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558 documents, page 1 of 56

Anisotropy of the photo-elastic effect in Nd : KGd(WO4) 2 laser crystals

The anisotropy of thermal lensing and the photo-elastic effect is characterized for diodepumped Nd : KGd(WO4)2 crystals cut along the Np and Ng optical indicatrix axes and along its optical axis, O = Ng + 43°, at a laser wavelength of 1067 nm. Distortions in the spatial profile of the output laser beam are analyzed. The thermal lens is astigmatic; the orientation of its principal meridional planes, A and B, is determined by the anisotropy of photo-elastic effect. The thermal lens has opposite...

Photophysical and photochemical properties of potential porphyrin and chlorin photosensitizers for PDT

Structural and optical properties as well as photophysical and photochemical parameters (excited S₁ and T₁ state lifetimes at 77 K and in the presence of O₂ in solution at 293 K; efficiencies of singlet oxygen, ¹Δg, generation) are presented for porphyrins and chlorins with potential for the PDT of cancer: chlorin p₆ and its trimethyl ester, chlorin e₆ and its Na₃ and K₃ salts, purpurin-18 and its monomethylester, 5,10,15,20-tetrakis(3-methoxyphenyl)porphyrin (TPPM), 5,10,15,20-tetrakis(2,4-d...

Viscosity of the dilute solution of flexible polymer molecules

In this paper the statistical theory of viscosity of the dilute solution of flexible polymer molecules is represented

Measuring of depth profile of defects of hot rolled steel sheet by imaging the grating on sheet surface

The approach to measure defect of mill products during their rolling is considered. The performance of supposed scheme is analyzed for real time conditions.

Thermal lens study in diode pumped Ng- and Np-cut Nd:KGd(WO4)2 laser crystals

A comparative study of thermal lensing effect in diode laser pumped Ng- and Np-cut Nd:KGd(WO4)2 (KGW) laser crystals was performed for laser emission polarized along the principle refractive axis, Nm. The thermal lens in the Ng-cut Nd: KGW was found to be weakly astigmatic with a positive refractive power for both the Nm- and Np-directions. For Np -cut Nd:KGW, strong astigmatism was observed and the refractive powers in the Ng- and Nm-directions had opposing signs. The degree of astigmatism w...

The tutorial for post-graduate students, competitors

The tutorial contains necessary material for preparation for examination of a candidate minimum on philosophy and science methodology.