Long-term wavelength stabilisation of widely modulated lasers

Kieran B. Wiseman; Thomas Kissinger; Ralph P. Tatam

doi:10.1117/12.2673684

15 August 2023 Long-term wavelength stabilisation of widely modulated lasers

Kieran B. Wiseman, Thomas Kissinger, Ralph P. Tatam

Proceedings Volume 12618, Optical Measurement Systems for Industrial Inspection XIII; 1261816 (2023) https://doi.org/10.1117/12.2673684
Event: SPIE Optical Metrology, 2023, Munich, Germany

Abstract

In this paper, we present a novel technique for stabilisation of widely wavelength modulated lasers (>100pm) over long time scales, where modulation depths exceed the spectral width of standard reference features, such as gas absorption lines, by over an order of magnitude. The technique operates by controlling the temporal separation between successive appearances of a gas absorption line on the up and down sweeps of a sinusoidal laser wavelength modulation waveform. The influence of the signal distortions introduced by the laser intensity modulation that are associated with laser diode injection current modulation are also addressed. The technique is applied to a range-resolved interferometric system interrogating a Mach-Zehnder interferometer operating in thermally stable conditions, using an absorption feature from a fibre-coupled gas cell as a reference. Proof-of-principle measurement results achieved using this technique are presented, demonstrating a notional fractional stability of 3.9×10⁻⁷ without further correction.

Conference Presentation

Citation Download Citation

Kieran B. Wiseman, Thomas Kissinger, and Ralph P. Tatam "Long-term wavelength stabilisation of widely modulated lasers", Proc. SPIE 12618, Optical Measurement Systems for Industrial Inspection XIII, 1261816 (15 August 2023); https://doi.org/10.1117/12.2673684

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