| holograph | A document, as a letter, deed, or will, wholly in the handwriting of the person from whom it proceeds and whose act it purports to be. Origin: L.holographus entirely autograph, Gr. "olografos; "olos whole + grafein to write: cf. F. Holographe, olographe. Source: Websters Dictionary (01 Mar 1998) |
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| holographic | Of the nature of a holograph; pertaining to holographs. Source: Websters Dictionary (01 Mar 1998) |
| holographic microscopy | <technique> A mode of light microscopy in which a highly coherent, laser beam is split into a reference and main beam, with the reference beam (usually travelling outside of the microscope) being made to interfere with the main beam that has passed through the specimen. The interference of the two mutually coherent beams forms a hologram. The depth of field gained by viewing the hologram is essentially infinitely great, and the contrast mode or observation can be switched to dark field, phase contrast, interference contrast, etc., after the hologram has been formed by the microscope in bright field. (05 Aug 1998) |
| holography | <physics> A technique for recording and later reconstructing the amplitude and phase distribution of a wave disturbance. (09 Oct 1997) |