Spectral properties of a broad-area diode laser with off-axis external-cavity feedback

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Abstract

Spectral properties, both the optical spectrum and the intensity noise spectrum, of a broad-area diode laser with off-axis external-cavity feedback are presented. We show that the optical spectrum of the diode laser system is shifted to longer wavelengths due to the external-cavity feedback. The intensity noise spectrum of the diode laser shows that the intensity noise is increased strongly by the external-cavity feedback. External-cavity modes are excited in the external cavity even in the off-axis configuration. The peak spacing of the intensity noise spectrum shows that single roundtrip external-cavity modes are excited. We believe that the four-wave mixing process in the broad-area diode laser is responsible for the establishment of the external-cavity mode.
Original languageEnglish
Article number171112
JournalApplied Physics Letters
Volume103
Issue number17
Number of pages5
ISSN0003-6951
DOIs
Publication statusPublished - 2013

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