摘要:

Charged particle acceleration in a laser beam with a superimposed cyclotron motion is considered. The energy aborption process is analysed using an exact quantum mechanical description of the particle motion. The results permit a simple quantum mechanical interpretation of energy absorption under a cyclotron resonance regime.

ISSN:0030-3909    

DOI:10.1080/713821068

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A novel distributed feedback (DFB) colour centre laser is proposed. The feedback mechanism is provided by the periodic spatial modulation of the refractive index which is induced by applying an acoustic wave to the crystal coloured by X-ray irradiation. Numerical estimates for this method are also presented.

ISSN:0030-3909    

DOI:10.1080/713821067

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713821065

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/716099606a

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713821077

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713821076

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Some expressions for the e.m. field diffracted by an absorbing circular cylinder of large radius in the Fresnel region are developed. Until recently results were available only for the far field of ‘good conductors’. The derived equations agree with Young's theory of diffraction since the diffracted field may be expressed as two cylindrical waves which seem to arise from the two ‘edges’ of the cylinder. Numerical calculations are also presented and compared with previous experimental results.

ISSN:0030-3909    

DOI:10.1080/713821070

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

An approximate ray picture has been presented for attenuated total reflection of a plane electromagnetic wave from a weakly absorbing dielectric. An analytical expression for the reflection coefficient has been obtained for an angle of incidence larger than the critical angle. The method of limiting absorption is seen to establish the Carter-Hora conjecture regarding the validity of Renard's formula for lateral shift on account of total reflection. Potential applications of the work are discussed.

ISSN:0030-3909    

DOI:10.1080/713821062

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The effects of finite exposure time (used to record astronomical speckle data) on the speckle transfer function are shown to be highly dependent on the details of the atmospheric turbulence in the optical path as well as on the deterministic wavefront aberrations of the optical system. Both Taylor turbulence, where a frozen layer or layers are convected across the aperture, and Mintzer turbulence, where the turbulence is boiling and stationary, are taken into account. Computations have been made for some typical cases of the time integrated speckle transfer function for various combinations of Taylor and Mintzer turbulence with focused and defocused optical systems.

ISSN:0030-3909    

DOI:10.1080/713821066

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Two general reciprocity relations are formulated, relating to planar sources of any state of spatial coherence and the radiation fields they generate. One of them expresses a reciprocity between the effective coherence area of the source and the effective angular spread of the radiation. The other expresses a reciprocity between the effective intensity spread across the source and the effective angular domain subtended at the source by the coherence area of the far field. Two well-known reciprocity relations associated with coherent and incoherent sources are obtained as special cases. The general reciprocity relations take a particularly simple form when the source is quasi-homogeneous.

ISSN:0030-3909    

DOI:10.1080/713821072

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor