Low noise all-fiber amplification of a coherent supercontinuum at 2 µm and its limits imposed by polarization noise

Heidt, Alexander M.; Modupeh Hodasi, Joanna; Rampur, Anupamaa; Spangenberg, Dirk-Mathys; Ryser, Manuel; Klimczak, Mariusz; Feurer, Thomas (2020). Low noise all-fiber amplification of a coherent supercontinuum at 2 µm and its limits imposed by polarization noise. Scientific reports, 10(1) Springer Nature 10.1038/s41598-020-73753-2

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We report a low noise, broadband, ultrafast Thulium/Holmium co‐doped all‐fiber chirped pulse amplifier, seeded by an Erbium‐fiber system spectrally broadened via coherent supercontinuum generation in an all‐normal dispersion photonic crystal fiber. The amplifier supports a − 20 dB bandwidth of more than 300 nm and delivers high quality 66 fs pulses with more than 70 kW peak power directly from the output fiber. The total relative intensity noise (RIN) integrated from 10 Hz to 20 MHz is 0.07%, which to our knowledge is the lowest reported RIN for wideband ultrafast amplifiers operating at 2 μm to date. This is achieved by eliminating noise‐sensitive anomalous dispersion nonlinear dynamics from the spectral broadening stage. In addition, we identify the origin of the remaining excess RIN as polarization modulational instability (PMI), and propose a route towards complete elimination of this excess noise. Hence, our work paves the way for a next generation of ultra‐low noise frequency combs and ultrashort pulse sources in the 2 μm spectral region that rival or even outperform the excellent noise characteristics of Erbium‐fiber technology.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics
08 Faculty of Science > Institute of Applied Physics > Lasers

UniBE Contributor:

Heidt, Alexander; Modupeh Hodasi, Joanna Aba; Rampur, Anupamaa; Spangenberg, Dirk-Mathys; Ryser, Manuel and Feurer, Thomas

Subjects:

600 Technology > 620 Engineering
500 Science > 530 Physics

ISSN:

2045-2322

Publisher:

Springer Nature

Funders:

[4] Swiss National Science Foundation

Language:

English

Submitter:

Alexander Heidt

Date Deposited:

16 Oct 2020 14:39

Last Modified:

18 Oct 2020 02:50

Publisher DOI:

10.1038/s41598-020-73753-2

Related URLs:

BORIS DOI:

10.7892/boris.147022

URI:

https://boris.unibe.ch/id/eprint/147022

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