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Proceedings Paper

A stretched-pulse mode-locked laser source at a central wavelength of 1275 nm
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Paper Abstract

This study presents a time-stretched wavelength-swept laser source based on stretched-pulse mode-locking. A broadband semiconductor optical amplifier (SOA) technology is used as an optical gain element. The laser comprises a unidirectional ring cavity with matched positive and negative continuously chirped fiber Bragg gratings (FBG’s). One FBG generates a total positive dispersion of 454 ps/nm at 1275 nm and the other chirped FBG generates a total negative dispersion of -454 ps/nm at 1275 nm. A high-extension lithium-niobate intensity modulator (>30dB extinction at 1275 nm, 4.9 dB loss at maximum transmission) is driven with short pulses by a bit pattern generator providing approximately 0.235 ns full-width at half-maximum pulse profiles. These pulses are stretched, amplified, and compressed within the ring cavity, and the modulator pulsing is synchronized to a harmonic of the cavity round trip time. The laser output is provided from the cavity by a 25% coupler. The output light is amplified by another SOA. The laser source provides a sweeping range of approximately 90 nm centered at around 1275 nm at a repetition rate of ~5 MHz. This yields an estimated axial resolution of 8 μm in air.

Paper Details

Date Published: 2 March 2020
PDF: 4 pages
Proc. SPIE 11266, Laser Resonators, Microresonators, and Beam Control XXII, 112661G (2 March 2020); doi: 10.1117/12.2544370
Show Author Affiliations
Ibrahim Akkaya, Izmir Biomedicine and Genome Ctr. (Turkey)
Onur Caki, Izmir Biomedicine and Genome Ctr. (Turkey)
Serhat Tozburun, Izmir Biomedicine and Genome Ctr. (Turkey)
Izmir International Biomedicine and Genome Institute (Turkey)
Dokuz Eylul Univ. (Turkey)

Published in SPIE Proceedings Vol. 11266:
Laser Resonators, Microresonators, and Beam Control XXII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko; Andrea M. Armani, Editor(s)

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