Effect of vacuum fluctuations on the quantum-mechanical amplitude noise of a laser diode in feedback systems
Abstract
This paper describes an experimental set-up for producing amplitude-squeezed light with noise around 10 dB below the quantum noise threshold of four different feedback systems. The noise power spectrum of the in-loop and out-loop beams is compared for the low-frequency region where classical noise is stronger than quantum noise without the effects of system noise. Results confirm that the quantum-demolition measurement which includes spatial coherence, noise reduction is achieved below the quantum noise limit for in-loop beams, whereas the out-loop beam is not squeezed.
- Publication:
-
Journal of the Optical Society of America B Optical Physics
- Pub Date:
- January 1994
- DOI:
- 10.1364/JOSAB.11.000102
- Bibcode:
- 1994JOSAB..11..102Y
- Keywords:
-
- Laser Outputs;
- Noise Spectra;
- Semiconductor Diodes;
- Semiconductor Lasers;
- Squeezed States (Quantum Theory);
- Vacuum Effects;
- Beam Splitters;
- Low Frequencies;
- Noise Reduction;
- Noise Threshold;
- Lasers and Masers