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Spectroscopic gas detection using a Bragg grating - stabilized external cavity laser, custom written in planar integrated silica-on-silicon

Spectroscopic gas detection using a Bragg grating - stabilized external cavity laser, custom written in planar integrated silica-on-silicon
Spectroscopic gas detection using a Bragg grating - stabilized external cavity laser, custom written in planar integrated silica-on-silicon
We present the development of an external cavity Bragg grating stabilised laser for tunable diode laser spectroscopy (TDLS). Our design uses a planar integrated silica-on-silicon platform incorporating a custom written Bragg grating as the wavelength-selective element of the laser cavity. We have developed a prototype singlemode laser at 1651 nm and performed a detailed characterisation of its performance for the purpose of spectroscopic measurement of methane at this wavelength using a 25 cm pathlength single-pass cell. Mode hop-free tuning of 0.13 nm has been demonstrated at frequencies of up to 10 kHz. A single-point limit of detection for TDLS of ΔI/I0 = 8.3x10-5 AU was achieved, which is consistent with the performance of standard distributed feedback lasers. The new device exhibits a sidemode suppression ratio of -40 dB and a low RIN of <-150 dB/Hz, thus avoiding the high levels of noise or instability normally associated with larger, mechanically driven external cavity lasers. The silica-on-silicon platform has potential for low-volume manufacturing of specialist lasers at the custom wavelengths required for gas detection, without the need for investment in foundry solutions.
1094-4087
29034-29044
Davis, N.M.
b4b5ad73-58bd-4351-8ae9-ef1ceaf65996
Lynch, S.G.
cb5a2801-5325-4b19-b0b7-2ee8657db30f
Gates, J.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Hodgkinson, J.
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Smith, P.G.R.
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Tatam, R.P.
e2a442ec-225f-4373-8c2b-bcef387026ff
Davis, N.M.
b4b5ad73-58bd-4351-8ae9-ef1ceaf65996
Lynch, S.G.
cb5a2801-5325-4b19-b0b7-2ee8657db30f
Gates, J.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Hodgkinson, J.
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Tatam, R.P.
e2a442ec-225f-4373-8c2b-bcef387026ff

Davis, N.M., Lynch, S.G., Gates, J., Hodgkinson, J., Smith, P.G.R. and Tatam, R.P. (2019) Spectroscopic gas detection using a Bragg grating - stabilized external cavity laser, custom written in planar integrated silica-on-silicon. Optics Express, 27 (20), 29034-29044. (doi:10.1364/OE.27.029034).

Record type: Article

Abstract

We present the development of an external cavity Bragg grating stabilised laser for tunable diode laser spectroscopy (TDLS). Our design uses a planar integrated silica-on-silicon platform incorporating a custom written Bragg grating as the wavelength-selective element of the laser cavity. We have developed a prototype singlemode laser at 1651 nm and performed a detailed characterisation of its performance for the purpose of spectroscopic measurement of methane at this wavelength using a 25 cm pathlength single-pass cell. Mode hop-free tuning of 0.13 nm has been demonstrated at frequencies of up to 10 kHz. A single-point limit of detection for TDLS of ΔI/I0 = 8.3x10-5 AU was achieved, which is consistent with the performance of standard distributed feedback lasers. The new device exhibits a sidemode suppression ratio of -40 dB and a low RIN of <-150 dB/Hz, thus avoiding the high levels of noise or instability normally associated with larger, mechanically driven external cavity lasers. The silica-on-silicon platform has potential for low-volume manufacturing of specialist lasers at the custom wavelengths required for gas detection, without the need for investment in foundry solutions.

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More information

Submitted date: 2019
Accepted/In Press date: 6 August 2019
e-pub ahead of print date: 25 September 2019
Published date: 30 September 2019

Identifiers

Local EPrints ID: 430501
URI: http://eprints.soton.ac.uk/id/eprint/430501
ISSN: 1094-4087
PURE UUID: edafae71-5582-4371-8121-83aa3d680a66
ORCID for J. Gates: ORCID iD orcid.org/0000-0001-8671-5987
ORCID for P.G.R. Smith: ORCID iD orcid.org/0000-0003-0319-718X

Catalogue record

Date deposited: 02 May 2019 16:30
Last modified: 07 Oct 2020 01:45

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