摘要:

Instabilities leading to self-pulsing, period doubling and chaos are predicted to occur in two simple systems in nonlinear optics. Namely, second-harmonic generation, inside a coherently driven optical cavity, and subharmonic generation internal to the laser cavity.

ISSN:0030-3909    

DOI:10.1080/713821254

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713821249

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713821250

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713821248

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713821256

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/716099643

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

In this paper, we demonstrate generalized reciprocity relations in the two fundamental cases of polarization for gratings of finite conductivity. These relations are the analogues of those described in a previous paper for infinitely conducting gratings. The classical expressions of energy conservation and the reciprocity theorem are then derived, as well as the linear relations (i.e. functional derivatives) between small variations of the groove profile and of the complex coefficients describing the diffracted field. Moreover, we show that the relations for finite conductivity tend towards the relations already found for infinite conductivity when the index of the material tends towards infinity. Several numerical examples are then given to make clear the usefulness of the functional derivatives.

ISSN:0030-3909    

DOI:10.1080/713821240

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Stimulated Raman radiation is considered in an optical resonator excited by an external light beam. It is assumed that the resonator is filled with a dispersive (condensed) medium for a length of the medium (along the resonator axis) close to several ‘tunnel’ lengths. A Raman-active medium is assumed to fill part of the resonator length along the resonator axis. Numerical calculations are presented of tunnel locking stimulated Raman radiation components. The shape of light pulses is calculated, and the band of locking Stokes components is derived. The feasibility of generating a light pulse of duration 3 × 10-14−4 × 10-15s in a frequency region close to the point ∂2neff/ ∂ω2= 0, located usually in the infrared spectral region (neffis the effective refractive index of the substance inside the resonator) is discussed. Also discussed is the feasibility of correcting the refractive index dispersion and generating femtosecond light pulses in the visible spectral region.

ISSN:0030-3909    

DOI:10.1080/713821251

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

It sometimes becomes necessary to modify the imaging characteristics of an optical system to achieve better performance for certain applications. The modification can be achieved by various means, and the usual practice has been to modify the amplitude and phase transmissions over different zones of the pupil of the optical system; such a modification is called apodization. The present paper reports a method of apodization in which three polarization masks are pláced at different orientations over the pupil of the optical system, which is illuminated with an elliptically polarized light beam. The performance of this apodized optical system has been investigated in terms of diffraction patterns and optical transfer functions by making use of the Jones matrix approach. It has been shown that, by suitably choosing the state of polarization of the illuminating beam and the orientation of the polarization masks, the performance of the optical system can be effectively modified. Further, with an analyser in the image plane, the diffraction pattern as well as the optical transfer function can be continuously modified for required roles.

ISSN:0030-3909    

DOI:10.1080/713821255

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A technique has been developed that permits the detection of fluctuations as small as 1 part in 105in the refractive index of graded index fibres. It consists of measuring the derivative of the profile rather than the profile itself. The procedure enables small defects on the profile to be emphasized in a smooth background.

ISSN:0030-3909    

DOI:10.1080/713821257

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor