Abstract:
A stress-optical phase modulator and modulation system, and method of use of the same is described. The stress-optical phase modulator comprises a source for providing optical beams, a photoelastic optical material, and a means for applying mechanical force to the optical material. The mechanical force so applied creates a uniform stress within the optical material and results in a change in its index of refraction. An optical beam passing through the stressed optical material undergoes a phase change and is recovered as a phase modulated optical beam. Components may be added to the stress-optical phase modulator to produce temperature-compensated and intensity-modulated optical beams.
Abstract:
A stress-optic beam scanner and system which includes a stress-optic material selected to permit the scanning of an optical beam on a target typically over a scanning angle of greater than five degrees. The system includes a piezoelectric element controlled by a microprocessor to control the mechanical stress applied to the stress-optic material.
Abstract:
An optical wave guide sensor which comprises: a broad-band, radiant energy source; an optical wave guide, such as an optical fiber, rectangular slab or thin film, having a guiding interface and an inlet an outlet, the inlet receiving the radiant energy and the wave guide deformable from one part to another of the guide; and a spectral intensity detector at the wave guide outlet to measure the change in the wavelength of the energy critically reflected from the guiding interface on deformation of the wave guide. A method of measuring the deformation of an optical wave guide and/or a parameter causing such deformation, which method comprises: measuring the change in the mode band edge critical wavelength of the first, second or higher mode of the radiant energy throughput of the wave guide as a function of the deformation of the wave guide.
Abstract:
An optical switch which comprises a photoelastic, optically transparent material whose index of refraction is changed by stress and which propagates an optical beam or beams from an inlet window to an outlet window in the material, with the inlet window adapted to receive an optical beam from an optical source and the outlet window adapted to pass an optical beam from the photoelastic material to an optical output receptor, and a receptor means of applying a stress gradient to said photoelastic material to change the index of refraction and hence, the optical path of the optical beam between a normal, unstressed optical beam path and a bent, stressed optical beam path. Optical systems are described in which the optical switch is employed to form optical lenses wherein an optical beam is focused by stress within an optical material, such as a photoelastic cylindrical rod. Optical integrated systems are also described employing the optical switch with optical devices as an optical integrated module.
Abstract:
An optical switch which comprises a photoelastic, optically transparent material whose index of refraction is changed by mechanical stress and which propagates an optical beam or beams from an inlet window to an outlet window in the material, with the inlet window adapted to receive an optical beam from an optical source and the outlet window adapted to pass an optical beam from the photoelastic material to an optical output receptor, and a means of applying a stress gradient to said photoelastic material to change the index of refraction and hence, the optical path of the optical beam between a normal, unstressed optical beam path and a bent, stressed optical beam path. Optical systems are described in which the optical switch is employed to receive an optical beam from a source and to switch a beam after passing it through the photoelastic optical material to and from an optical receptor. The disclosure also includes a method of optically switching an optical beam between normal and stressed optical beam positions by applying a predetermined mechanical force to a photoelastic optically transparent material to form a mechanical stress gradient within the optical transparent photoelastic material which provides an index of refraction gradient therein and causes the switching of the optical beam.