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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CJ_14_6

Null-frequency-shift acousto-optic tunable filter for wavelength tuning of a Tm fibre laser

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Abstract

Acousto-optic tunable filters (AOTFs) are used in many applications where fast agile tuning capabilities combined with conservation of spatial coherence are required; such as for selection of wavelength from a broadband source for applications in confocal microscopy, hyperspectral imaging and spectroscopy [1]. For generation of higher spectral intensity they can also be used inside a laser cavity in order to select the operating wavelength [2]. AOTF’s utilise a travelling acoustic wave to diffract phase-matched wavelengths, with the diffracted wave frequency-shifted by the acoustic drive frequency. When used intracavity as a tuning element in a fibre laser, this continual wavelength shift on each pass through the AOTF has a number of undesirable consequences including, poor power stability and, in some situations, pulsing, which can lead to damage.

© 2015 IEEE

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