Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1987-08-04
1989-12-19
Arnold, Bruce Y.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2504931, 350448, 372 66, 372103, G21K 106, H01S 308
Patent
active
048878855
ABSTRACT:
Arrangements are disclosed for generating a well defined traveling wave beam substantially unaffected by diffractive spreading. In different embodiments, the beam can be an electromagnetic wave, particle beam, a transverse beam, a longitudinal beam such as an acoustic beam, or any type of beam to which the Helmholtz generalized wave equation is applicable. Pursuant to the teachings herein, a beam is generated having a transverse dependence of a Bessel function, and a longitudinal dependence which is entirely in phaser form, which results in a beam having a substantial depth of field which is substantially unaffected by diffractive spreading. In first and second disclosed embodiments respectively, optical and acoustical beams are generated by placing a circular annular source of the beam in the focal plane of a focussing means, which results in the generation of a well defined beam thereby because the far field intensity pattern of an object is the Fourier transform thereof, and the Fourier transform of a Bessel function is a circular function. In a third disclosed embodiment, a microwave beam is generated by transmitting a coherent microwave beam sequentially through a phase modulator, having a periodic stop function pattern, and a spatial filter, whose transmittance is the modulus of the Bessel function, to generate a microwave beam having a transverse Bessel function profile.
More specifically, several embodiments are disclosed of an integrated optical laser cavity and an integrated microwave maser cavity for increasing the efficiency of production of the laser or maser beam. The integrated laser and maser cavities are designed to generate directly from their own gain medium a Bessel-mode diffraction-free beam.
REFERENCES:
patent: 4050036 (1977-09-01), Chambers et al.
patent: 4185254 (1980-02-01), Hall et al.
J. M. Stone, Radiation and Optics, published 1963--McGraw-Hill (New York) see p. 132 and FIGS. 7-16.
Goodman, J. W., Introduction to Fourier Optics, McGraw-Hill, N.Y., 1968, pp. 14-16.
Durnin James E.
Eberly Joseph H.
Arnold Bruce Y.
University of Rochester
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