Curtis, E A; Bradley, T; Barwood, G P; Edwards, C S; Wheeler, N V; Phelan, R; Richardson, D J; Petrovich, M N; Gill, P (2018) Laser frequency stabilization and spectroscopy at 2051 nm using a compact CO2-filled Kagome hollow core fiber gas-cell system. Optics Express, 26 (22). pp. 28621-28633. ISSN 1094-4087

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Abstract

We describe a compact, all fiber, frequency stabilized diode laser system at 2051 nm using CO2 gas-filled Kagome hollow core fiber (HCF) and capable of tuning over four transitions in 12C16O2. This laser system has been designed for use in future space-based atmospheric monitoring using DIAL. The fully spliced Kagome HCF gas cell is filled to 2 kPa CO2 partial pressure and we compare the observed CO2 features with those calculated using HITRAN. In this fully sealed gas cell configuration no pressure degradation was observed during a ~15-month period in which frequency stability measurements were acquired. We characterize the frequency stability of the system by beat frequency comparison against a reference laser. Results are presented for the laser locked to the center of the 12C16O2 R(30) transition, with frequency stability of ~40 kHz or better at 1 s, and a frequency reproducibility at the 0.4-MHz level over a period of > 1 month. For the DIAL application, we also demonstrate two methods for producing a lock ~3 GHz from this line.

Item Type:	Article
Keywords:	Hollow core fibre, Kagome, frequency stabilisation, DIAL, greenhouse gas, environmental monitoring, CO2, 2051 nm
Subjects:	Time and Frequency > Time
Divisions:	Quantum Science
Identification number/DOI:	10.1364/OE.26.028621
Last Modified:	07 Jan 2019 14:23
URI:	http://eprintspublications.npl.co.uk/id/eprint/8191

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