Chromatic focal pencil beam-generating apparatus
Patent 5610734 Issued on March 11, 1997. Estimated Expiration Date: 
February 9, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 9, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3185021 3707687 Optical system for semiconductor laser and optical information processing equipment utilizing the same Optical system with grating lens assembly for correcting wavelength aberrations Dispersion-compensated windshield hologram virtual image display Diffraction device Patent #: 5363220 InventorsApplicationNo. 386257 filed on 02/09/1995US Classes:359/16, With aberration correction359/15, Using a hologram as an optical element359/19, Lens359/615, LIGHT DISPERSION369/44.23Structure for shaping beam or causing astigmatic conditionExaminersPrimary: Dzierzynski, Paul M.Assistant: Chang, Audrey Attorney, Agent or FirmInternational ClassesG02B 005/32G02B 005/04 G11B 007/00 AbstractAn optical system is disclosed which focuses a polychromatic source to an extended focal pencil. The implementation makes use of two holographic optical elements (HOEs) fabricated and aligned to form a deliberate longitudinal color dispersion, but to alleviate lateral chromatic effects. Consequently, the HOE doublet focuses different wavelengths of the source to different locations along the optical axis. The strong intensity of the focused wavelengths dominate at each location, so that the overall beam has a near-diffraction-limited 1/e2 spot size and suffers only relatively weak background illumination. An alternative optical system using bulk lenses and several possible applications for the device are also described. | |
