A compact, wavelength-stabilized laser source is provided by utilizing a specialty gain element (i.e., formed to include a curved waveguide topology), where a separate wavelength stabilization component (for example, a fiber Bragg grating (FBG)) is used one of the mirrors for the laser cavity. That is, the FBG takes the place of the physical front facet of the gain element, and functions to define the laser cavity in the first instance, while also utilizing the grating structure to impart the desired wavelength stability to the output from the packaged laser source. As a result, the FBG is disposed within the same package used to house the gain element and provides a wavelength-stabilized laser source in a compact form.

An apparatuses relating generally to a test wafer, processing chambers, and method relating generally to monitoring or calibrating a processing chamber, are described. In one such an apparatus for a test wafer, there is a platform. An optical fiber with Fiber Bragg Grating sensors is located over the platform. A layer of material is located over the platform and over the optical fiber.

In various embodiments, wavelength beam combining laser systems incorporate optical cross-coupling mitigation systems and/or engineered partially reflective output couplers in order to reduce or substantially eliminate unwanted back-reflection of stray light.

The disclosed embodiments generally relate to extruding multiple layers of micro- to nano-polymer layers in a tubular shape. In particular, the aspects of the disclosed embodiments are directed to a method for producing a Bragg reflector comprising co-extrusion of micro- to nano-polymer layers in a tubular shape.

In various embodiments, wavelength beam combining laser systems incorporate optical cross-coupling mitigation systems and/or engineered partially reflective output couplers in order to reduce or substantially eliminate unwanted back-reflection of stray light.

A microfabricated optical probe includes: a cantilever; an optical waveguide disposed at a periphery of the cantilever and including an optical loop, the optical loop being disposed coplanar with the cantilever; a mechanical support interposed between and interconnecting the cantilever and the optical waveguide with the mechanical support such that the cantilever and optical waveguide move together; and a substrate on which the cantilever is disposed and from which the cantilever and the optical loop protrude, wherein the cantilever and the optical waveguide flex independently of the substrate.

An example system, method, and computer program product for detecting thermal runaway in a battery cell is provided. The example system includes a light source configured to emit light across a spectrum of wavelengths toward a sensing fiber having a first end and a second end. The sensing fiber may be positioned to receive the light emitted by the light source at the first end. The sensing fiber may further contain a filtering mechanism configured to reflect a portion of the spectrum of wavelengths of the light. In addition, the sensing fiber may be optically coupled to a photodiode at the second end, such that a portion of the light is reflected as the light travels through the sensing fiber. The gas may be detected based at least in part on an intensity of the light received at the photodiode indicating the onset of thermal runaway.

A hydrophone has a mandrel with a shell and a cylindrical cavity inwardly adjacent to the shell. A passage provides fluid communication between the cylindrical cavity and an exterior environment surrounding the mandrel. The hydrophone further has an optical fiber having an optical sensing section that is at least partially wound on the mandrel. The optical sensing section has an optical characteristic that varies as a function of a radial dimension of the mandrel. The mandrel has a core of solid material having a bulk modulus lower than 0.1 GPa. The cylindrical cavity is between the core and the shell.

Provided are an optical waveguide device and a laser apparatus including the same. The optical waveguide device includes a peripheral part disposed on an edge region of a substrate, an air pocket disposed on a central region of the substrate within the peripheral part, an optical waveguide comprising a core layer, which is disposed on an upper portion of the substrate within the air pocket to extend in a first direction, and an electrode on the core layer, and a plurality of hinges disposed on the air pocket to connect the optical waveguide to the peripheral part in a second direction crossing the first direction.

Optical energy delivery apparatus for ablation or embolization includes an optical fibre having a distal end which is provided a light directing element, such as a lens. The light directing element is configured to direct optical energy beyond the distal end of the optical fibre. The optical fibre includes at least one Bragg grating proximate the distal end for sensing a change in the optical fibre during its operation. The apparatus includes a control unit configured to drive an optical source and to obtain signals from a sensor unit. The controller may also drive the energy source at a sensing wavelength. The structure provides a single optical fibre supply optical energy and sense changes in optical fibre. The optical fibre may have a tapering diameter towards its distal tip for increased flexibility at its distal end.