Search results
Results From The WOW.Com Content Network
The laser diode rate equations model the electrical and optical performance of a laser diode. This system of ordinary differential equations relates the number or density of photons and charge carriers ( electrons) in the device to the injection current and to device and material parameters such as carrier lifetime, photon lifetime, and the ...
Laser linewidth is the spectral linewidth of a laser beam. ... The photon-rate equation for a single lasing mode reads [5] ...
In the laser diode rate equations, the photon life time enters instead of the resonator eigenmodes. In this approximative approach, τ p {\displaystyle \tau _{p}} may be calculated from the resonance mode [ 6 ] and is roughly proportional to the strength of the mode within the cavity.
Rate equation. In chemistry, the rate equation (also known as the rate law or empirical differential rate equation) is an empirical differential mathematical expression for the reaction rate of a given reaction in terms of concentrations of chemical species and constant parameters (normally rate coefficients and partial orders of reaction) only ...
Subband populations are determined by the intersubband scattering rates and the injection/extraction current. QCLs are typically based upon a three-level system. Assuming the formation of the wavefunctions is a fast process compared to the scattering between states, the time independent solutions to the Schrödinger equation may be applied and the system can be modelled using rate equations.
Spontaneous emission is the process in which a quantum mechanical system (such as a molecule, an atom or a subatomic particle) transits from an excited energy state to a lower energy state (e.g., its ground state) and emits a quantized amount of energy in the form of a photon. Spontaneous emission is ultimately responsible for most of the light ...
Laser light is a type of stimulated emission of radiation. Stimulated emission is the process by which an incoming photon of a specific frequency can interact with an excited atomic electron (or other excited molecular state), causing it to drop to a lower energy level. The liberated energy transfers to the electromagnetic field, creating a new ...
Lasing threshold. The lasing threshold is the lowest excitation level at which a laser's output is dominated by stimulated emission rather than by spontaneous emission. Below the threshold, the laser's output power rises slowly with increasing excitation. Above threshold, the slope of power vs. excitation is orders of magnitude greater.