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5751425 |
Apparatus and method for detecting rotation rate, Faraday bias and cavity length in a ring laser gyroscope
A ring laser gyroscope having an alternating Faraday bias includes mode combining apparatus arranged to cause interference between the modes that propagate within the cavity. Signal separating...
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5463652 |
Combining optics for ring laser gyro
The apparatus of this invention uses a rectangular-parallelepiped prism to extract portions of the counterpropagating beams from a ring laser of a gyro. Such prism is easier to build than prisms...
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5430543 |
Ring laser gyro detector lens system
A ring laser gyroscope detector lens system for mounting on a ring laser gyroscope body having a resonant cavity. The ring laser gyroscope body has CW and CCW counterpropagating light beams...
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5420683 |
Multioscillator ring laser gyro beam combining optics
Multioscillator beam-combining optics having prisms for processing both clockwise and anticlockwise elliptically polarized beams having both helicities transmitted through a partly transmissive...
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5404007 |
Radiation resistant RLG detector systems
A ring laser gyro, RLG, is a highly accurate optical rotation sensor using counter propagating light beams to sense rotation as a rate integrating gyro. There is however, the problem of RLG...
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5404223 |
Readout beamsplitting/combining apparatus for ring laser gyro
A readout apparatus for both partial beams (101,102) of a ring laser gyro (100) is designed strictly symmetrical so that each partial beam until its detection on a photodetector (114-117) travels...
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5386289 |
Case mounted readout for providing a ring laser gyro with low backscatter
Low rate performance is vastly improved by reducing undesired backscatter sources. Backscatter is eliminated by repositioning some of the backscattered sources to direct any reflected backscatter...
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5384636 |
External scatter removal system
Disclosed herein is an External Scatter Removal System for Ring Laser Gyroscopes (such as a Split Gain Multioscillator) comprising a prism mounted on an optoisolator, wherein light transmitted out...
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5377010 |
Air path beam combining optics for a ring laser
An output beam combining apparatus for recombining diverging output beams from a ring laser. One preferred embodiment of the present invention includes a first planar mirror mounted to an exterior...
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5373360 |
Method and apparatus for reducing rotational bias in a ring laser
Method and apparatus for reducing rotational bias error in a ring laser. The method includes the steps of varying a portion of an optical path for laser beams that emerge from a ring laser cavity...
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5371592 |
Laser intensity monitoring apparatus with metallic thin film mask
The present invention relates to a laser intensity monitor. Specifically the laser intensity monitor uses a black chrome metallic, non-light transmissive mask deposited on an optically transparent...
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5359414 |
Ring laser gyroscope fringe detector apparatus with radiation photocurrent compensation
A ring laser gyroscope radiation-resistant detector lens system for mounting on a ring laser gyroscope body having a resonant cavity. The ring laser gyroscope body has CW and CCW counterpropagating...
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5000571 |
Method of fabricating a readout apparatus for a ring laser gyroscope
A gyro readout mask is made from the actual readout interference fringe pattern. A photographic image of the readout interference fringe pattern is made, and the resulting photographic image, or a...
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4973162 |
Ring laser gyroscope readout
A triangular ring laser gyroscope which has three readout subassemblies with a circuit for using the best two out of the three readings. The gyroscope includes a block having corners with three...
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4890923 |
Apparatus for superposing two light beams
Apparatus, suitable for a laser ring resonator, for superposing of two light beams that interfere at an angle of divergence and form a pattern of interference fringes at an observation location....
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4886364 |
Ring laser gyroscope beam combiner for separating and combining circulating laser beams for power and fringe pattern detections
In a monolithic gyro assembly having three ring laser gyroscopes each measuring the inertial rotation of an axis, a polyhedron having three facets is used as the beam combiner for the gyroscope. On...
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4877311 |
Laser power monitoring optics for a ring laser gyroscope
Instead of using two power monitoring photodiodes and associated summing circuitries for adding the power of the laser beams circulating in the cavity of a ring laser gyro, the present invention...
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4871253 |
Readout apparatus for a laser angular rate sensor
Two electrically isolated photodetectors are responsive to an interference pattern output of a ring laser angular rate sensor. The two photodetectors are constructed to have a periodic pattern of...
