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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 6 — Mar. 15, 2014
  • pp: 1685–1688

1/f noise in external-cavity InGaN diode laser at 420  nm wavelength for atomic spectroscopy

X. Zeng and D. L. Boïko  »View Author Affiliations


Optics Letters, Vol. 39, Issue 6, pp. 1685-1688 (2014)
http://dx.doi.org/10.1364/OL.39.001685


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Abstract

We have extensively studied the frequency noise and relative intensity noise spectra in a tunable external-cavity InGaN diode laser at blue (420 nm) wavelengths. We report flicker (1/f) frequency-noise behavior at low Fourier frequencies measured using offset frequency-absorption spectroscopy on Rb85 vapor cells, which yields an estimated lasing linewidth of 870 kHz. From considerations of high-dislocation density in III nitride epitaxy, 1/f noise and linewidth were expected to be larger than in conventional III-V lasers. Surprisingly, the measured noise characteristics are comparable to or better than those of near-infrared distributed feedback lasers and external-cavity diode lasers. The noise-reduction mechanism is attributed to the wavelength dependence of 1/f noise. We discuss challenges in atomic spectroscopy applications caused by defects and mode-clustering effect in GaN lasers. Using the Hakki–Paoli analysis in an aged laser diode, we provide possible explanation about the origin of observed mode clustering.

© 2014 Optical Society of America

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(140.3600) Lasers and laser optics : Lasers, tunable
(140.7300) Lasers and laser optics : Visible lasers
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(300.6260) Spectroscopy : Spectroscopy, diode lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: February 5, 2014
Manuscript Accepted: February 6, 2014
Published: March 14, 2014

Citation
X. Zeng and D. L. Boïko, "1/f noise in external-cavity InGaN diode laser at 420  nm wavelength for atomic spectroscopy," Opt. Lett. 39, 1685-1688 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-6-1685


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