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Diffusive Propagation of Phonon Beams in Yttrium Aluminum Garnets Containing Substitutional Rare Earth Atoms

100%

Ivanov S., Khazanov E., Paszkiewicz T., Taranov A., Wilczyński M.

Acta Physica Polonica A

1995

vol. 87

issue 2

381-386

The diffusive maxima of phonon signals are studied for a number of solid solutions of rare earth atoms in yttrium aluminum garnets. The used exact formula for the diffusion constants allows for qualitative discussion of the obtained results. The established energy of phonons, forming the diffusive maximum of phonon signal of the temperature T_{H} arriving at the bolometer, ranges from 3.2k_{B}T_{H} to 4.2k_{B}T_{H}, which is in reasonable agreement with the existing estimations. The qualitative analysis allows us to estimate the contribution, made by the rare earth ions occupying the octahedral positions of the sixfold oxygen coordination, to the scattering of phonons due to lattice imperfections in yttrium aluminum garnets.

Adaptive Optical Delay Lines for Femtosecond Laser Pulses Shaping

59%

Molchanov V., Chizhikov S., Makarov O., Solodovnikov N., Ginzburg V., Katin E., Khazanov E., Lozhkarev V., Yakovlev I., Epatko I., Serov R.

Acta Physica Polonica A

2009

vol. 116

issue 3

355-358

The paper is devoted to investigation of adaptive optical delay lines, intended for femtosecond pulse shaping. Experiments were performed in the sub PW laser system, based on optical parametrical chirped pulse amplification. The experimental device has revealed high spectral resolution (0.6 nm at 1250 nm) high efficiency, (70% over a 120 nm spectral width at 1250 nm) and flexibility of seed pulse amplitude control. Proper shaping of the transmission function of adaptive optical delay line allows to double the femtosecond pulse spectrum band width.

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2 Acta Physica Polonica A

1 2009

1 1995

2 Khazanov E.

1 Chizhikov S.

1 Epatko I.

1 Ginzburg V.

1 Ivanov S.

1 Katin E.

1 Lozhkarev V.

1 Makarov O.

1 Molchanov V.

1 Paszkiewicz T.

1 Serov R.

1 Solodovnikov N.

1 Taranov A.

1 Wilczyński M.

1 Yakovlev I.

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Diffusive Propagation of Phonon Beams in Yttrium Aluminum Garnets Containing Substitutional Rare Earth Atoms

Adaptive Optical Delay Lines for Femtosecond Laser Pulses Shaping