Abstract: A terminated hollow-core optical fiber includes a capillary, a hollow-core optical fiber including a structured cladding, and an endcap. A first end of the hollow-core optical fiber terminates inside the capillary a non-zero distance away from a first end face of the capillary. The hollow-core optical fiber is adhered to the capillary at a second end face of the capillary where the hollow-core optical fiber extends out of the capillary. The endcap is fused to the first end face of the capillary. The endcap has a larger diameter than the first end of the hollow-core optical fiber. This termination scheme does not require fusing the hollow-core fiber itself to the endcap or any other part. Therefore, this termination scheme is applicable to hollow-core fibers with a structured cladding that cannot tolerate the temperatures associated with fusing the hollow-core fiber to another part.

Abstract: A terminated hollow-core optical fiber includes a capillary, a hollow-core optical fiber including a structured cladding, and an endcap. A first end of the hollow-core optical fiber terminates inside the capillary a non-zero distance away from a first end face of the capillary. The hollow-core optical fiber is adhered to the capillary at a second end face of the capillary where the hollow-core optical fiber extends out of the capillary. The endcap is fused to the first end face of the capillary. The endcap has a larger diameter than the first end of the hollow-core optical fiber. This termination scheme does not require fusing the hollow-core fiber itself to the endcap or any other part. Therefore, this termination scheme is applicable to hollow-core fibers with a structured cladding that cannot tolerate the temperatures associated with fusing the hollow-core fiber to another part.

Abstract: A fiber-optic cable includes an optical fiber that transports a forward-propagating laser beam. The optical fiber includes a core, a cladding, and an output end-face emitting the forward-propagating beam. The fiber-optic cable also includes a mode-stripper, along a segment of the optical fiber, that couples out backward-propagating radiation that has been coupled into the cladding at the output end-face. The fiber-optic cable further includes a waveguide having a waveguide body with a bore containing at least part of the segment of the optical fiber. The bore is defined by an inward-facing surface that guides at least a fraction of the backward-propagating radiation, coupled out of the cladding by the mode-stripper, toward a rear opening of the bore farthest from the output end-face. Additionally, the fiber-optic cable includes one or more sensors or fiber ports that receive portions of the backward-propagating radiation emerging from the rear opening.

Abstract: A terminated hollow-core optical fiber includes a capillary, a hollow-core optical fiber including a structured cladding, and an endcap. A first end of the hollow-core optical fiber terminates inside the capillary a non-zero distance away from a first end face of the capillary. The hollow-core optical fiber is adhered to the capillary at a second end face of the capillary where the hollow-core optical fiber extends out of the capillary. The endcap is fused to the first end face of the capillary. The endcap has a larger diameter than the first end of the hollow-core optical fiber. This termination scheme does not require fusing the hollow-core fiber itself to the endcap or any other part. Therefore, this termination scheme is applicable to hollow-core fibers with a structured cladding that cannot tolerate the temperatures associated with fusing the hollow-core fiber to another part.

Abstract: The invention relates to an optical assembly (100) comprising a first optical fiber (101) propagating coherent light in a predetermined direction (P) into an input end (110) of the optical assembly (100), said optical fiber having a core and a cladding; a heat sink (111) surrounding the optical fiber (101) at the input end (110); and a lens (120) arranged after the heat sink (111) in the propagating direction (P). The optical assembly (100) further comprises a filter (130) arranged after the lens (120), wherein the filter (130) has a reflective surface (131) arranged to transmit light having one or more desired wavelengths and to reflect one or more undesired wavelengths back through the lens (120). The invention further relates to a method for separating desired and undesired wavelengths.

Abstract: The invention relates to an optical assembly (100) comprising a first optical fiber (101) propagating coherent light in a predetermined direction (P) into an input end (110) of the optical assembly (100), said optical fiber having a core and a cladding; a heat sink (111) surrounding the optical fiber (101) at the input end (110); and a lens (120) arranged after the heat sink (111) in the propagating direction (P). The optical assembly (100) further comprises a filter (130) arranged after the lens (120), wherein the filter (130) has a reflective surface (131) arranged to transmit light having one or more desired wavelengths and to reflect one or more undesired wavelengths back through the lens (120). The invention further relates to a method for separating desired and undesired wavelengths.

Abstract: An optoelectronic assembly connectorizing light through an optical fiber. A housing includes an axially extending cavity. A transparent window is located at a first end of the cavity. A termination part is located at a second end of the cavity. The cavity forms a cooling chamber being fed by a flowing coolant surrounding an envelope surface of the optical fiber. The optical fiber is in optical contact with the window and extends out of the assembly through the termination part. The optical fiber is fixed in the termination part with a guiding glue.

Abstract: An optoelectronic component for receiving light. A housing including an axially extending cavity is arranged to receive an incoming beam. At least one adjustable arrangement includes at least one lens and a first adjustment module configured to adjust a focal point of the lens relative to an end surface of an optical fiber connectable to the housing. A first body is arranged to influence a position of the lens. A second body contacting the first body is journalled in the housing. The first adjustment module is arranged to act on the first body to rotate the first body spherically around a distant point and to alter the position of the lens, in order to locate a focal point of the lens on an end surface of the optical fiber.

