Gooch and Housego Plc

Cleveland Crystals, Inc.

Christopher N Pannell

Jonathan David Ward

Melvin E Pedinoff

Elliot S Wachman

Thomas E Stenger

Ramesh K Shori

Peter Edward MacKay

Stefano Valle

Robert Bronson, Jr

Guhong Zhang

Alexandre Y Fong

An acousto-optic (AO) device includes an AO crystal having a plurality of faces including a first face and a second face. An input transducer bonded to the first face (top electrode) for receiving a radio frequency (RF) signal and launching bulk acoustic waves (BAWs) configured to interact with an optical beam propagating in the AO crystal, wherein the BAWs are received at least in part by the second face after interacting with the optical beam. The second face has a roughened surface portion over an area of at least (&#x2267;) 50% of an area of the top electrode, and a root mean square (rms) surface roughness&#x2267;1 &#x3bc;m and a surface profile derivable from a Fourier transform which provides at least one a first spatial frequency peak from 1 cycle/mm to 300 cycles/mm or at least one band of spatial frequency peaks from 1 cycle/mm to 300 cycles/mm.

Acoustic absorber having a roughened surface for AO devices

An acousto-optic (AO) device includes an AO interaction crystal for receiving and propagating a light ray along an optical propagation direction (OPD). A piezoelectric transducer is on at least one surface of the AO interaction crystal for receiving an electrical signal and emitting an acoustic wave into the AO interaction crystal. An electrode is on the piezoelectric transducer for coupling the electrical signal to the piezoelectric transducer. The electrode is a patterned electrode that includes a plurality of different transverse edge positions. The plurality of different transverse edge positions span a position range of at least five percent of an average height (H) of the electrode.

Acousto-optic device with electrode having different transverse edge positions

An optical combination includes an input lens having an optical axis for receiving incoming rays, an output Petzval lens combination including spaced apart doublet lenses Land Lboth aligned along the optical axis, and an acousto-optic tunable filter (AOTF) that defines an input side and an output side for the optical combination positioned between the input lens and L. An input aperture stop is on the input side and an output beam stop is on or near L. The input lens can be an input Petzval lens combination including spaced apart doublet lenses Land L, wherein the input aperture stop is on or near L, and the input Petzval lens combination and output Petzval lens combinations are aligned back-to-back.

Optical arrangements for imaging including an acousto-optic tunable filter and at least one petzval lens combination

A thermally compensated optical device includes in an optical path an input linear polarizer for transmitting linearly polarized light from a received light beam at a design wavelength. A composite reciprocal rotator includes a first reciprocal material and at least a second reciprocal material provides a reciprocal rotation having a temperature coefficient for reciprocal rotation (tempco). At least one Faraday rotator provides a non-reciprocal rotation having a temperature coefficient for non-reciprocal rotation (tempco). An output linear polarizer transmits forward light received after transmission by the Faraday rotator. At a design temperature, the tempcoand tempcohave opposite signs and can have magnitudes that match within 50%.

Composite reciprocal rotators and thermally compensated optical isolators and circulators therefrom

A system for measuring an optical spectral response of a photoelectric DUT includes a spectrally programmable light source including a broadband light source, a dispersive element for dispersing the light, and a spatial light modulator for controlling an intensity and a spectra of the light to provide a spectrally programmable light beam. A light distributing device is coupled to receive the spectrally programmable light beam and includes a light distributing structure for distributing the spectrally programmable light beam in a known ratio to a first area and a second area. A reference detector is positioned at the first area, and the DUT is positioned at the second area. Data acquisition electronics and a processor receive simultaneously generated output signals from the DUT and the reference detector to correct for intensity variation in the spectrally programmable light beam in determining the optical spectral response of the DUT.

Corrected optical spectral responses for photoelectric devices

An acousto-optic (AO) frequency shifter includes an anisotropic crystal having an optical axis and an input face, and an acoustic transducer having electrodes affixed to the face for receiving an electrical signal and projecting an acoustic wave into the crystal. The anisotropic crystal is cut relative to the face so that the transducer is at an acoustic angle (&#x3b8;) corresponding to a predetermined angle of incidence (&#x3b8;) of an optical beam to be directed relative to the optic axis of the anisotropic crystal to substantially satisfy the parallel tangents phase matching condition.

High frequency acousto-optic frequency shifter having wide acceptance angle

A fiber intensity reducer comprises a guided system fiber including a core and an outer cladding layer, an unguided fiber intensity reducing (FIR) section including a first fiber 'end cap fiber' having a first end and a second end attached at its first end to the system fiber. A bond region is between the first end of the first fiber and the system fiber. The FIR section provides a softening point of at least 700&#xb0; C. throughout and provides a sufficient transverse dimension along its entire length so that a beam of radiation received from the system fiber expanding therein avoids an interface with the air along its entire length. In one arrangement, the FIR section includes an outer capillary on the end cap fiber, wherein the capillary and the end cap fiber provide refractive index matching.

Fiber intensity reducing devices and related systems

An acoustic transducer comprises a ferroelectric crystal having a plurality of spaced apart ferroelectric domain inverted regions and at least one non-inverted region. An electrode layer is disposed on one side of the crystal electrically contacting both the domain inverted portion and the non-inverted portion of the crystal. On a side of the crystal opposite the electrode layer, a first electrode is disposed on the domain inverted portion spaced apart from a second electrode disposed on the non-inverted portion. As a result, the acoustic transducer provides sub-transducers hooked in series having effective areas defined by the areas of their respective electrodes.

Acoustic transducers having localized ferroelectric domain inverted regions

An acousto-optic modulator includes a (100), (010) or (001) single crystal silicon acousto-optic interaction medium, and at least one transducer for emitting an acoustic wave attached to the single crystal. The transducer has a first electrode layer disposed on one side and a second electrode layer disposed on its other side. The transducer is aligned to the single crystal so that the direction of acoustic propagation in the silicon crystal is substantially along the (100), (010) or (001) direction. A q-switched laser includes a modulator according to the invention.

Silicon acousto-optic modulator

An acousto-optic (AO) device for generating a highly apodized acoustic wave field includes a piezoelectric transducer crystal for emitting an acoustic wave having a ground electrode disposed on one side of the piezoelectric crystal, and a patterned electrode layer disposed on a side of the piezoelectric crystal opposite the ground electrode. The patterned electrode layer includes a continuous region proximate to its center and a discontinuous region, a pattern in the discontinuous region including a plurality of spaced apart features electrically connected to the continuous region. An AO interaction crystal which receives the acoustic wave is attached to the ground electrode or the patterned electrode layer. A feature size of the features in the pattern are sufficiently small to provide a fine structure far field condition for the acoustic wave in the AO interaction crystal underlying the discontinuous region beginning &#x3c;5 mm measured from an interface between the piezoelectric crystal and the AO interaction crystal.

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Orlando, FL, United States of America

Christopher N Pannell