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

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dc.contributor.authorDavis, Nicholas M.
dc.contributor.authorLynch, S. F.
dc.contributor.authorGates, J. C.
dc.contributor.authorHodgkinson, Jane
dc.contributor.authorSmith, P. G. R.
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2019-10-01T15:28:51Z
dc.date.available2019-10-01T15:28:51Z
dc.date.issued2019-09-25
dc.description.abstractWe present the development of an external cavity Bragg grating stabilized 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 characterization of its performance for the purpose of spectroscopic measurement of methane at this wavelength using a 25 cm path-length 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 = 8.3 × 10−5 AU was achieved, which is consistent with the performance of standard distributed feedback lasers. The new device exhibits a side-mode suppression ratio of −40 dB and a low RIN of <−150 dB/Hz, and thus avoids the high levels of noise or instability normally associated with larger, mechanically driven external cavity lasers. The silica-on-silicon platform has the potential for low-volume manufacturing of special lasers at the custom wavelengths required for gas detection, without the need for investment in foundry solutions.en_UK
dc.identifier.citationDavis NM, Lynch SF, Gates JC, et al., (2019) Spectroscopic gas detection using a Bragg grating - stabilized external cavity laser, custom written in planar integrated silica-on-silicon. Optics Express, Volume 27, Issue 20, pp. 29034-29044en_UK
dc.identifier.cris24662174
dc.identifier.issn1094-4087
dc.identifier.urihttps://doi.org/10.1364/OE.27.029034
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14579
dc.language.isoenen_UK
dc.publisherOptical Society of Americaen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleSpectroscopic gas detection using a Bragg grating - stabilized external cavity laser, custom written in planar integrated silica-on-siliconen_UK
dc.typeArticleen_UK

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