Modeling and optimizing of low-repetition-rate high-energy pulse amplification in high-concentration erbium-doped fiber amplifiers

Li, Jianfeng; Zhou, Dai; Ou, Zhonghua; Zhang, Lixun; Liu, Yongzhi; Liu, Yong

doi:10.1016/j.optcom.2009.06.005

Cited by 6 publications

(7 citation statements)

References 19 publications

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“…When we take into account the uncertainties resulting from possible differences between quenched and unquenched erbium cross-sections [39,43] and in other experimental parameters, as well as the spectral broadening, Fig. 4 suggests that for sufficiently short pulses, it is possible to recover the energy gain of unquenched fibers, as described by the FNE, also in our quenched fiber.…”

Section: Resultsmentioning

confidence: 93%

“…5, the agreement with the FNE is fair, but in contrast to the 6-ns pulse, the energy is now higher than that predicted by the FNE. Possible contributions to this difference include energy measurement errors, errors in the estimate for the initial gain used in the FNE, the increased ability of a higher-energy seed pulse to extract energy also in the edges of the core where the signal intensity is relatively low as well as from any Er 3+ -ions with atypically small cross-sections, and the increased ability of a higher-power pump to excite paired Er 3+ -ions, which may have smaller cross-sections [39,43] and thus store more energy for a given contribution to the gain. We also note that measurements with the same seed energy and PRF on a low-quenched EDF (unsaturable absorption 4.5% at 1536 nm) agreed well with the FNE.…”

Section: Pulse Amplification Results and Discussionmentioning

confidence: 99%

“…Thus, in this regime, a finite quenching time may allow for high-energy pulse amplification at higher quenching-levels than normally considered. Indeed, refined simulations with 2-μs quenching time showed a modest pulse-energy penalty of ~10% in an EDFA core-pumped with 10-200 mW at 980 nm [43], but there was no experimental investigation. The fractional unsaturable absorption was not stated, but we evaluate it to 1.7%.…”

Section: Introductionmentioning

confidence: 99%

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Efficient extraction of high pulse energy from partly quenched highly Er³⁺-doped fiber amplifiers

et al. 2020

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We demonstrate efficient pulse-energy extraction from a partly quenched erbiumdoped aluminosilicate fiber amplifier. This has a high erbium concentration that allows for short devices with reduced nonlinear distortions but also results in partial quenching and thus significant unsaturable absorption, even though the fiber is still able to amplify. Although the quenching degrades the average-power efficiency, the pulse energy remains high, and our results point to an increasingly promising outcome for short pulses. Furthermore, unlike unquenched fibers, the conversion efficiency improves at low repetition rates, which we attribute to smaller relative energy loss to quenched ions at higher pulse energy. A short (2.6 m) cladding-pumped partly quenched Er-doped fiber with 95-dB/m 1530-nm peak absorption and saturation energy estimated to 85 µJ reached 0.8 mJ of output energy when seeded by 0.2-µs, 23-µJ pulses. Thus, according to our results, pulses can be amplified to high energy in short highly Er-doped fibers designed to reduce nonlinear distortions at the expense of average-power efficiency.

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Section: Resultsmentioning

confidence: 93%

Section: Pulse Amplification Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient extraction of high pulse energy from partly quenched highly Er³⁺-doped fiber amplifiers

et al. 2020

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“…The transfer of energy between Ho 3+ ions involves two distinct upconversion processes. These processes are classified as homogeneous upconversion and inhomogeneous upconversion, the latter also referred to as PIQ as discussed by Li et al [16]. In homogeneous upconversion, the ions are evenly distributed and transfer of energy takes place between individual ions that are distant apart [16].…”

Section: Theorymentioning

confidence: 99%

Pair induced quenching in high concentration Holmium-doped fiber amplifiers

Mirza,

Ghafoor,

Almogren

et al. 2024

Phys. Scr.

