Amplification oand absorption of an electromagnetic wave in a moderating structure with a paramagnetic crystal
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An analysis of the paramagnetic amplification Ge and absorption Le of an electromagnetic wave in a moderating structure shows that the effects of saturation in some cases are significantly different. In consequence of this, the saturation threshold in the crystal in the amplification mode is lower than the saturation threshold in the absorption mode approximately by a factor of GeM/2Latt. This conclusion must be borne in mind when investigating paramagnetic crystals in distributed structures, in particular when investigating the invesion characteristics of potentially active substances for lasers.
It follows from the analysis that the investigation of the invesion properties of the crystal must be conducted on small samples of the crystal, as the possible error in measuring the inversion coefficient will be less for lower values of the paramagnetic amplification factor (all conditions being equal).
A moderating structure with a radiating paramagnetic crystal is an example of an active medium, in which the wave propagation process can be described and analyzed by means of Eq. (1). As Ep. (1) postulates the solution in analytic form, and all the parameters of the equation have a clear physical meaning and can be monitored easily during the experimental investigation, then the structure considered here obviously can be a suitable model for studying the propagation of waves in other active media (see, e. g., ).
KeywordsWave Propagation Experimental Investigation Electromagnetic Wave Propagation Process Physical Meaning
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