An apparatus for use with a pulsed laser source for forming an optical grating in a target includes an adjustable telescope having an element with a negative optical power, for generation of a diverging optical beam, so that the optical beam has adjustable divergence upon exiting the telescope while focusing of light inside the telescope is avoided. A transmission diffraction grating is disposed in the optical beam exiting the telescope, for forming an optical interference pattern on the target. Optical gratings with different grating periods may be formed by adjusting the divergence of the optical beam exiting the telescope. Lack of tight focal spots inside the telescope enables use of ultrashort pulse duration, high peak intensity laser sources.

The invention relates to a method and a device for producing at least one fiber Bragg grating in a waveguide, wherein the waveguide has at least one core having a first refractive index and the fiber Bragg grating contains a plurality of spatial regions which each occupy a partial volume of the core and have a second refractive index, wherein the spatial regions are each produced by the action of laser radiation on a partial volume of the core, wherein the laser radiation contains a plurality of pulse trains each containing a plurality of individual pulses, wherein the time interval between successive individual pulses is smaller than the time interval between successive pulse trains and the time interval between successive individual pulses is chosen between 10 ns and 100 ps or the pulse train has a duration of 50 fs to 50 ps.

An apparatus for heat deposition in additive manufacturing may include: a first optical beam source configured to generate a first optical beam; a second optical beam source configured to generate a second optical beam; and/or an optical system. The optical system may be configured to move the generated first optical beam over a target area. The optical system may be further configured to move the generated second optical beam over the target area so that a path of the second optical beam moving over the target area is dithered about a path of the first optical beam moving over the target area.

The optical system may be configured to focus the generated first optical beam at a plane of a target area. The optical system may be further configured to focus the generated second optical beam at the plane of the target area.

A laser delivery device may include a connector portion at a proximal end of the laser delivery device and an optical fiber connecting the connector portion to a distal end of the laser delivery device. The connector portion may include a capillary at least partially surrounding a proximal portion of the optical fiber, and the capillary may include dimples on at least a portion of a circumferential surface thereof.

The present invention provides a direct laser writing fabrication method and system for devices having periodic refractive index modulation structures, for example, Bragg gratings. By focusing a modulated pulsed laser beam into a transparent material substrate, a path of laser modified volumes can be formed with modified refractive index compared with the unprocessed material. Modulation of exposure conditions provides periodic or modified periodic waveguide structures such that the waveguide structures exhibit grating responses and can be used for a variety of optical applications, for example, as spectral filters, Bragg reflectors, grating couplers, grating sensors, or other devices. The method enables direct one-step fabrication and integration of periodic or modified periodic refractive-index modulation devices together with other optical waveguiding devices to enable low-cost, multifunctional one-dimensional, two-dimensional or three-dimensional optical circuit fabrication of simple and complex optical systems.

Among the various aspects of the present disclosure is the provision of systems and methods for light-based procedures that include a fiber-optic bi-directional interface device that includes a multi-core optical fiber comprising a plurality of light-guiding cores in which a first portion of the plurality of light-guiding cores each comprise a light emission modification configured to direct light propagating along the light-guiding core in a laterally outward or sideways direction relative to the propagation axis of the light-guiding core; and a second portion of the plurality of light-guiding cores each further comprises a light collection modification configured to receive light produced by a source positioned laterally outwards or sideways relative to the propagation axis of the light-guiding core.

An apparatus for use with a pulsed laser source for forming an optical grating in a target includes an adjustable telescope having an element with a negative optical power, for generation of a diverging optical beam, so that the optical beam has adjustable divergence upon exiting the telescope while focusing of light inside the telescope is avoided. A transmission diffraction grating is disposed in the optical beam exiting the telescope, for forming an optical interference pattern on the target. Optical gratings with different grating periods may be formed by adjusting the divergence of the optical beam exiting the telescope. Lack of tight focal spots inside the telescope enables use of ultrashort pulse duration, high peak intensity laser sources.

Provided are an apparatus for manufacturing a grating and a method for manufacturing a grating with which a grating having a desired attenuate wavelength characteristic can be easily manufactured. The apparatus, which forms a grating in an optical fiber as an optical waveguide, includes a laser source, beam diameter adjusting means, a scanning mirror, mirror position adjusting means, a cylindrical lens, lens position adjusting means, a phase mask, mask position adjusting means, a stage, a fixing jig, and a synchronous controller. The synchronous controller controls an adjustment of a position of the scanning mirror performed by the mirror position adjusting means and an adjustment of a position of the phase mask performed by the mask position adjusting means in a manner in which they are associated with each other.

A measuring device is provided having at least one substrate, which contains or consists of a polymer or a glass, at least one optical waveguide being written in the substrate, in which at least one Bragg grating with a predeterminable grating constant is arranged, wherein the measuring device further includes an evaluation device, which is configured to determine a deformation of the substrate and/or a force acting on the substrate from a change in the grating constant and/or a change in the refractive index of the Bragg grating.

A fiber core auto-tracing method, system, and storage medium are for fabricating fiber gratings. The method includes acquiring the image of the optical fiber to be processed on the three-dimensional translation stage in real-time, adjusting the relative position of the optical fiber and the microscope objective in the Z-axis direction, until it is recognized that two boundary lines are formed between the fiber core and the cladding in the currently collected image calculating the position of the center point of the two boundary lines on the three-dimensional translation stage and adjusting the position of the fiber to be processed on the three-dimensional translation stage accordingly until the center point coincides with the XY coordinates of the laser focus. The method can quickly and accurately find the center point of the fiber core to be processed through the image recognition technology, to ensure processing accuracy.