研究目的
To demonstrate once more the effect of spontaneous emission on the output spectrum of a diode laser with allowance for distinctive features of its parameters, using a consistent analysis (in semiclassical theory) based on Maxwell’s equations.
研究成果
The study demonstrates that applying Maxwell’s equations to the diode laser leads to a van der Pol-type equation which has a nontrivial solution without any extra emission sources. Taking into account spontaneous emission makes the physical model of the diode laser more realistic, replacing perfectly monochromatic light with quasi-monochromatic light that has a finite spectral width due to spontaneous emission. Expressions for the spectral densities of phase and amplitude fluctuations and the spectral density of electron concentration fluctuations have been found, all expressed through diode laser parameters that can be found from independent experiments or calculated if the diode cavity configuration is known.
研究不足
The study is limited to the steady-state optical spectrum of a diode laser and does not consider possible transient modes. The analysis assumes that the field amplitude varies no faster than in 10–13 s, which may not account for all dynamic behaviors of the laser system.
