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Balle S Tolkachova E San Miguel M Tredicce JR Martín-Regalado J Gahl A 《Optics letters》1999,24(16):1121-1123
We analyze polarization switching in vertical-cavity surface-emitting lasers, taking into account a proper semiconductor frequency-dependent complex susceptibility and spin-flip processes. Thermal effects are included as a varying detuning, and gain differences arise from birefringence splitting. We find that, for large birefringence, gain differences between the two linearly polarized modes are preponderant, and switching occurs owing to thermal shift. For small birefringence polarization switching from the high- to the low-gain mode occurs owing to the combined effect of birefringence and semiconductor phase-amplitude-coupled dynamics for a finite value of the carrier spin-flip rate. 相似文献
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S.?Barland X.?Hachair M.?GiudiciEmail author S.?Balle J. R.?Tredicce G.?Tissoni L.?Spinelli L.?Lugiato M.?Brambilla 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2005,32(1):75-82
We analyze experimentally the spatio-temporal dynamics of the
transverse structures appearing in broad area edge-emitting
semiconductor amplifiers under CW optical injection. We
demonstrate that, in certain conditions, the light reflected by
the system exhibits a multipeaked structure whose dependence on
the parameters suggests an interpretation in terms of
cavity solitons. These structures can exhibit self-pulsations with
periods of the order of few milliseconds, which we explain in
terms of regenerative thermal oscillations. In a particular device,
we generate two single-peak structures which are spatially
uncorrelated, as required for cavity solitons. A microscopic model
shows good agreement with the main body of the experimental
results. 相似文献
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F. Pedaci M. Giudici J.R. Tredicce G. Giacomelli 《Applied physics. B, Lasers and optics》2005,81(7):993-1000
In this work we experimentally study mode-hopping in bulk semiconductor lasers. This stochastic process is ruled by Kramers
statistics with a decay rate depending on the laser parameters of the temperature of the substrate and the pumping current.
For a general combination of these parameters the average residence times in the two active modes are not equal, resulting
in an asymmetric probability distribution for the modal intensities. We show that, by choosing an appropriate path in the
parameter space, we can vary the residence times of the two modes while holding their ratio constant. Along this path, the
shape of modal intensities distributions are constant up to a scaling factor which is a function of the laser parameters.
Then, the system can be described by a single Langevin equation. The effect of adding noise to the pumping current is also
investigated.
PACS 42.65.Sf; 42.55.Sa; 42.50.-p 相似文献
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We study the intensity distribution of a TEM01+10 mode propagating through a single diffraction limited lens. The theoretical intensity distributions along the optical path remain similar until the truncation effects, due to the lens diameter, are negligible. The focal distribution is however very sensitive to truncation, and this is relevant for industrial applications of high power lasers. An experimental system to measure the intensity distribution at the focal plane is described and its results are compared with the theory. 相似文献
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