Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1996-01-25
1997-06-17
Henry, Jon W.
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 15, 359259, G02B 532, G02F 103
Patent
active
056402562
ABSTRACT:
A dynamic multiple-wavelength filter which selects at least one wavelength from a beam of radiation incident on a Stratified volume Holographic Optical Element (SVHOE) in accordance with the Bragg condition. The SVHOE has a number n of grating layers i and a hologram of a grating vector K.sup.i is recorded in each grating layer i. A number n-1 of buffer layers are interposed between grating layers i such that the layers SVHOE presents an alternating structure of grating and buffer layers. The filter has a diffraction efficiency control, preferably based on the ECD effect, for selectively varying the diffraction efficiency .eta. in at least one grating layer i to select from the beam of radiation a narrow bandwidth centered about Bragg wavelength .lambda..sub.B.sup.i of grating layer i.
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De Vre Raymond
Hesselink Lambertus
Board of Trustees of the Leland Stanfor Junior University
Henry Jon W.
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