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1.3 μm wavelength tunable single-mode laser arrays based on slots

McDermott, Michael, McKenna, Robert, Murphy, Caolán, Mickus, Dovydas, Weng, Hai-Zhong, Naimi, Sepideh, Lu, Qiaoyin, Guo, Wei-Hua, Wallace, Michael, Abadía, Nicolás ORCID: and Donegan, John F. 2021. 1.3 μm wavelength tunable single-mode laser arrays based on slots. Optics Express 29 (10) , pp. 15802-15812. 10.1364/OE.425204

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Two twelve-channel arrays based on surface-etched slot gratings, one with non-uniformly spaced slots and another with uniformly spaced slots are presented for laser operation in the O-band. A wavelength tuning range greater than 40 nm, with a side-mode suppression ratio (SMSR) > 40 dB over much of this range and output power greater than 20 mW, was obtained for the array with non-uniform slots over a temperature range of 15 °C - 60 °C. The introduction of multiple slot periods, chosen such that there is minimal overlap among the side reflection peaks, is employed to suppress modes lasing one free spectral range (FSR) from the intended wavelength. The tuning range of the array with uniformly spaced slots, on the other hand, was found to be discontinuous due to mode-hopping to modes one FSR away from the intended lasing mode which are not adequately suppressed. Spectral linewidth was found to vary across devices with the lowest measured linewidths in the range of 2 MHz to 4 MHz.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Optical Society of America
ISSN: 1094-4087
Date of First Compliant Deposit: 27 May 2021
Date of Acceptance: 24 April 2021
Last Modified: 05 May 2023 00:33

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