Spectral linewidth of a free-running continuous-wave single-frequency external-cavity quantum-well InGaAs/AlGaAs diode laser

Long Hsu*, A. Mooradian, R. L. Aggarwal

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The linewidth of a room-temperature free-running 940-nm cw single-frequency 1-mm-long quantum-well InGaAs/AlGaAs diode laser in a 10-cm-long external cavity has been measured as a function of the output power by the heterodyne technique. The power-dependent component of the observed Lorentzian linewidth displays a linewidth –power product of 28 ± 4 k Hz mW, which is 2 orders of magnitude larger than that predicted from the spontaneous emission model. The shot-noise model of Welford and Mooradian [Appl. Phys. Lett. 40, 560 (1982)] for the power-independent linewidth has been extended to account for the observed power-dependent linewidth.

Original languageEnglish
Pages (from-to)1788-1790
Number of pages3
JournalOptics Letters
Volume20
Issue number17
DOIs
StatePublished - 1 Jan 1995

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