Save Astro World

The energy characteristics of externally pumped Raman lasers are calculated taking inhomogeneities in the active medium into
account. Equations for the power and steady-state lasing threshold in these systems as function of the parameters of the cavity,
pump, and Raman active medium are obtained over the entire ranges of their possible variations. The conditions for applicability
of the model of averaged (uniform) fields, which is widely used in the theory of Raman lasers, are determined and interrelations
among the cavity parameters favor unidirectional lasing in ring cavity Raman lasers are identified.

Content Type Journal ArticlePages 1-8DOI 10.1007/s10812-011-9496-8Authors
P. A. Apanasevich, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, prosp. Nezavisimosti 68, Minsk, 220072 BelarusV. I. Dashkevich, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, prosp. Nezavisimosti 68, Minsk, 220072 BelarusR. V. Chulkov, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, prosp. Nezavisimosti 68, Minsk, 220072 BelarusG. I. Timofeeva, B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, prosp. Nezavisimosti 68, Minsk, 220072 Belarus

Journal Journal of Applied SpectroscopyOnline ISSN 1573-8647Print ISSN 0021-9037

We have obtained quantitative data on the differential (with respect to depth) and the integrated oxyhemoglobin photodissociation
efficiency in the dermis when the skin surface is exposed to a light beam in the wavelength range 300–650

A highly sensitive method is proposed to determine copper(II) ions by forming a stable complex through their interaction with
4-(2′-benzothiazolylazo)-salicylic acid (BTAS) at room temperature and pH of about 5.0. The complex gave a maximum absorption
at λ = 485

We have studied the IR absorption spectra of samples of porous ultrananocrystalline diamond (UNC diamond) obtained by selective
etching of the sp
² phase in UNC diamond films. We show that the surface of porous UNC diamond is polyfunctional. We have studied the behavior
of surface hydride, carbonyl, carboxyl, and hydroxyl groups as a function of annealing temperature in air and the time kept
under normal conditions for UNC diamond films previously oxidized at 430°C–450°C. In the range from a few minutes to a few
months, we studied the kinetics for establishment of the steady state for the functional adsorbed layer on the diamond surface
under normal conditions. The observed growth in the intensity of the transmission bands due to hydride (CH
_x
) and other hydrogen-containing functional groups is explained by dissociation of water molecules on the surface of the UNC
diamond films.

Content Type Journal ArticlePages 1-9DOI 10.1007/s10812-011-9499-5Authors
A. V. Khomich, Fryazino Branch, V. A. Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, 1 pl. Vvedenskogo, Fryazino, 141190 Moscow Oblast, RussiaM. V. Kanzyuba, A. M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow, RussiaI. I. Vlasov, A. M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow, RussiaV. G. Ral’chenko, A. M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow, RussiaN. I. Gorbachuk, Belorussian State University, Minsk, Belarus

Journal Journal of Applied SpectroscopyOnline ISSN 1573-8647Print ISSN 0021-9037

The optical absorption behavior of Tl⁺ doped Rb(Br_1–x
I
_x
) mixed crystals (with x = 0.00, 0.05, and 0.10) grown under vacuum by slow cooling from the melt has been studied. Absorption spectra of the mixed
crystals recorded at room temperature showed that the characteristic A-absorption band of Tl⁺ ions in the Rb(Br_1–x
I
_x
) system (0.1