High power Q-switched Yb-doped photonic crystal fiber laser producing sub-10 ns pulses

Limpert, Jens; Deguil-Robin, N.; Petit, S.; Manek-Hönninger, Inka; Salin, F.; Rigail, P.; Hönninger, Clemens; Mottay, Eric

doi:10.1007/s00340-005-1820-7

Cited by 33 publications

(13 citation statements)

References 8 publications

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“…Output beams with a beam quality close to the diffraction limit (M 2 = 1.1) having pulse energies around 1.2 mJ at durations below 40 ns were reached. Investigations by Limpert et al [90] report on a Q-switched fiber laser producing 7 ns pulses corresponding to the status quo regarding pulse duration. Pulse energies of 0.5 mJ at a repetition rate of 500 Hz have been observed.…”

Section: Generation Of the Ignition Pulse By Active Fibersmentioning

confidence: 98%

Laser‐initiated ignition

Tauer¹,

Kofler

Wintner

2010

Laser & Photonics Reviews

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After an introduction illustrating the relevance and motivation of laser ignition of engines, the physical background is reviewed in a first technical section. This mainly comprises the mechanisms of plasma formation, which are the generation of first free electrons and their avalanche-like multiplication, being illustrated by emission and Schlieren diagnostics. Thereafter, combustion fundamentals are discussed leading to an understanding of flammability and minimum ignition laser energies. An important section is represented by the description of the components of laser ignition. This covers the setup and function of a diode-pumped passively Q-switched solid-state laser system, which preferentially is based on Nd:YAG. Other laser sources are mentioned for comparison. Furthermore, multiplexing schemes are discussed that are motivated by cost-saving issues. It is explained why present-day optical fibers are not capable of transporting nanosecond ignition pulses. As a last section, the concepts for an incoupling window and focusing optics are elucidated. Finally, after a summary, in an outlook the chances for commercial realization are analyzed.Sectional view of a prototype of a laser spark plug with an expanding flame kernel.

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Section: Generation Of the Ignition Pulse By Active Fibersmentioning

confidence: 98%

Laser‐initiated ignition

Tauer¹,

Kofler

Wintner

2010

Laser & Photonics Reviews

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“…Usually, conventional fiber lasers suffer from the quite long cavity length, typically several meters or even longer and, thus, the emission of quite long pulses in the range of >100 ns [2]. This can be overcome by using micro-structured photonic crystal large-mode-area rod-type fibers [3] with a short absorption length (~0.5 m) and an excellent energy storage capability. In this contribution, we report on the efficient generation of sub-10 ns pulses with 2.5 mJ pulse energy and up to 100 W average power from a Q-switched rod-type fiber laser with a diameter as large as 60 µm (corner-to-corner) allowing single-mode propagation.…”

Section: Introductionmentioning

confidence: 99%

High power Q-switched short-length fiber laser

Schmidt

Röser

Rothhardt

et al. 2006

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference

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“…In recent years, with the emergence of ultra-large core Yb-doped rod-type photonic crystal fiber (PCF), high power Ybdoped fiber laser has been greatly developed [8][9][10][11][12][13][14][15]. In 2008, two g roups develop 100 W class lasers of diffraction limited beam quality at 977 n m in the cw regime using this type of fiber at the same t ime [8,9], h ighlighting that the extraordinary output characteristics lies in the unique opto -geometrical parameters of the rod-type PCF.…”

Section: Introductionmentioning

confidence: 99%

Short-length large-mode-area photonic crystal fiber laser operating at 978 nm

Wang

et al. 2013

SPIE Proceedings

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The laser performance of a short-length Yb -doped rod-type photonic crystal fiber (PCF) laser is studied experimentally both in the three-level scheme and quasi-four-level scheme in this contribution. In the free oscillation mode, the rod-type PCF laser produce 13.6 W output power on the quasi-four-level system with center wavelength of 1030 n m. The laser operating on the three-level system is obtained with the introduction of specialized feedback around the 976 n m rad iation. Up to 7 W output power is generated with wavelength centered in 978 n m.

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High power Q-switched Yb-doped photonic crystal fiber laser producing sub-10 ns pulses

Cited by 33 publications

References 8 publications

Laser‐initiated ignition

Laser‐initiated ignition

High power Q-switched short-length fiber laser

Short-length large-mode-area photonic crystal fiber laser operating at 978 nm

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