Optical: systems and elements – Light interference – Produced by coating or lamina
Patent
1992-03-25
1994-02-22
Arnold, Bruce Y.
Optical: systems and elements
Light interference
Produced by coating or lamina
359580, 359589, 359615, 359577, 2502019, 356352, G02B 528, G01B 902, G01J 120
Patent
active
052893146
ABSTRACT:
This invention provides embodiments of etalons (10, 14, 18, 22) that eliminate or minimize a falloff of relative radiation modulation as a function of wavelength or FOV. A first embodiment employs a dispersive coating, such as a rugate (12a, 12b, 16), to correct for the phase shift across an etalon step. A second embodiment employs a dispersive coating, such as a rugate (20a, 20b, 24), that provides a stepless etalon in which the phase shifts are generated by the coating. It is shown that in a rugate the phase shift on reflection is directly related to the phase of a sinusoidal index of refraction profile within the rugate, while the frequency of the sinusoidal index of refraction profile determines the wavelength at which the phase shift occurs. By changing the phase of the sinusoidal index of refraction variation as the period of the sinusoidal index of refraction variation is changed, a phase shift of incident radiation is produced that is a function of the wavelength of the incident radiation.
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Arnold Bruce Y.
Denson-Low Wanda K.
Hughes Aircraft Company
Parsons David R.
Sales Michael W.
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