High-power and near-shot-noise-limited intensity noise all-fiber single-frequency 15 μm MOPA laser

Yang, Changsheng; Guan, Xianchao; Zhao, Qilai; Wu, Bo; Feng, Zhouming; Gan, Jiulin; Cheng, Huihui; Peng, Mingying; Yang, Zhongmin

doi:10.1364/oe.25.013324

Cited by 20 publications

(13 citation statements)

References 27 publications

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“…Similar to frequency noise, the suppression of intensity noise could be performed passively to avoid the demanding requirements on servo bandwidths. The use of a saturated optical amplifier can generate SNL light with watts of optical power over at least a 50 MHz bandwidth [47]. Alternatively, collinear balanced detection can be used as a notch filter on laser intensity noise, with center frequencies of the notch filter being able to be passively selected from MHz to GHz [48].…”

Section: Discussionmentioning

confidence: 99%

Limits on atomic qubit control from laser noise

Day¹,

Low²,

White³

et al. 2021

Preprint

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Technical noise present in laser systems can limit their ability to perform high fidelity quantum control of atomic qubits. The ultimate fidelity floor for atomic qubits driven with laser radiation is due to spontaneous emission from excited energy levels. The goal is to suppress the technical noise from the laser source to below the spontaneous emission floor such that it is no longer a limiting factor. It has been shown that the spectral structure of control noise can have a large influence on achievable control fidelities, while prior studies of laser noise contributions have been restricted to noise magnitudes. Here, we study the unique spectral structure of laser noise and introduce a new metric that determines when a stabilised laser source has been optimised for quantum control of atomic qubits. We find requirements on stabilisation bandwidths that can be orders of magnitude higher than those required to simply narrow the linewidth of a laser. We introduce a new metric, the χ-separation line, that provides a tool for the study and engineering of laser sources for quantum control of atomic qubits below the spontaneous emission floor.

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Section: Discussionmentioning

confidence: 99%

Limits on atomic qubit control from laser noise

Day¹,

Low²,

White³

et al. 2021

Preprint

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“…Consequently, the erbium doping concentration in the EY-DCF may be much higher than that in common EDFs. This makes it possible to use a shorter EY-DCF in 1.5-µm high-power fiber amplification, which is very beneficial for suppressing the stimulated Brillouin scattering (SBS) effect in laser signals with very narrow linewidth [10].…”

Section: Introductionmentioning

confidence: 99%

Cladding-Pumped Erbium-Ytterbium Co-Doped Fiber Amplifier With Dual-Wavelength Auxiliary Signal Injection of 1030 and 1040 nm

et al. 2020

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We propose and demonstrate a cladding-pumped, erbium-ytterbium co-doped fiber amplifier (EYDFA) scheme based on dual wavelength auxiliary signal injection technique to solve the issue of the backward Yb-ASE self-lasing under strong pumping for the high-power fiber amplification of 1.5-µm kHz-linewidth linearly-polarized laser signal. With the dual wavelength auxiliary signal of 1030 and 1040 nm injection, the allowable maximum pump power without triggering the backward Yb-ASE self-lasing can be greatly increased due to the relieving effect on the inhomogeneous gain broadening. For an EYDFA with 3.8-m erbium-ytterbium co-doped double-clad fiber, the net output power is improved to 13.8 W, while the linewidth of the amplified single-transverse-mode linearly-polarized 1560 nm laser signal is still only 3.5 kHz. The SBS effect is observed to be trivial during the fiber amplification.

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“…Unfortunately, for the 1.6 μm SFFLs all-fiber master-oscillator power-amplifier (MOPA) configuration, the output powers were usually limited within 20 W and slope efficiencies were around 20% in several experiments because of the low emission cross-section of Er 3+ ion near 1.6 μm [6,[14][15][16]. Besides, the power scaling of 1.6-μm lasers is facile to be saturated, and the signal characteristics severely degrade due to a large amount of the amplified spontaneous emission (ASE) [13,17]. Usually, more pump power and longer active fiber can offer more gain for signal light in MOPA system.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping

et al. 2020

Self Cite

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In this paper, a technique combing cascaded energy-transfer pumping (CEP) method and master-oscillator power-amplifier (MOPA) configuration is proposed for power scaling of 1.6-μm-band single-frequency fiber lasers (SFFLs), where the Er 3+ ion has a limited gain. The CEP technique is fulfilled by coupling a primary signal light at 1.6 μm and a C-band auxiliary laser. The numerical model of the fiber amplifier with the CEP technique reveals that the energy transfer process involves the pump competition and the in-band particle transition between the signal and auxiliary lights. Moreover, for the signal emission, the population density in the upper level is enhanced and the effective population inversion is achieved due to the CEP. A single-frequency MOPA laser at 1603 nm with an output power of 52.6 W and an improved slope efficiency of 30.4% is obtained experimentally through the CEP technique. Besides, a laser linewidth of 5.2 kHz and a polarization-extinction ratio of ~18 dB are obtained at the maximum output power. The proposed technique provides an optional method of increasing the slope efficiency and power scaling for fiber lasers operating at L-band.

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High-power and near-shot-noise-limited intensity noise all-fiber single-frequency 15 μm MOPA laser

Cited by 20 publications

References 27 publications

Limits on atomic qubit control from laser noise

Limits on atomic qubit control from laser noise

Cladding-Pumped Erbium-Ytterbium Co-Doped Fiber Amplifier With Dual-Wavelength Auxiliary Signal Injection of 1030 and 1040 nm

High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping

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