Synchronised Pulsed Pumped Fiber Amplifiers

Bohling, Christian; Zimmermann, Horst; Hohmann, Konrad; Schippers, Wolfgang; Schade, Wolfgang

doi:10.1109/cleo.2007.4452584

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Experimental investigations in [91] showed the amplification of a 100-μJ at 1 ns seed pulse formed by a microchip laser leading to a 1.5-mJ output beam with a high beam quality. Variations in pulse duration were not noticed.…”

Section: Generation Of the Ignition Pulse By Active Fibersmentioning

confidence: 99%

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: 99%

Laser‐initiated ignition

Tauer¹,

Kofler

Wintner

2010

Laser & Photonics Reviews

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“…In the same year, Ye et al reported a fiber amplifier which could generate 167 kW peak power and 0.83 ns duration pulses at 200 Hz repetition rate under the optimum pump pulse duration of 475 s [11]. In 2007, Bohling et al got that the pulse energy was 1.4 mJ at a pulse duration 1.0 ns at repetition rate 200 Hz, and the pump pulse width was about 150 s [12]. In 2009, Kong et al achieved the 200 W peak power and 120 ps duration pulses at 100 Hz repetition rate, and the pump pulse width was 400 s [13].…”

Section: Introductionmentioning

confidence: 97%

“…As we can see, in Refs. [10][11][12][13][14] the pump pulse widths are very different. However, the gain property of fiber amplifier and the power of ASE are determined by the pump pulse width to a great extent.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study of the pump pulse width optimization of the Yb-doped fiber amplifier

Wei

Tan

et al. 2013

Optik

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“…Compared with Q switching and mode locking methods, a semiconductor seed source followed by a multi-stage fiber master oscillator power amplifier (MOPA) system would be an effective technology to obtain the high energy pulse [1−3] . In the low-repetition-rate high-energy MOPA system, it is very important to optimize the pump pulse width in order to achieve the best amplification results, meanwhile, suppress the amplified spontaneous emission (ASE) and reduce the heat generated in the amplification process [4,5] . So, it is necessary to analyse the time to reach the steady state for stored energy, and the built-up time of ASE.…”

mentioning

confidence: 99%

Theoretical and experimental study of transient response of the Yb-doped fiber amplifier

Wei¹,

Zhu³

2012

中国光学快报

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Some analysis of the transient response of the Yb-doped fiber amplifier are performed by solving a set of time-dependent rate and power transfer equations based on finite-difference method. Meanwhile, the variation of time to reach the steady state for upper level population distribution, the forward and backward amplified spontaneous emissions (ASEs) and stored energy on the system parameters including pump power, fiber length, Yb-doped concentration, and core area are numerically simulated, respectively. The results show that, by optimizing pump pulse width, stored energy can reach or even exceed the steady state value of continuous wave (CW) pump. By increasing Yb-doped concentration and core area, stored energy is increased, the ASE is suppressed and the ASE built-up time is postponed. In addition, the experimental results show the validity of the theoretical ASE built-up time. The obtained results can provide important guiding for the optimization of pump pulse width and fiber parameters.OCIS The high energy pulses with millijoule (mJ) level and nanosecond order duration are required for many practical applications such as atmospheric optical communication, laser range finding, remote sensing, lidar, and nonlinear frequency conversion. Compared with Q switching and mode locking methods, a semiconductor seed source followed by a multi-stage fiber master oscillator power amplifier (MOPA) system would be an effective technology to obtain the high energy pulse [1−3] . In the low-repetition-rate high-energy MOPA system, it is very important to optimize the pump pulse width in order to achieve the best amplification results, meanwhile, suppress the amplified spontaneous emission (ASE) and reduce the heat generated in the amplification process [4,5] . So, it is necessary to analyse the time to reach the steady state for stored energy, and the built-up time of ASE. A few theoretical models for Yb-doped fiber amplifiers have been proposed. Hardy et al. deduced a set of approximate analytical expressions to describe the steady state signals, ASE, and Rayleigh scattering, for modeling of high power double-clad fiber amplifiers [6−8] . Wang et al. analysed the dynamic characteristics of high power pulse amplification and Raman effect in detail [9,10] . Chang et al. comparatively studied the small signal pulse and high power pulse amplification [11] . Xu et al. introduced the influence of the pump power, fiber length, and core diameter to the ASE power [12] . However, in the previous researches, before inputting the signal, amplifiers are assumed to have achieved the steady state under continuous wave (CW) pump. Furthermore, the theoretical and experimental study of time to reach the steady state for stored energy and the ASE built-up time of the Yb-doped fiber amplifier have not been reported in the literature.The focus of this letter is the transient response of stored energy and ASE before injecting the seed light. By solving a set of time-dependent rate and power transfer equations based on finite-difference metho...

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Synchronised Pulsed Pumped Fiber Amplifiers

Cited by 4 publications

References 3 publications

Laser‐initiated ignition

Laser‐initiated ignition

Theoretical and experimental study of the pump pulse width optimization of the Yb-doped fiber amplifier

Theoretical and experimental study of transient response of the Yb-doped fiber amplifier

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