Fundamentals of laser dynamics by YA I Khanin

By YA I Khanin

The publication explores the present kingdom of laser dynamics and offers reference facts and uncomplicated experimental evidence for previous and new new release lasers. the main usually used mathematical versions are offered. the writer discusses the explanations for spontaneous incidence of pulsation of the depth of the radiation of solid-state lasers, the effect of the nonstationary nature of parameters and non-linearity of laser parts at the new release features. specified emphasis is put on the issues of low-frequency dynamics of multimode lasers.

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Ideally, the model of a singlemode, homogeneously broadened, travelling-wave laser, as Haken showed [176], is isomorphic to the famous Lorenz model [177], which initiated the study of deterministic chaos in the nonlinear dynamics of dissipative systems. The tenacious attempts to reach this ideal have been crowned by the experiments with far infrared ammonia lasers pumped by shorter-wavelength molecular gas lasers [23, 37–39, 178–186]. The unique feature of this type of lasers is that a large excess over the laser threshold can be achieved when the gain linewidth is less than the cavity passband.

The time of onset of a stable steady state depends on the cavity Qfactor and the excess of the pumping above the laser threshold. In a helium–neon laser this time ranges in 10–6–10–4 s [50–52]. 39 µm. In longer cavities single-mode operation requires the use of mode selectors. Single-mode operation of dye-lasers, the gain lines of which are extremely broad, can never been achieved without wavelength-selective elements. The frequency dependence of the output power of a gas laser has a characteristic feature: fine adjustment of the laser mode to the centre of the gain line produces a local minimum in the power output [53].

Temporal characteristics of a ruby laser operated at the fundamental (TEMooq) mode of a plane-parallel cavity under the conditions of passive stabilization of the device [114]: (a) oscillogram; (b) chronogram of the far-field zone of the laser; (c, d) spectrum chronograms without and with longitudinal mode selection. 31 Fundamentals of Laser Dynamics One way to smooth the induced spatial inhomogeneities of inversion is to provide movement of the laser rod. Experiments with a ‘running medium’ [116–123] showed that the spike-free operation of a ruby laser is possible when the ruby rod moves with a velocity exceeding 20 cm/s.

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