US PATENT SUBCLASS 359 / 256-- .~.~.~.~.~ With birefringent element

US PATENT SUBCLASS 359 / 256
.~.~.~.~.~ With birefringent element

Current as of: June, 1999
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359 /	HD	OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

237	DF	OPTICAL MODULATOR {3}
238	DF	.~ Light wave temporal modulation (e.g., frequency, amplitude, etc.) {3}
240	DF	.~.~ Changing bulk optical parameter {5}
245	DF	.~.~.~ Electro-optic {11}
246	DF	.~.~.~.~ Modulation of polarized light via modulating input signal {10}
256		.~.~.~.~.~ With birefringent element

DEFINITION

Classification: 359/256

With birefringent element:

(under subclass 246) Subject matter including an element having the property of dividing a ray or beam of energy into two polarized rays or beams (known as the ordinary and extraordinary rays), the directions of polarization being at right angles to each other.

(1) Note. A birefringent material which has been treated with a dichroic dye to absorb the ordinary or extraordinary ray is no longer considered to be birefrin-gent within the meaning of this definition. A birefringent element in the form of a Nicol prism, where the unwanted ray is deflected, is classified here.