Coherent | Date: 2016-01-14
A mode-stripper for an optical fiber includes a water-cooled enclosure. A portion of an optical fiber to be mode-stripped is modified in a way which allows radiation to leak from cladding of the fiber. The optical fiber extends through the enclosure from a proximal end thereof to a distal end thereof, with the modified portion of the fiber within the enclosure. The fiber is fixedly held in the enclosure at the proximal end thereof and held at the distal end of the enclosure by an elastomeric diaphragm.
Coherent | Date: 2017-01-25
Optical output beams from a vertical stack of diode-laser bars are focused by a simple focusing lens on an optical axis of the lens. The optical output beams from outlying diode-laser bars in the vertical stack are tilted with respect to the optical axis of the focusing lens such that optical output from the whole vertical stack is brought to a common focus location on the optical axis of the focusing lens.
Coherent | Date: 2017-06-28
An intra-cavity doubled OPS-laser (10) has a laser-resonator (22) including a birefringent filter (BRF) for coarse wavelength-selection, and an optically nonlinear (ONL) crystal (26) arranged for type-II frequency-doubling and fine wavelength-selection. Laser-radiation circulates in the laser-resonator (22) at one of a range of fundamental wavelengths dependent on the resonator length. The ONL crystal (26) has a transmission peak- wavelength dependent on the crystal temperature. Reflection of circulating radiation from the BRF is monitored. The reflection is at a minimum when the ONL crystal (26) transmission-peak wavelength is at the circulating radiation wavelength. The temperature of the ONL crystal (26) is selectively varied to maintain the monitored reflection at about a minimum.
Coherent | Date: 2016-11-10
The method of and device for cutting brittle materials with tailored edge shape and roughness are disclosed. The methods can include directing one or more tools to a portion of brittle material causing separation of the material into two or more portions, where the as-cut edge has a predetermined and controllable geometric shape and/or surface morphology. The one or more tools can comprise energy (e.g., a femtosecond laser beam or acoustic beam) delivered to the material without making a physical contact.
Coherent | Date: 2016-10-31
Laser-drilling apparatus includes a gas-discharge for laser emitting laser-radiation pulses, and two acousto-optic modulators (AOMs). The laser radiation pulses are characterized as having two temporal central portions between temporal leading and trailing edge portions. The AOMs are arranged to spatially separate the central temporal portions of the pulses from each other and from the leading and trailing edge portions of the pulses.
Coherent | Date: 2016-12-13
A diode-laser assembly having an electrically isolated diode-laser bar on a cooled base-element is disclosed. The diode-laser bar is electrically isolated from the base-element and electrically isolated from any coolant water, thereby eliminating the need for de-ionized water and mitigating corrosion due to galvanic action. Multiple such diode-laser assemblies are stackable, with small bar-to-bar pitch, enabling a high-current and high-brightness diode-laser stack.
Coherent | Date: 2016-07-11
In a line projector a diode-laser beam having an elliptical cross-section is projected onto a Powell lens which spreads the beam to form a line of light. Distribution of power along the line of light is adjusted by rotating the diode-laser beam with respect to the Powell lens.
Coherent | Date: 2016-01-20
In a laser line projection apparatus, six spaced-apart unpolarized laser-beams are plane-polarized with low loss by a combination of a thin-film polarizer, a reflector, and two polarization rotators. Two beams are polarized in each of three polarization-orientations. Two of the polarization-orientations are orthogonally aligned with each other in P and S orientations. The other polarization-orientation is non-orthogonally aligned in an intermediate orientation. The beams are intensity-homogenized and projected into a line of radiation. Any point on the line of radiation is formed from rays with an angular distribution of polarization-orientation from S to P through the intermediate orientation and back to S through the intermediate orientation.
Coherent | Date: 2016-12-21
Method for composing an output video signal (S_(o)) from a plurality of input video signals (Si1, Si2, Si3 ... Sim), which comprise respective input frame sequences (S_(i1)[n], S_(i2)[n], Si_(3)[n] ... S_(im)[n]) with a number of pixels for each input frame associated with an input resolution (R_(i1), R_(i2), R_(i3 ...) R_(im)), which comprises determining the spatial surface on a three-dimensional virtual space associated with each pixel; establishing a visualization point (X0,Y0,Z0) and a visualization window in the three-dimensional virtual space; calculating an associated threshold pixel density for the pixels in the visualization window; determining combinations of input frames, the projections of which are at least partially overlapping in the visualization window; and selecting the frame of each combination of frames which projected on the visualization window has a pixel density in the entire overlapping part greater than or equal to the threshold pixel density or, in the absence thereof, selecting the frame which projected on the visualization window has a greater pixel density in order to form the output frame part which is overlapping.
Coherent | Date: 2016-01-04
The present disclosure is directed to simultaneously controlling peak pulse power and pulse energy in gas-discharge lasers. In an aspect, a radio-frequency power supply that is coupled to a gas-discharge laser is turned ON to initiate delivery of a laser pulse. The radio-frequency power supply is modulated ON/OFF to maintain the amplitude of the laser pulse at about a desired or prescribed value. Further, the radio-frequency power supply is turned OFF to terminate delivery of the laser pulse when the accumulated energy reaches reached a predefined energy threshold value.