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Holmium doped fiber amplifiers (HDFAs) have become a focus of researchers since they provide amplification in the very important spectral region around 2 μm wavelength. A major factor resulting in the performance degradation of HDFAs is the inhomogeneous energy transfer within Ho3+ ion-pairs in high-concentration Holmium doped fibers (HDFs), an effect generally known as pair-induced quenching (PIQ). In this paper, we study the luminal and temporal dynamics of pulses of different repetition rates at 2.05 μm in high-concentration HDFs considering the effects of ion-pairs. Input pulses having repetition rates of 25 GHz and 500 kHz are generated using wavelength tunable actively mode-locked Holmium-doped fiber laser (AML-HDFL) based on a single ring cavity and bidirectional pumping. The characteristics of the pulses propagating through high concentration HDF are analyzed based on different metrics such as average power, peak power, pulse energy, full width at half maximum, and time delay without and with ion-pairs for values of fraction of ion-pairs k = 0 and k = 10%, respectively. The results obtained at optimized length of HDF show that ion-pairs significantly degrade the average power, peak power, and energy of the output pulses for both of the repetition rates. For both k = 0 and k = 10%, the FWHM and shape of the output pulses remain same in the presence of the ion-pairs while, time delay of 4 ps and 19 ns is observed in the output pulses at repetition rates of 25 GHz and 500 kHz, respectively. The effects of increasing the pump and signal power on the average power and energy of the output pulses for k = 0 and k = 10% are also discussed for both repetition rates. This analysis provides important guidelines for designers of 2 μm fiber lasers and amplifiers based on high-concentration HDFs.

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“…A few theoretical models and optimizations concerning the pulse amplification of single double-clad erbium and ytterbiumdoped fiber amplifiers have been reported [11][12][13][14][15][16]. Recently, we also model and optimize the low-repetition-rate pulse amplification in single high-concentration EDFA with the ionpairs being taken into account [17]. For the optimization of a multi-stage fiber MOPA system, the used method in [18] is to optimize every stage individually to obtain the combination of high-gain and broad-bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and optimized design of low-repetition-rate high-energy pulse amplification in multi-stage MOPA systems

Li¹,

Chen²,

Chen³

et al. 2010

J. Opt.

Self Cite

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Based on the modeling of a fiber amplification system, a closed form rate and power evolution equation for low-repetition-rate pulse amplification in a multi-stage fiber master-oscillator-power-amplifier (MOPA) is constructed. In order to ensure a high-energy conversing efficiency at the lowest cost, a novel multi-stage optimization method is proposed for the optimization of the multi-stage MOPA system. Differently from the individual optimization method for single fiber amplifiers, every stage amplifier is considered as a part of the whole system and optimized by analyzing the final output pulse energy. As an example, the system parameters of a two stage ytterbium-doped fiber MOPA system including the fiber length, pump power, and peak power of the seed source are optimized by using the proposed method. Under the condition of obtaining almost the same output pulse energy, the fiber length and pump power of the first stage optimized by the new method are, respectively, shorter and lower, 1.6 m and 57.3 W, than those optimized by the individual optimization method. Meanwhile, the optimization results also show that increasing the input signal energy is not an effective way to increase the output energy. The proposed theoretical optimization method can provide an important guide for the design and optimization of the low-repetition-rate pulse amplification in a multi-stage MOPA system.

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Modeling and optimizing of low-repetition-rate high-energy pulse amplification in high-concentration erbium-doped fiber amplifiers

Cited by 6 publications

References 19 publications

Efficient extraction of high pulse energy from partly quenched highly Er³⁺-doped fiber amplifiers

Efficient extraction of high pulse energy from partly quenched highly Er³⁺-doped fiber amplifiers

Pair induced quenching in high concentration Holmium-doped fiber amplifiers

Theoretical and optimized design of low-repetition-rate high-energy pulse amplification in multi-stage MOPA systems

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Modeling and optimizing of low-repetition-rate high-energy pulse amplification in high-concentration erbium-doped fiber amplifiers

Cited by 6 publications

References 19 publications

Efficient extraction of high pulse energy from partly quenched highly Er3+-doped fiber amplifiers

Efficient extraction of high pulse energy from partly quenched highly Er3+-doped fiber amplifiers

Pair induced quenching in high concentration Holmium-doped fiber amplifiers

Theoretical and optimized design of low-repetition-rate high-energy pulse amplification in multi-stage MOPA systems

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Efficient extraction of high pulse energy from partly quenched highly Er³⁺-doped fiber amplifiers

Efficient extraction of high pulse energy from partly quenched highly Er³⁺-doped fiber amplifiers