Schulz-Ruhtenberg, M. and Tanguy, Y. and Huang, K.F. and Jager, R. and Ackemann, T. (2009) Control of the spatial emission structure of broad-area vertical-cavity surface-emitting lasers by feedback. Journal of Physics D: Applied Physics, 42 (5). ISSN 0022-3727Full text not available in this repository. (Request a copy from the Strathclyde author)
The wave number of transverse spatial structures in broad-area vertical-cavity surface-emitting lasers (VCSELs) is controlled via frequency-selective feedback from an external self-imaging cavity in a broad range of wave numbers and emission frequencies. The selected states follow the dispersion curves of the free-running laser. A control range of about 2.5 µm−1 in spatial frequency space and 2.5 nm in emission wavelength was obtained for square VCSELs and of about 3 µm−1 and 8 nm for circular VCSELs having a different dispersion curve. By spatial filtering in Fourier space, the shape of the structures can also be controlled to some extent. It is argued that the feedback techniques are useful to 'probe' emission states of the free-running laser.
|Keywords:||semiconductor lasers, laser diodes, resonators, cavities, amplifiers, arrays, beam characteristics, beam intensity, spatial pattern formation Optics, quantum optics, lasers, Optics. Light, Surfaces, Coatings and Films, Acoustics and Ultrasonics, Electronic, Optical and Magnetic Materials, Condensed Matter Physics|
|Subjects:||Science > Physics > Optics. Light|
|Department:||Faculty of Science > Physics|
|Depositing user:||Strathprints Administrator|
|Date Deposited:||25 Oct 2010 08:58|
|Last modified:||04 May 2016 15:58|