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Role of thermal effects on the onset of spatially incoherent emission in a broad-area vertical-cavity surface-emitting laser.

Publication date 2009
B-Phot Authors Hugo Thienpont
Citation
G. Craggs, G. Verschaffelt, S. K. Mandre, J. Danckaert, H. Thienpont, and I. Fischer, “Role of thermal effects on the onset of spatially incoherent emission in a broad-area vertical-cavity surface-emitting laser.,” presented at the Proc. Conf. on Lasers and Electro-Optics Eur. Quant. Electron. Conf (CLEO/EQEC), 2009, vol. 15 issue 3, pp. 555–562.
Abstract We present an experimental study of the physical process that leads to spatially incoherent, nonmodal emission in broad-area vertical-cavity surface-emitting lasers. We show that this special emission regime that occurs in pulsed operation of these lasers is due to a combination of a spatially distributed thermal or refractive index gradient (thermal lens) and thermal expansion of the cavity during the pulse (thermal chirp). Our measurements are based on preinstalling a thermal lens through a current bias, and subsequently, modulating a pulse onto the bias. This approach allows us to independently investigate the role of both thermal effects in the onset of nonmodal emission.
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