Ultraviolet single mode laser light is proposed by frequency quadrupling the output of a Nd:YLF laser with two successive frequency doubling stages. For a simple linear cavity laser configuration investigated at 1312 nm, we have obtained an intracavity power of 310 W for 16 W of absorbed pump power (λp ~ 806 nm). Up to 10 mW tunable single-frequency laser (λ2ω=656-658 nm) is observed. This has been achieved by intracavity second-harmonic generation of a diode-pumped Nd:YLiF4 linear laser oscillating on the σ-polarized 4F3/2-4I13/2 transition (λω ~1314 nm) with a β-Barium Borate (BBO) crystal. We also report the experimental measurement of the red-uv conversion efficiency according to the waist size in the BBO crystal. Obtained value is compared to those given by the Boyd-Kleinman theory.
Ultraviolet single mode laser light is proposed by frequency quadrupling the output of a Nd:YLF laser with two successive frequency doubling stages. For a simple linear cavity laser configuration investigated at 1312 nm, we have optained an intracavity power of 310 W for 16 W of absorbed pump power (λp ~ 806 nm). Up to 10 mW tunable single-frequency laser (λ2W = 656 - 658 nm) is observed. This has been achieved by intracavity second-harmonic generation of a diode-pumped Nd:YLiF4 linear laser oscillating on the σ-polarized 4F3/2-4I13/2 transition (λw ~ 1314 nm) with a β-Barium Borate (BBO) crystal. We also report the experimental measurement of the red-uv conversion efficiency according to the waist size in the BBO crystal. Optained value is compared to those given by the Boyd-Kleinman theory.
KEYWORDS: Skin, Defect detection, RGB color model, Image segmentation, Color image segmentation, Color vision, Light sources and illumination, 3D image processing, Image quality, Visualization
We present in this paper the color segmentation methods that were used to detect appearance defects on 3 dimensional shape of fresh ham. The use of color histograms turned out to be an efficient solution to characterize the healthy skin, but a special care must be taken to choose the color components because of the 3 dimensional shape of ham.
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