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A mode-locked diode laser frequency comb for ultracold atomic physics experiments

A mode-locked diode laser frequency comb for ultracold atomic physics experiments
A mode-locked diode laser frequency comb for ultracold atomic physics experiments
This thesis is concerned with the development and characterisation of an actively mode locked diode laser system for the provision of a stable optical frequency comb spanning approximately 1 nm around the D2 spectroscopic line of Rubidium. Through large signal sinusoidal modulation of the laser DC injection current at around 3 GHz, Gaussian pulses of 21 ps are achieved with an associated spectral bandwidth in excess of 1 nm, generating pulses of optimal time-bandwidth product 13. An in-house built air-bearing Michelson interferometer is used to confirm the comb-like structure of the optical emission and a modulation frequency detuning range of 10 MHz is determined.

Through a proof of principle investigation of CW injection locking of the frequency comb, phase coherence of the CW master laser with the modes of the frequency comb is demonstrated over at least 36 GHz. Via CW injection locking, sidemode suppression of 20.6 dB is achieved resulting in an 18% rise in the pulse temporal width and a concomitant reduction in the time-bandwidth product to 1.44, as well as a power dependant phase locking detuning range of up to 370 MHz. In the closing chapters, two CW lasers are shown to be stabilised to the frequency comb via Optical Phase-Locked Loops, a temperature stabilised fibre Mach-Zehnder interferometer is demonstrated for carrier frequency removal from a phase modulated laser, and a novel intra-cavity trace water vapour detection method is introduced.
Woods, Jonathan
b147f9e6-335d-4c87-aa15-5d2024c1c906
Woods, Jonathan
b147f9e6-335d-4c87-aa15-5d2024c1c906
Freegarde, Timothy
01a5f53b-d406-44fb-a166-d8da9128ea7d

(2016) A mode-locked diode laser frequency comb for ultracold atomic physics experiments. University of Southampton, Physical Sciences and Engineering, Doctoral Thesis, 259pp.

Record type: Thesis (Doctoral)

Abstract

This thesis is concerned with the development and characterisation of an actively mode locked diode laser system for the provision of a stable optical frequency comb spanning approximately 1 nm around the D2 spectroscopic line of Rubidium. Through large signal sinusoidal modulation of the laser DC injection current at around 3 GHz, Gaussian pulses of 21 ps are achieved with an associated spectral bandwidth in excess of 1 nm, generating pulses of optimal time-bandwidth product 13. An in-house built air-bearing Michelson interferometer is used to confirm the comb-like structure of the optical emission and a modulation frequency detuning range of 10 MHz is determined.

Through a proof of principle investigation of CW injection locking of the frequency comb, phase coherence of the CW master laser with the modes of the frequency comb is demonstrated over at least 36 GHz. Via CW injection locking, sidemode suppression of 20.6 dB is achieved resulting in an 18% rise in the pulse temporal width and a concomitant reduction in the time-bandwidth product to 1.44, as well as a power dependant phase locking detuning range of up to 370 MHz. In the closing chapters, two CW lasers are shown to be stabilised to the frequency comb via Optical Phase-Locked Loops, a temperature stabilised fibre Mach-Zehnder interferometer is demonstrated for carrier frequency removal from a phase modulated laser, and a novel intra-cavity trace water vapour detection method is introduced.

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More information

Published date: January 2016
Organisations: University of Southampton, Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 388517
URI: http://eprints.soton.ac.uk/id/eprint/388517
PURE UUID: 212c8140-74fe-4f7a-8891-2b2237f7abb7
ORCID for Timothy Freegarde: ORCID iD orcid.org/0000-0002-0680-1330

Catalogue record

Date deposited: 29 Feb 2016 12:13
Last modified: 06 Jun 2018 12:45

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Contributors

Author: Jonathan Woods
Thesis advisor: Timothy Freegarde ORCID iD

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