Hannover 2003 – wissenschaftliches Programm

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Q: Quantenoptik

Q 5: Halbleiter- und Festkörperlaser

Q 5.4: Vortrag

Montag, 24. März 2003, 11:45–12:00, E001

Sub-Shot Noise Light Generation Using a New Master-Slave Semiconductor Laser Configuration — •Tilman Groth and Wolfgang Elsäßer — Darmstadt University of Technology, Institute of Applied Physics, Schlossgartenstrasse 7, 64289 Darmstadt, Germany

One of the common approaches to generating amplitude squeezed light fields is the concept of quiet pumping of semiconductor lasers as demonstrated in [1]. However, it is usually necessary to suppress excess noise caused by mode competition in the laser by using techniques like external cavity feedback or injection locking (e.g. [2]). Instead of an external cavity laser, we use a small-aperture vertical-cavity surface-emitting laser (VCSEL) as master. The locked emission from the edge-emitting quantum well laser that we used as slave shows noise suppression of over 20 dB between 32 and 98 MHz. Squeezing of up to 2 dB below the shot noise is achieved even when both the master and the slave laser operate at room temperature.

[1] Machida et al., Phys. Rev. Lett. 58, 1000 (1987).

[2] Wang et al., Phys. Rev. Lett. 71, 3951 (1993).