Quantum intensity noise of laser diodes and nonorthogonal spatial eigenmodes

Quantum noise in a laser with nonorthogonal polarization modes

We describe the quantum-noise behavior of a laser that has nonorthogonal polarization modes. The nonorthogonality of the modes leads to excess quantum noise. Theoretically, we derive the excess noise dynamics of the laser, including the saturation of the gain medium. Experimentally, we have measured the noise dynamics in the polarization, intensity and phase degrees of freedom of a 3.51-mm HeXe...

Quantum fluctuations in very small laser diodes

Quantum fluctuations play a critical role in determining the steady-state and transient response of a laser when there is a small number of particles in the system. These fluctuations, and the fact that a lowest energy state of the system exists, can suppress lasing and enhance spontaneous emission around threshold. Dynamic switching between two characteristic system states can dominate the flu...

Low Frequency Noise Characteristics of Multimode and Singlemode Laser Diodes

Resonant-cavity light-emitting diodes: quantum noise and spatial emission characteristics

We demonstrate the interplay between the intensity noise and the spatial emission characteristics of resonant-cavity light-emitting diodes. First, we find that the total aperture intensity noise exhibits a sub-shot noise behavior in a quite large pumping regime. Second, we investigate the angular, spectral, and spatial emission characteristics of the devices by controlling the shape and width o...

Modulation Response and Relative Intensity Noise Spectra in Quantum Cascade Lasers

Static properties, relatively intensity noise and intensity modulation response in quantum cascade lasers (QCLs) studied theoretically in this paper. The present rate equations model consists of three equations for the electrons density in the conduction band and one equation for photons density in cavity length. Two equations were derived to calculate the noise and modulation response. Calcula...