Abstract: A glueless optical device includes a housing having a first optical portal and a second optical portal opposite the first optical portal. A first optical component is within the housing adjacent to the first optical portal, and a second optical component is within the housing adjacent to the second optical portal. A central optical component is positioned within the housing between the first optical component and the second optical component. A first holder is configured to mount the first optical component to the housing via a first plate spring, and a second holder is configured to mount the second optical component to the housing via a second plate spring. A construct having a coil spring at least partially wrapped around a cylindrical crystal is configured to pass through a bore hole in the central optical component and mount the central optical component between the first holder and the second holder.

Abstract: A wavelength converter that converts signal light and pump light into a light containing a new wavelength component using a nonlinear optical fiber, has a PBS for splitting incident light into a first polarized wave and a second polarized wave, a first polarization controller provided between the PBS and a first end of the nonlinear optical fiber, and a second polarization controller provided between the PBS and a second end of the nonlinear optical fiber, wherein in an optical loop connecting the PBS, the first polarization controller, the nonlinear optical fiber and the second polarization controller, the first polarized wave and a first component of the pump light travel through the nonlinear optical fiber in a first direction, and the second polarized wave and a second component of the pump light travel through the nonlinear optical fiber in a second direction opposite to the first direction.

Abstract: Apparatus and methods are described for a side looking NMR tool for downhole geophysical analysis wherein a unique static field shape is provided by two magnets magnetized in two different directions. The tilted configuration of magnets and optimized value of the tilt angle provide, among other advantages, an elevation of the Signal-to-Noise-Ratio (SNR), an enriched content of the 1H NMR signal from rock formations by providing a wider span of gradients including higher gradients, a diminished level of undesired sodium 23Na signal, less tool energy consumption and a wider NMR beam.

Abstract: An optical device includes a photonically controlled Josephson Junction and a Faraday rotator cell magnetized by the Josephson Junction.

Abstract: An optical tracking system for use in a free space optical communication system is described. The system includes a birefringent lens that is positioned to receive incident light and to produce light with a first and a second polarization. The system also includes a focusing lens positioned to receive the light with the first and the second polarizations and to direct the light with the first polarization to a first focal location along the optical axis and the light with the second polarization to a second focal location along the optical axis. A quadrature detector that is positioned between the first focal location and the second focal location receives the light with both the first and the second polarizations, and produces an output that is indicative of an alignment of the optical system.

Abstract: Methods, systems, and apparatus for optical communications. One of the apparatuses comprises a birefringent crystal configured to separate an incoming light beam input at a first port into component light beams having orthogonal polarization directions and directing the component light beams on respective paths to exit locations on the birefringent crystal; and a Faraday rotator positioned between the birefringent crystal and a beam folding optic assembly, wherein the Faraday rotator is positioned such that light beams exiting the birefringent crystal along a first path from a first exit location pass through the Faraday rotator before being incident on the beam folding optic assembly and that light beams exiting the birefringent crystal along a second path from a second exit location pass directly to the beam folding optic assembly without being incident on the Faraday rotator.

Abstract: A Faraday rotator may include a magnetic field forming section configured to form a magnetic field at a predetermined magnetic flux density in a predetermined region, a Faraday element disposed in the predetermined region, and a first heat exhaust member, disposed on the side of one primary plane of the Faraday element, configured to form an optical contact surface with the Faraday element and configured to allow light at a predetermined wavelength to pass.

Abstract: An optical isolator including a Faraday rotator that has a high Faraday effect and a high transmission factor in a wavelength used is provided. An optical isolator comprises at least: a Faraday rotator; a polarizer arranged on a light incidence side of the Faraday rotator; and an analyzer arranged on a light exit side of the Faraday rotator, wherein the Faraday rotator consists of an oxide that contains an ytterbium oxide (Yb2O3) with a mass ratio of 30% or more.

Abstract: It is an object of the present invention to provide an optical waveform shaping device of high resolution. The above-mentioned problem is solved by an optical waveform shaping device (10) comprising a branching filter (11) for dividing the light beam from a light source into light beams of each frequency, a condensing part (12) for condensing a plurality of light beams divided by the branching filter (11), a polarization separation means (13) for adjusting the polarizing planes of the light beams having passed through the condensing part (12), and a spatial light modulator (14) having a phase modulation part and an intensity modulation part where the light beams having passed through the polarizing plate (13) are incident.

Abstract: An optical transmitter includes an optical isolator that includes a Faraday rotator transmitting light output from a light source, and has a first state in which the light is transmitted through the optical isolator when a first magnetic field is applied to the Faraday rotator, and a second state in which the amount of the light transmitted through the optical isolator is less than that in the first state when a second magnetic field different from the first magnetic field is applied to the Faraday rotator; a junction to which an optical transmission medium into which the light output from the optical isolator is input is connected; a magnetic-field generator that selectively applies the first magnetic field or the second magnetic field to the Faraday rotator; and a switching unit that switches the magnetic-field generator to the second state when the optical transmission medium is not connected to the junction.

Abstract: An axially symmetric permanent magnet structure with tunable longitudinal fields is described wherein selected radial magnet sectors in a truncated Halbach array configuration are tiltable. The tunable magnet structure is particularly useful in Faraday devices, such as Faraday rotators, Faraday mirrors, optical circulators and optical isolators.

Abstract: A Faraday rotator of an opto-isolator in a laser processing apparatus includes a crystal cylinder that causes the Faraday effect, an enclosing tube, cooling tubes, and a magnet. The enclosing tube encases the crystal cylinder. The cooling tubes are sandwiched between the crystal cylinder and the enclosing tube at both ends of the crystal cylinder. The cooling tubes have passages through which a coolant flows. The coolant circulates through a space between the crystal cylinder and the enclosing tube, and the passages, thereby cooling the crystal cylinder.

Abstract: Techniques and devices for depolarizing light and producing a variable differential group delays in optical signals. In one implementation, an input optical beam is split into first and second beams with orthogonal polarizations. One or two optical reflectors are then used to cause the first and second optical beams to undergo different optical path lengths before they are recombined into a single output beam. An adjustment mechanism may used implemented to adjust the difference in the optical path lengths of the first and second beams to produce a variable DGD. When the depolarization of light is desired, the difference in the optical path lengths of the first and second beams is set to be greater than the coherence length of the input optical beam.

Abstract: A dual pulsed light generation apparatus including a polarization beam splitter (PBS), a first polarization reflector, and a second polarization reflector is provided. The PBS has a first plane, a second plane, and a dividing interface located between the first plane and the second plane. The PBS is located in the transmission path of an incident pulsed light and used for dividing the incident pulsed light into a first polarization pulsed light reflected by the dividing interface and a second polarization pulsed light passing through the dividing interface. The first polarization reflector is disposed opposite to the first plane and transforms the first polarization pulsed light into a third polarization pulsed light passing through the dividing interface. The first polarization reflector is disposed opposite to the second plane.