Yu. Andreev

Cascaded carbon monoxide laser frequency conversion into the 4.3–4.9 μm range in a single ZnGeP 2 crystal

Collinear cascaded mid-IR frequency conversion in a single nonlinear optical crystal was accomplished. Concurrent collinear generation of the sum frequency of multiline fundamental band carbon monoxide laser radiation as a first frequency conversion cascade resulted in collinear difference frequency generation within the 4.3 to 4.9 μm spectral range when mixing this sum frequency radiation with the fundamental one as the second cascade in the same ZnGeP(2) nonlinear optical crystal.

Sleptons at post-WMAP benchmark points at LHC (CMS)

We study a possibility to detect sleptons at post-WMAP benchmark points at LHC(CMS). We find that at

Parametric Frequency Converters Based on New Nonlinear Crystals

L_{tot}=30 fb^{-1}

Characterization of Bridgman grown GaSe:Al crystals

it would be possible to detect sleptons at points A, B, C, D, G. We also investigate the production and decays of right and left sleptons separately. We find that at

Frequency doubling and mixing of the radiation of carbon monoxide lasers in nonlinear ZnGeP 2 and GaSe crystals

L_{tot}=30 fb^{-1}

Beam-path gas analyzer based on a tunable CO2 laser with frequency doubling

it would be possible to detect right sleptons with a mass up to 200 GeV and left ones with a mass up to 300 GeV.We study the possibility of detecting sleptons at post-WMAP benchmark points at LHC (CMS). We find that, at Ltot = 30 fb−1, it would be possible to detect sleptons at points B, C, D, G. We also investigate the production and decays of right and left sleptons separately. We find that, at Ltot = 30 fb−1, it would be possible to detect right sleptons with a mass up to 200 GeV and left ones with a mass up to 300 GeV.

Using the e ± µ∓ + E T miss signature in the search for supersymmetry and lepton-flavor violation in neutralino decays

Results of investigations into the physical properties of a number of new nonlinear crystals are presented. The parameters of frequency converters manufactured on their basis are compared, and second-harmonic generation of CO2 lasers first excited by frequency conversion in LiInSe2, AgGa1– xInxSe2, AgxGaxGexS2(1 + x), and Hg1–xCdxGa2S4 crystals is investigated. The superiority of HgGa2S4, Hg1–xCdxGa2S4, and AgGa1–xInxSe2 over the well-known crystals has been demonstrated for frequency conversion both within the middle-IR range and from the visible range to the middle-IR range. Advantages of LiInSe2 and AgGa1–xInxSe2 crystals are demonstrated for the direct frequency conversion of femtosecond laser radiation to the middle-IR range compared to the cascade frequency conversion and direct frequency conversion in LiInS2 crystals.

LBO: optical properties and potential for THz application

Centimeter-sized Al-doped nonlinear GaSe crystals were grown by the modified Bridgman method with heat field rotation. The alumina distribution coefficient in the grown crystals was estimated to be about 8 × 10−2 for GaSe:Al (≥0.1 at%) crystals. GaSe:Al (≤0.5 at%) crystals possess optical properties suitable for non-linear applications. For the first time the increase in the ordinary refractive index of GaSe crystals with doping was demonstrated to be different to other doped GaSe crystals.

Dispersion properties of GaS studied by THz-TDS

Frequency doubling of the radiation of selective and nonselective carbon monoxide lasers in nonlinear ZnGeP2and GaSe crystals has been experimentally investigated. An internal frequency-conversion efficiency as high as 7% has been obtained, with enrichment of the spectrum of the converted frequencies due to the parallel process of sum-frequency generation. The possibility is discussed of using the methods of nonlinear crystal optics to create a broad-range coherent-radiation source in the mid-IR and terahertz ranges of the spectrum, based on carbon monoxide lasers.

Interaction of high intensity optical pulses with modified nonlinear GaSe crystals

In an attempt to bring the high power and versatility of carbon dioxide lasers to bear on atmospheric measurements for pollutants such as carbon monoxide, nitrogen oxides, and sulfur dioxide, the authors propose parametric frequency converters for carbon dioxide laser radiation in the spectral range required. Field measurements are discussed of the densities of a number of atmospheric gas components, including CO, and of the transparency of the atmosphere to beam paths using a beam-path gas analyzer containing a frequency doubler for a carbon dioxide laser based on the zinc phosphide-germanium phosphide monocrystal. The KAMAK MERA-60 computer system 23 does programmed tuning of the carbon dioxide laser radiation wavelength by rotation of a diffraction grating.