A firearm having a laser induced friction surface. A method for forming the laser induced friction surface on the firearm may includes the steps of disposing the laser machine adjacent to a component of the firearm, adjusting the laser machine, then applying the laser beam of the laser machine onto a component surface.

A direct write laser based machining process wherein a laser beam is controlled to machine a glass material in an interlaced raster scan pattern. An embodiment of machining a glass substrate to form an optical element is described. An ultrashort pulsed laser is used for machining and smoothing fused silica, followed by CO.sub.2 laser polishing. High speed and high quality machining is possible using this approach, which allows efficient use of high laser repetition rates.

Provided is a laser mark printing method and a method of producing a laser-marked silicon wafer that can reduce the machining strain left around dots constituting a laser mark. In a method of printing a laser mark having a plurality of dots on a silicon wafer, the plurality of dots is formed using laser light having a wavelength in the ultraviolet region.

Various aspects of the present disclosure are directed toward utilizing pulsed laser light to melt and displace material along a surface. As may be consistent with one or more embodiments, material at respective regions of a surface is melted and displaced using pulsed laser light. The melting and displacement at different ones of the regions is carried out to facilitate different displacement at each region. Such an approach may be used by varying characteristics, such as fluence, of the pulsed laser light at each region. In this contexts, surfaces can be smoothed, and structures can be formed on the surface.

A sheet-metal workpiece is prepared for coating by first trimming or punching a sheet-metal workpiece to give it an edge with sharp corners. Then the edge is rounded such that the corners are no longer sharp and merge into adjacent faces of the workpiece. Finally, and coating at least the rounded edge of the workpiece with an anticorrosive agent with a matrix of organic binders or with predominantly organic components.

A managed article that allows an engraved code to be detected. The engraved code including a plurality of dot dented portions is formed on a managed article. Each of the dot dented portions has a quadrilateral pyramid shape with a coating layer formed on a prior stage dented portion (15) having a quadrilateral pyramid shape. Corner dented portions (25) dented at acute angles outward along a diagonal direction are formed at four corner positions of an opening peripheral edge portion (22) of the prior stage dented portion. This configuration leads to detection of the dot dented portion as a quadrilateral dot. In addition, the present configuration allows a coating material to be introduced into the corner dented portions at the time of the coating, thereby contributing to preventing or reducing inward projection of the coating layer at the corner positions of the dot dented portion.

Provided is a managed article that allows an engraved code to be excellently detected. An engraved code 11including a plurality of dot dented portions 15 is forced: on a managed article 10. The engraved code 11 includes. An opening peripheral edge portion 22 of each of the dot dented portions 15 has a quadrilateral shape. This configuration leads to detection of the dot dented portion as a quadrilateral dot. Therefore, this configuration allows the engraved code to be excellently detected.

A system uses a femtosecond laser beam to polish a surface of an optical element to optical smoothness. The system includes a fixture, a laser system, and a controller. The fixture holds the optical element. The laser system generates the femtosecond laser beam. The femtosecond laser beam includes converging laser pulses with a pulse duration less than 900 femtoseconds. The controller controls relative positioning of the surface of the optical element and the femtosecond laser beam so that a waist of the femtosecond laser beam is outside the optical element and 0.5-2.0 Rayleigh ranges away from the surface of the optical element. Also, an intensity of the femtosecond laser beam at the surface of the optical element is sufficient to ablate the surface.

A method includes applying a laser directly to a surface of a glass substrate to smooth the surface of the glass substrate. The method can further include applying a reflective coating directly to the smoothed surface of the glass substrate. An apparatus can include a titania-silica glass substrate having a laser polished surface that is not a separate layer from the glass substrate. The apparatus can include a reflective surface applied directly to the laser polished surface.

A method is described or processing diamonds, either natural or artificially produced, by using a laser beam with minimal power output. The laser wavelength is fitted to the peak absorption wavelength of diamond, such as a helium-silver laser with a wavelength of 224 nm.