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We report detailed measurements of the pump-current dependency of the self-pulsating frequency of semiconductor CD lasers. A distinct kink in this dependence is found and explained using rate-equation model. The kink denotes a transition between a region where the self-pulsations are weakly sustained relaxation oscillations and a region where Q-switching takes place. Simulations show that spontaneous emission noise plays a crucial role for the cross-over.
Revtex, 16 pages, 7 figures
FOS: Physical sciences, SDG 7 - Affordable and Clean Energy, Physics - Optics, Optics (physics.optics)
FOS: Physical sciences, SDG 7 - Affordable and Clean Energy, Physics - Optics, Optics (physics.optics)
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