The processes of formation and digital recording of interference patterns arising in partially coherent polychromatic light in the course of interference monitoring of surface microrelief in objects having stratified volume structure are considered. The expressions for the intensity distribution in the interference pattern depending on the surface relief and the object structure are derived taking the spectral properties of the photodetector array into account. The results of numerical simulation of interference fringes in polychromatic light and experimentally measured digital white light microinterferograms are presented. These results demonstrate the agreement between the theoretical model and the experimental interferograms and the possibility of solving the direct problem of low-coherence interferometry using numerical simulation of the interference pattern.
Polarization investigation of the emission spectrum of Nd ions at the 4 F 3/2 → 4 I 11/2 transition in the b-cut Nd 3+ :YAlO 3 crystal showed that this gain medium is promising for multiwavelength laser operation. A diode-pumped continuous-wave Nd 3+ :YAlO 3 laser with an intracavity retardation plate and a dichroic output coupler demonstrated dual-wavelengths operation at 1064.5 & 1072.6 nm and 1072.6 & 1079.5 nm, as well as triple-wavelengths lasing at 1064.5 & 1072.6 &1079.5 nm. Low intra-cavity losses in the retardation plate allowed achieving a high laser efficiency close to that of a single-wavelength laser. The output power of the triple-wavelength laser reached 1.75 W under a pump power of 6.7 W with a slope conversion efficiency of 32.3 %.
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