Polarization-dependent noise in photon-number squeezed light generated by quantum-well lasers.

Amplitude noise spectra from the nonclassical output of an injection-locked low-temperature quantum-well laser analyzed along orthogonal polarization axes reveals correlated polarization-dependent noise. Using polarization-preserving balanced homodyne detection to suppress these effects, we demonstrate photon-number fluctuations 4.5 dB below the semiclassical shot-noise limit (within 95% of the expected squeezing based on the device efficiency).

Room-temperature amplitude-squeezed light from an injection-locked quantum-well laser with a time-varying drive current.

We demonstrate the conversion of a time-varying (50-400-MHz) electrical current into an optical power with fidelity 0.8 dB (1.35 dB after correction for detection efficiency) beyond the standard quantum limit by drive-current modulation of an injection-locked quantum-well laser.

Amplitude-squeezed light from quantum-well lasers.

High-impedance pump noise suppression was used to generate amplitude squeezing in an index-guided quantumwell laser. Light exhibiting photon-number noise 1.4 dB below the shot-noise limit was observed, and the corresponding polarization properties were examined.

12.5-W continuous-wave monolithic laser-diode arrays.

Continuous-wave output power levels of 12.5 W from one facet and power-conversion efficiencies as high as 42% have been obtained from a 1-cm monolithic AlGaAs laser array. The array consists of twenty 10-stripe lasers.

Fiber-bundle coupled, diode end-pumped Nd:YAG laser.

The output of seven laser-diode arrays, combined by a bundle of seven optical fibers, was used to end pump a Nd:YAG solid-state laser. Under a rated operation of 1 A/diode, maximum TEM(00) single-mode output power of 660 mW was obtained with 4.4% total electrical-to-optical conversion efficiency.