Z-scan measurements of nonlinear refraction and Kerr-lens mode-locking with Yb3+:KY(WO4)2

The nonlinear refractive index n₂ of Yb³⁺:KY(WO₄)₂ crystal has been measured using picosecond Z-scan technique. The magnitude of n₂ was found to be 8.7 × 10^–16 cm²/W at wavelength of 1.08 m. The numerical modeling based on fluctuation model showed a great potential of this crystal as active medium for Kerr-lens mode-locking.     

PbS-doped phosphate glasses saturable absorbers for 1.3-μm neodymium lasers

Passive mode locking and saturable absorber Q-switching of neodymium lasers at 1.3 μm with PbS-doped phosphate glasses are demonstrated. Q-switched pulses of 120 ns (0.1 μJ) in duration (energy) and the average output power of 3 mW from a quasi-cw diode-pumped Nd³⁺:KGW laser and ultrashort pulses of a maximum of 250 μJ in energy and 150 ps in duration from a Nd³⁺:YAP laser were obtained. The bleaching decay rate of the samples was found to increase with the Quantum Dot’s size decreasing due to the enhancement of quantum confinement effects for smaller dots and stronger overlapping of the electron and trap state wave functions. Received: 23 January 2002 / Revised version: 2 April 2002 / Published online: 20 December 2002 RID="*" ID="*"Corresponding author. Fax: +375-17/232-6286, E-mail: savitski@eudoramail.com     

Magnetic spectra of amorphous ferromagnets

A model is proposed which explains the frequency dependence of the magnetic permeability in magnetically soft amorphous ribbons.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizikov, No. 7, pp. 27–30, July, 1986.     

Optical properties and structure of ultradispersed particles of CuInSe2x Te2(1−x) in a silicate glass matrixin a silicate glass matrix

We investigate silicate glasses that contain nanodimensional particles of the ternary semiconductor compounds CuInSe₂ and CuInTe₂ and the solid solution CuInSeTe. Based on the data of x-ray examination, it is assumed that the particles of the indicated compounds have a cubic lattice rather than the tetragonal one typical of these compounds in a macroscopic state. In the spectra of optical absorption of the glasses (irrespective of the dimensions of the particles) there is a band at λ_max ≈ 550 nm which can be associated with partial oxidation of copper on the surface of the glasses. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 3, pp. 350–354. May–June, 2000.