Narrow Linewidth DFB Lasers Emitting Near a Wavelength of 1064 nm

We report on the realization of narrow linewidth high power DFB diode lasers emitting near 1064 nm in stable longitudinal and lateral single mode. The linewidth is analyzed in dependence of the output power for lasers with cavity lengths of 1 and 2 mm by means of a heterodyne beat note technique. Th...

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Bibliographic Details
Published in:Journal of lightwave technology 2010-09, Vol.28 (17), p.2611-2616
Main Authors: Spiessberger, Stefan, Schiemangk, Max, Wicht, Andreas, Wenzel, Hans, Brox, Olaf, Erbert, Gotz
Format: Article
Language:English
Subjects:
Current noise
Diode lasers
Distributed feedback devices
distributed feedback lasers (DFB)
Emittance
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Holes
Laser feedback
Laser modes
Laser noise
Lasers
linewidth
Noise
Optical feedback
Optical noise
Optical pumping
Optics
Physics
Power generation
Semiconductor device noise
semiconductor laser
Semiconductor lasers
laser diodes
Stimulated emission
Wavelengths
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Summary:We report on the realization of narrow linewidth high power DFB diode lasers emitting near 1064 nm in stable longitudinal and lateral single mode. The linewidth is analyzed in dependence of the output power for lasers with cavity lengths of 1 and 2 mm by means of a heterodyne beat note technique. The minimum intrinsic linewidth is 22 kHz FWHM (full width at half maximum, at 100 μ s time scale) for an output power of 150 mW and a cavity length of 2 mm. The minimum total linewidth is mainly determined by technical noise and corresponds to 234 kHz FWHM at an output power of 70 mW. The influence of current noise on the linewidth is investigated and compared for different cavity lengths. Re-broadening at high output power is only observed for the contribution of technical noise to the linewidth. The intrinsic linewidth shows the theoretically expected 1/P out -dependence at all power levels.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2010.2056913