Analytical and numerical solutions to the amplifier with incoherent pulse temporal overlap

Li, M; Zhang, X M; Wang, Z G; Cui, Xudong; Xia, Yan; Jiang, Xiaolong; Zheng, Jiangang; Wang, W; Li, Mingzhong

doi:10.1016/j.optcom.2016.07.047

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…Thus, the Frantz-Nodvik equations can be used to permit a fast computation of the gain, instead of a numerical simulation using the complex rate equations. Although the traditional Frantz-Nodvik equations have been widely used in the gain calculation of solid-state amplifiers [5], [16], [17], they are inadequate to analyze the amplification process in a fiber amplifier because the strong reabsorption and the population depletion by ASE can significantly influence the gain. Therefore, the dimension of the wavelength is extended in our simulation to make it valid for a fiber amplifier.…”

Section: Theoretical Modelmentioning

confidence: 99%

Improvement of Noise and Gain Characteristics of Low-Repetition-Rate Double-Pass Fiber Amplifiers

Fan

Wang

et al. 2019

IEEE Photonics J.

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The noise and gain characteristics of pulsed double-pass (DP) amplifiers operating at low repetition rates are analyzed theoretically and experimentally. The Frantz-Nodvik equations are extended to realize rapid calculation of signal gain in DP fiber amplifiers. At the same time, the rate equations are used to compute the evolution of amplified spontaneous emission (ASE) noise. The effects of the pump scheme, the input energy, and the insertion loss on the gain and noise characteristics are discussed. Based on the simulation results, a new structure Yb-doped DP amplifier is proposed. The experimental results show that the small-signal gain of the DP amplifier can exceed 50 dB. In particular, the average ASE background of the DP amplifier at high-energy output is lower than that of the singlepass amplifier at the same output. This result is quite different from continuous-wave fiber amplifiers.

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Section: Theoretical Modelmentioning

confidence: 99%

Improvement of Noise and Gain Characteristics of Low-Repetition-Rate Double-Pass Fiber Amplifiers

Fan

Wang

et al. 2019

IEEE Photonics J.

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“…However, in a double-pass amplifier in which pulse overlap occurs, the leading edge of a pulse that has already passed the SA affects the amplification of the trailing edge of a pulse that enters the SA. 17,[23][24][25] Therefore, to calculate I , in T d should be known. To resolve this contradiction, an iterative algorithm is employed, as follows: first, calculate I in under the assumption of = A low flashing rate (1 Hz) is used, so that the thermal lens has the focal length (approximately 70 m) much longer than amplifier length (0.51 m) and the depolarization loss 26) become negligible without additional divergence control.…”

mentioning

confidence: 99%

Amplified spontaneous emission suppression of a saturable absorber in a nanosecond double-pass laser amplifier

Jeong

Cho

Hwang

et al. 2019

Jpn. J. Appl. Phys.

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We propose the insertion of a saturable absorber (SA) in a nanosecond double-pass laser amplifier as an amplified spontaneous emission (ASE) suppressor. To analyze the influence of the SA, a theoretical model is developed. One-dimensional simulation results show reasonable agreement with measurements in terms of the output energy and temporal pulse shape. For our amplifier parameters, when an SA of initial transmission 0.5 is inserted, the simulation anticipates the ASE to be reduced by a factor of 0.37 while the output pulse energy is maintained.

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Optimization of the pulse width and injection time in a double-pass laser amplifier

Park

Jeong

2018

High Pow Laser Sci Eng

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We have optimized the input pulse width and injection time to achieve the highest possible output pulse energy in a double-pass laser amplifier. For this purpose, we have extended the modified Frantz-Nodvik equation [1] by simultaneously including both spontaneous emission and pump energy variation. The maximum achieved fluence of the output pulse was 2.4 J/cm 2 . An input pulse energy of 1 J could be maximally amplified to output pulse energy of 12.17 J, where the optimal values of the pulse width and injection time of the input pulse were 168 and 10 , respectively, with the effective pump energy being 8.84 J.

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Analytical and numerical solutions to the amplifier with incoherent pulse temporal overlap

Cited by 6 publications

References 17 publications

Improvement of Noise and Gain Characteristics of Low-Repetition-Rate Double-Pass Fiber Amplifiers

Improvement of Noise and Gain Characteristics of Low-Repetition-Rate Double-Pass Fiber Amplifiers

Amplified spontaneous emission suppression of a saturable absorber in a nanosecond double-pass laser amplifier

Optimization of the pulse width and injection time in a double-pass laser amplifier

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