|B-Phot Authors||Hugo Thienpont|
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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