Effective suppression of stimulated Raman scattering in high power fiber amplifiers using double-pass scheme

Lai, Pik Yin; Chang, Chun Lin; Huang, Sheng‐Lung; Chen, Shih Hung

doi:10.1117/12.2039358

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…This is in general a nontrivial task, as will be discussed in the next section. For a single-pass amplifier, the FM and HOM output amplitudes are uniquely determined by the input amplitudes, through the propagation equations (10) and (11), when stripped of their contributions from backward-propagating modes. Similarly, if all a m± (0) amplitudes were specified for the double-pass amplifier, the a m± (0) would be uniquely determined by propagating Eqs.…”

Section: Formal Theorymentioning

confidence: 99%

“…In this case, the a 2± terms may be dropped from Eqs. (10) and (12), which may then be solved for a rotationally invariant power distribution. In the present work, the transverse field distributions are taken to be with R 1 , R 2 being the radial mode profiles of LP 01 and LP 11 modes respectively.…”

Section: Formal Theorymentioning

confidence: 99%

“…a photonic crystal rod fiber, or the like) may in effect be utilized for two amplification stages. The usefulness of double-pass amplification schemes for short-pulsed fiber laser systems has been demonstrated by several authors [8][9][10]. So far, however, no results have been published in the power regime where TMI becomes problematic for single-pass amplifiers (typically 2-300 W, with some dependence on system and fiber design).…”

Section: Introductionmentioning

confidence: 99%

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Static thermo-optic instability in double-pass fiber amplifiers

Lægsgaard¹

2016

Opt. Express

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A coupled-mode formalism, earlier used to describe transverse mode instabilities in single-pass optical fiber amplifiers is extended to the case of double-pass amplifiers. Contrary to the single-pass case, it is shown that the thermo-optic nonlinearity can couple light at the same frequency between the LP₀₁ and LP₁₁ modes, leading to a static deformation of the output beam profile. This novel phenomenon is caused by the interaction of light propagating in either direction with thermo-optic index perturbations caused by light propagating in the opposite direction. The threshold power for the static deformation is found to be several times lower than what is typically found for the dynamic modal instabilities observed in single-pass amplifiers.

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Section: Formal Theorymentioning

confidence: 99%

Section: Formal Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Static thermo-optic instability in double-pass fiber amplifiers

Lægsgaard¹

2016

Opt. Express

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“…In the communication field, researchers have focused on improving the performance of DP fiber amplifiers for several years [2], [3]. Some complex mechanisms such as nonlinear effects [4] and pulse overlap [5] have been studied in detail. These reports are helpful in improving the gain efficiency of some DP pulse amplifiers but unfortunately there have been only a few studies regarding the Yb-doped fiber amplifier which is a key element in the front end of laser injection Fig.…”

Section: Introductionmentioning

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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Compact millijoule diode-seeded two-stage fiber master oscillator power amplifier using a multipass and forward pumping scheme

et al. 2018

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The multipass scheme for a diode-seeded fiber master oscillator power amplifier with a nanojoule-to-millijoule output energy level at a repetition rate of <100 kHz is numerically analyzed for comparison to an experimental benchmark. For a 6/125 single-mode preamplifier with a small input energy (<1 nJ), there is a significant improvement in the output energy from 0.7% to 80% and 95% of the maximum extractable energy using the double-pass and four-pass schemes, respectively. For a 30/250 large-mode-area power amplifier using the double-pass and forward pumping scheme, the required input energy is decreased from 100 μJ to 18 μJ for millijoule energy extraction with accompanying Stokes waves of less than 10% of the total energy. The system based on the full master oscillator power amplifier configuration with an output energy exceeding millijoule level can be optimally simplified to two stages for commercialization.

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Effective suppression of stimulated Raman scattering in high power fiber amplifiers using double-pass scheme

Cited by 3 publications

References 16 publications

Static thermo-optic instability in double-pass fiber amplifiers

Static thermo-optic instability in double-pass fiber amplifiers

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

Compact millijoule diode-seeded two-stage fiber master oscillator power amplifier using a multipass and forward pumping scheme

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