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Publication . Article . Preprint . 2020

Pulsed-pump phosphorus-doped fiber Raman amplifier around 1260 nm for applications in quantum non-linear optics

Eilon Poem; Artem Golenchenko; Omri Davidson; Or Arenfrid; Ran Finkelstein; Ofer Firstenberg;
Open Access
English
Abstract

We describe a fiber Raman amplifier for nanosecond and sub-nanosecond pulses centered around 1260 nm. The amplification takes place inside a 4.5-m-long polarization-maintaining phosphorus-doped fiber, pumped at 1080 nm by 3-ns-long pulses with a repetition rate of 200 kHz and up to 1.75 kW peak power. The input seed pulses are of sub-mW peak-power and minimal duration of 0.25 ns, carved off a continuous-wave laser with sub-MHz linewidth. We obtain linearly-polarized output pulses with peak-powers of up to 1.4 kW, corresponding to peak-power conversion efficiency of over 80%. An ultrahigh small-signal-gain of 90 dB is achieved, and the signal-to-noise ratio 3 dB below the saturation power is above 20 dB. No significant temporal and spectral broadening is observed for output pulses up to 400 W peak power, and broadening at higher powers can be reduced by phase modulation of the seed pulse. Thus nearly-transform-limited pulses with peak power up to 1 kW are obtained. Finally, we demonstrate the generation of pulses with controllable frequency chirp, pulses with variable width, and double pulses. This amplifier is thus suitable for coherent control of narrow atomic resonances and especially for the fast and coherent excitation of rubidium atoms to Rydberg states. These abilities open the way towards several important applications in quantum non-linear optics.

14 pages, 7 figures. Your comments are welcome!

Subjects by Vocabulary

Microsoft Academic Graph classification: Optics business.industry business Nonlinear optics Laser linewidth Laser law.invention law Doppler broadening Chirp Coherent control Amplifier Energy conversion efficiency Materials science

Subjects

Physics - Optics, Quantum Physics, Optics (physics.optics), Quantum Physics (quant-ph), FOS: Physical sciences, Atomic and Molecular Physics, and Optics

Related Organizations
33 references, page 1 of 4

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Funded by
EC| Q-PHOTONICS
Project
Q-PHOTONICS
Quantum fluids of photons in optically-induced structures
  • Funder: European Commission (EC)
  • Project Code: 678674
  • Funding stream: H2020 | ERC | ERC-STG
Validated by funder
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