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Theses

Etude du bruit quantique dans les lasers à semiconducteur et à solide

Abstract : The thesis focuses on the study of quantum noise in semiconductor and solid state lasers. The principle of pump noise suppression is employed together with different methods to reduce the intensity noise. First, edge emitting laser diodes were investigated using different types of line narrowing techniques at room temperature: feedback from an external grating and injection locking. The measured intensity squeezing is 1.6 dB and 2.3 dB respectively. The intensity noise of the laser diodes is shown to result from a cancellation between very large anticorrelated fluctuations of the main mode and of many weak longitudinal side modes. Measurements performed at low temperature point to the relevance of quantum correlations between orthogonal polarised modes. The next step was the investigation of vertical cavity semiconductor lasers (VCSELs). Sub shot noise operation (0.7 dB) is observed in a multimode VCSEL, resulting from very strong anticorrelations between transverse modes. A detailed study of these anticorrelations is performed through the analysis of the transverse spatial distribution of the intensity noise. A Nd:YVO4 microchip laser pumped by a squeezed laser diode was also studied. The effects of the pump noise on the intensity noise of the microchip laser are clearly shown. The implementation of a non-standard feedback loop on the pump laser diode shows evidence for non linear effects in the noise spectrum. Injection locking technique is also successfully employed to suppress the relaxation oscillation noise peak. Finally, an application of intensity squeezed laser diodes is presented. Frequency modulation technique together with sub shot noise laser diodes is employed for detection of absorption signals in a high sensitivity spectroscopy experiment.
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Submitted on : Tuesday, March 7, 2006 - 12:58:43 PM
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  • HAL Id : tel-00011784, version 1

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Alberto Bramati. Etude du bruit quantique dans les lasers à semiconducteur et à solide. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1998. Français. ⟨tel-00011784⟩

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