a conventional photonic lantern

Spectral beam combining of fiber laser with wavelength separation broader than 60 nm

Parasitic Stimulated Amplification in High-Peak-Power and Diode-Seeded Nanosecond Fiber Amplifiers

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