Radiant energy – Electrically neutral molecular or atomic beam devices and...
Patent
1987-03-09
1989-01-10
Fields, Carolyn E.
Radiant energy
Electrically neutral molecular or atomic beam devices and...
356138, 356150, 324 713, H01S 100
Patent
active
047975520
ABSTRACT:
Related systems and methods are described for determining the angular direction of an atomic beam relative to the beam's reference axis. For a non-relativistic atomic beam, a pair of counterpropagating, equal frequency laser beams intersect the atomic beam at a known angle to the reference axis, preferably perpendicular. The atomic beam direction is inferred from the frequency difference between resonant peaks in the laser beam fluorescence as the laser frequency is scanned. For a relativistic atomic beam, a pair of laser beams intersect the atomic beam from different sides at equal predetermined angles. The atomic beam direction is determined by observing the difference between resonant absorption peaks in the transmitted laser beam intensities as either the laser beam frequencies or laser beam angles relative to the atomic beam are varied. The angles between the laser and atomic beams are preferably selected to minimize the widths of the resonant peaks. For both the relativistic and non-relativistic cases, an FM derivative spectroscopy technique is used by which the derivatives of the laser beam intensity signals are obtained, and zero crossings of the derivative signal used to precisely locate the resonant intensity peaks.
REFERENCES:
Applied Phys. Lett., vol. 39, No. 9, Nov. 1, 1981, Am. Inst. Phys. (US), J. L. Hall et al.: Optical Heterodyne Saturation Spectroscopy, pp. 680-682, see abstract; FIG. 1.
Rev. of Sci. Instr., vol. 15, No. 1, Jan. 1985, Am. Inst. Phys. (US), M. J. Verheijen et al.: Accurate (0.25 mrad), Perpendicular Alignment of a Continuous-Wave Single-Mode Dye Laser Beam and an Atomic Beam, pp. 62-65, see abstract: "Introduction", FIGS. 1, 4.
Jour. of Phys. E. Sci. Instr., vol. 15, No. 11, Nov. 1982, M. J. Verheijen et al., An Atomic-Beam Set-Up for 0.5 MHz Absolute Frequency Stabilization of a Single-Mode CW Dye Laser, pp. 1198-1206, see abstract; FIGS. 2, 3, 4.
Optics Lett., vol. 5, No. 1, Jan. 1980, Op. Soc. of Am. (US), G. C. Bjorklund: Frequency-Modulation Spectroscopy: A New Method for Measuring Weak Absorptions and Dispersions, pp. 15-17, see p. 15, left-hand col., lines 1-10, FIG. 1.
Steel Duncan G.
Turley R. Steven
Denson-Low Wanda K.
Fields Carolyn E.
Hughes Aircraft Company
Karambelas A. W.
Miller John A.
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