21 February 2011 Oscillation frequency shifts observed in vertical cavity surface emitting lasers exposed to magnetic fields
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Abstract
As long ago as the 1960s, scientists understood that Diode lasers' oscillation wavelengths showed a significant shift to the shorter wavelength (high frequency) side, when exposed to strong (<4[T]) magnetic fields, at extremely low temperatures (<80[K]). Not surprisingly, then, in preliminary tests, when we exposed Fabry/Perot-type diode lasers oscillating at 780[nm] to weak magnetic fields (<1.4[T]), at room temperature (300[K]), we observed that the oscillation wavelength shifted to the longer (low frequency) wavelength side. In the present work, we used vertical-cavity surface-emitting lasers (VCSEL) to check whether its change into the shorter wavelength side takes place. In discussions of shift mechanisms, we consider how wavelength (frequency) and optical output-power shifts are correlated. Our expanded knowledge base has forced us to use a completely different mechanism to explain how/why our results differ from those obtained in studies conducted in the 1960's. We are now introducing a mechanism that affects a rise in temperature and an increase in the carrier density, affect the characteristic shifts observed in our experiments, when a magnetic field is applied to the laser diodes parallel to the injection current.
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T. Kobayashi, Y. Yamagishi, H. Arai, Y. Matsumoto, T. Sato, M. Ohkawa, "Oscillation frequency shifts observed in vertical cavity surface emitting lasers exposed to magnetic fields", Proc. SPIE 7933, Physics and Simulation of Optoelectronic Devices XIX, 79331O (21 February 2011); doi: 10.1117/12.875851; https://doi.org/10.1117/12.875851
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