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4865452 |
Beam combiner assembly for ring laser gyroscope
A beam combiner assembly for a ring laser gyroscope is fabricated by positioning two diffraction gratings, mounted onto respective light transmissive substrates, with respect to the output mirror...
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4863271 |
Optical combiner for a ring laser gyro
The apparatus of this invention is a composite combining prism for combining the beams of a ring laser gyro. It uses a composite prism whose trunk is fabricated of two substantially identical...
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4818109 |
Fiber optical combiner particularly for a ring laser gyro
Apparatus for producing a three phase signal from two or three optical beams at different optical frequencies, such signal having a frequency equal to the difference frequency or frequencies...
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4783170 |
Readout for a ring laser gyro using a platinum beam splitter
A symmetrical prismatic readout apparatus includes a pair of substantially identical prism elements positioned in back-to-back relationship with respect to each other to provide a symmetrical...
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4712917 |
Readout for a ring laser gyro
A symmetrical prismatic readout apparatus includes a pair of substantially identical prism elements positioned in back-to-back relationship with respect to each other to provide a symmetrical...
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4676643 |
Ring laser gyro readout assembly simplification with adjustment capability
A readout apparatus responsive to clockwise and counter-clockwise counter-rotating light beams that have a frequency difference relatable to the rate of rotation of a ring laser gyroscope, the...
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4677641 |
Simplified readout optics for a ring laser apparatus
An optical readout arrangement features a unitary optical element which serves both as a substrate for the corner mirror of the ring laser gyro and as a prismatic beam folding and combining...
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4582429 |
Readout for a ring laser
Disclosed is a readout apparatus for obtaining single beam and double beam signals for a ring laser angular rate sensor.
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4536087 |
Dither compensator for ring laser gyroscope
Dither compensation in a ring laser gyroscope is effectuated by one or more retroreflective prisms or by one or more pairs of cofunctioning transparent wedges mounted to the gyroscope casing in a...
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4514087 |
Ring laser gyroscope readout for partially overlapping beams
A ring laser gyroscope includes a laser ring having at least three reflective surfaces. At least one of the reflective surfaces is partially reflecting and partially transmissive for removing a...
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4514832 |
Single mirror ring laser gyro readout without combining optics
A detector structure for use in a ring laser gyroscope includes a partially reflective surface on an inside face of a carrying substrate for passing a portion of each of the counter rotating...
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4449824 |
Laser gyro output optics structure
A four frequency laser gyroscope system having a rugged and compact output structure for producing output signals representing the frequency differences between counter-circulating wave pairs...
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4444502 |
Ring laser gyroscope with fiber optic beam combiner
An electromechanically dithered ring laser gyroscope includes a beam combiner utilizing optical fibers instead of conventional optics. This permits a beam measuring photodetector and associated...
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4411527 |
Ring laser gyroscope with compensation
A ring laser gyroscope having a triangular block configuration is dithered about its center of gravity. An optical wedge attached to the output mirror allows the center of support to include the...
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4399543 |
Linear output coupler for a high power optical ring resonator
An output coupler for a high power ring laser employs a wedge mirror and a corresponding inverted wedge mirror to deflect a portion of both forward and reverse traveling waves and to combine the...
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4219276 |
Detection system for ring laser gyro
A detection system for a ring laser gyro includes an array of photo-diodes mounted in the path of the laser beams, preferably on one of the laser mirrors. The outputs of the photo-diodes are...
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4190364 |
Ring laser gyroscope
The invention is concerned with angular rate sensors, and particularly with ring laser gyroscopes which includes means for compensating for the effects of temperature gradients and residual...
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4167336 |
Ring laser gyroscope having wedge desensitizing optical means
A ring laser gyroscope having a triangular block configuration and means to dither the block about its line of symmetry. The triangular block is configured to be symmetrical about its axis of...
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4152072 |
Photosensitive diodes for simplified optical heterodyning and cavity length control
Three electrically isolated photosensitive diodes on a common substrate are located directly behind a multilayer dielectric coated mirror that is one of the reflective elements of a ring laser. A...
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3642375 |
OPTICAL COMBINER
Apparatus for determining the magnitude and sense of the frequency difference between two identically sensed circularly polarized light beams comprising a beam splitter and respective pairs of...
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3370253 |
Integral mirror-photodetector structure
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3345909 |
Direction sensor for laser gyro
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3332314 |
Optical interferometric navigational instrument
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