QUANTUM-CORRELATED LIGHT FROM TRANSVERSE JUNCTION STRIPE LASER-DIODES

We report on the generation of quantum-correlated light beams emitted from a pair of electrically coupled transverse junction stripe (TJS) l aser diodes. We also report the measurement of sub-shot noise ('quiet' ) light emitted by each of these laser diodes when driven from a high impedance lent noise cui rent source. The measured cross-correlation c oefficients between the intensity fluctuations in the two beams and th e measured noise reduction of 3 dB below the normal shot noise level a re both consistent with the measured quantum transfer efficiencies of approximately 50%. These measurements show that TJS laser diodes provi de another method (in addition to the use of optical parametric oscill ators and electrically coupled light emitting diodes) for generating t win light beams with intensity difference fluctuations below the norma l shot noise level. Potential applications include low noise spectrosc opy and interferometry.