Abstract: The present invention relates to an apparatus for monitoring the process performance of a laser system with a high-power optical fiber cable (3), specifically an optical fiber cable made for transmitting power levels up to and exceeding 20 kW. Generally the fiber cable has an entrance end (1) for an incident beam-light and an exit end (2) where the beam-light is leaving the optical fiber, and wherein at least one of the ends is provided with a connector device (4,5) having sensor means (14) for monitoring the optical fiber cable status. According to the invention the sensor means (14) are located inside the connector device (4,5) and arranged for monitoring and controlling a laser application process during action as well as detection of conditions within the connector device, such as scattered light, temperatures or the like.

Abstract: An optical fiber connector for transmitting high optical power, specifically power exceeding 1 kW. The connector includes an optical fiber having one of its ends in direct optical contact with a body made of a transparent material. The body in connection with the optical fiber end has a surface with an area exceeding the contact surface area of the optical fiber. The surface of the transparent body has a substantially conical design in order to provide an efficient flowing geometry around the contact end of the fiber, to increase the surface area for incident power loss radiation and deviate such radiation towards the optical axis of the connector.

Abstract: The present invention relates to an apparatus for monitoring the process performance of a laser system with a high-power optical fiber cable (3), specifically an optical fiber cable made for transmitting power levels up to and exceeding 20 kW. Generally the fiber cable has an entrance end (1) for an incident beam-light and an exit end (2) where the beam-light is leaving the optical fiber, and wherein at least one of the ends is provided with a connector device (4,5) having sensor means (14) for monitoring the optical fiber cable status. According to the invention the sensor means (14) are located inside the connector device (4,5) and arranged for monitoring and controlling a laser application process during action as well as detection of conditions within the connector device, such as scattered light, temperatures or the like.

Abstract: A device for cooling optical components based on optical fibers for transmitting high optical power. The device includes one or more cavities with a flowing coolant to take care of optical power loss. The device includes a transmitting construction material having a low heat expansion coefficient arranged in direct connection with the optical components and arranged to transmit power loss radiation into the cavity which is flushed with the flowing coolant. The transmitting construction material is made as a transparent tube and surrounded by a tubular casing of a non-transparent material having a good absorption capacity so that the cavity is formed between the two materials.

Abstract: A device for cooling optical components based on optical fibers for transmitting high optical power. The device includes one or more cavities with a flowing coolant to take care of optical power loss. The device includes a transmitting construction material having a low heat expansion coefficient arranged in direct connection with the optical components and arranged to transmit power loss radiation into the cavity which is flushed with the flowing coolant. The transmitting construction material is made as a transparent tube and surrounded by a tubular casing of a non-transparent material having a good absorption capacity so that the cavity is formed between the two materials.

Abstract: An optical fiber contact for transmitting moderate-magnitude optical power. The fiber contact includes an optical fiber having an inner core and a surrounding cladding for transmitting the radiation in the core. Additional surrounding layers including so-called buffer and jackets mechanically stabilize the optical fiber. The forward part of the optical fiber contact is surrounded by a transparent tubular member. The tubular member extends a certain length along the outer cylindrical surface of the cladding. There is no heating by power loss radiation, as the power loss radiation is leaving the contact as optical radiation. To disperse radiation propagating within the cladding, the cladding includes a roughening or additional layers of a transparent material. In case of additional layers of transparent material then the outermost layer should be roughened.

Abstract: An optical fiber connector for transmitting high optical power, specifically power exceeding 1 kW. The connector includes an optical fiber having one of its ends in direct optical contact with a body made of a transparent material. The body in connection with the optical fiber end has a surface with an area exceeding the contact surface area of the optical fiber. The surface of the transparent body has a substantially conical design in order to provide an efficient flowing geometry around the contact end of the fiber, to increase the surface area for incident power loss radiation and deviate such radiation towards the optical axis of the connector.

Abstract: The present invention relates to a method and a device for detecting damages in an optical fibre (1,2) made for transmitting high optical power, specifically power exceeding 1 kW, and where the optical fibre (1,2) has an entrance end (7) for incident optical radiation (4) and an exit end where the optical radiation is leaving the fibre. According to the invention substantially radially spread radiation in connection with the entrance and/or exit parts of the fibre is detected, and if this radiation exceeds a certain level this is used as an indication of a damage in the entrance and/or exit zone of the fibre.

Abstract: A method and apparatus for measuring the power loss in a fiber optical connector of the type which includes an optical fiber for transmitting high optical power, specifically power exceeding 1 kW. Incident radiation falling outside the fiber core is absorbed at least partially in a flowing coolant. The connector includes thermo-elements for measuring a temperature difference between the ingoing and outgoing coolant as a measure of the generated power loss. The flow speed may be adapted to different power losses.