An example system includes a laser tool configured for downhole movement. The laser tool includes an optical assembly configured to shape a laser beam for output. The laser beam may have an optical power of at least one kilowatt (1 kW). A housing contains the optical assembly. The housing is configured for movement to direct the output laser beam within a wellbore. The movement includes rotation of the laser tool around a longitudinal axis of the housing and tilting the housing relative to a longitudinal axis of the wellbore. A control system is configured to control at least one of the movement of the housing or an operation of the optical assembly to direct the output laser beam within the wellbore.

A method for providing a first and a second laser beam, which are spatially offset in relation to an input laser beam. The method includes: providing a laser source for generating the input laser beam; providing a spatial offsetting unit for providing an offset laser beam that can keep the same polarization between the input laser beam and the offset laser beam; providing a separating unit including a first module for separation by polarization in order to obtain, from the offset laser beam: the first laser beam spatially offset by transmission; and the second laser beam spatially offset by reflection, the first and second spatially offset laser beams being suitable for each describing a circle.

Beam-shaping laser optics are provided with a lens field (28) which comprises a plurality of first lenses (32) which are configured and arranged next to one another such that the plurality of first lenses (32) effect a beam shaping in a first direction (y) normal to an optical axis (x), as well as with an individual second lens (30) which is configured such that the individual second lens (30) effects a beam shaping in a second direction (z) normal to the optical axis as well (x) as well as the first direction (y). The lens field (28) and the second lens (30) are arranged in a beam path (12) one after the other along the optical axis (x). A laser system is provided with such beam optics.

Provided is a method for preparing gold nanorods having a high catalytic activity by using a femtosecond laser. The method includes: (1) preparing a gold seed solution; (2) preparing a gold nanorod solution by a seed solution growth process; (3) subjecting the gold nanorod solution to a centrifugal separation to obtain the gold nanorods, and dropping the gold nanorods on a silicon substrate; (4) building a system for preparing the gold nanorods having the high catalytic activity by using the femtosecond laser; and (5) emitting a pulse of the femtosecond laser on the silicon substrate, to allow an electric field distribution of a surface of the gold nanorod on the silicon substrate to change, to partially exfoliate atoms on the surface of the gold nanorod, thereby obtaining the gold nanorod with the high catalytic activity.

A device for marking an ophthalmic lens (3), the lens (3) being made of at least one preset material, includes a laser (1) configured to produce permanent engravings on the lens (3) and configured to emit a focused beam of pulsed ultraviolet laser radiation that includes at least one radiation wavelength ranging between 200 nm and 300 nm, has a pulse length ranging between about 0.1 ns and about 5 ns, and has an energy per pulse ranging between about 5 μJ and about 100 μJ. A laser marking process configured to produce permanent engravings on an ophthalmic lens (3) via this device is also described.

A laser crystallizing apparatus includes a first light source unit configured to emit a first input light having a linearly polarized laser beam shape. A second light source unit is configured to emit a second input light having a linearly polarized laser beam shape. A polarization optical system is configured to rotate the first input light and/or the second input light at a predetermined rotation angle. An optical system is configured to convert the first input light and the second input light, which pass through the polarization optical system, into an output light. A target substrate is seated on a stage and output light is directed onto the target substrate. A monitoring unit is configured to receive the first input light or the second input light from the polarization optical system and measure a laser beam quality thereof.

A laser processing apparatus includes: a light flux separating-and-combining device configured to polarize and separate a laser light into two polarized light fluxes having polarization orthogonal to each other and emit the two light fluxes with their optical paths matching each other toward different regions of a spatial light modulator, and configured to combine the two polarized light fluxes modulated by the spatial light modulator and emit the two light fluxes toward a condenser lens; and a controller configured to control hologram patterns presented by the spatial light modulator for respective regions of the spatial light modulator irradiated with the two polarized light fluxes such that the laser light is condensed by the condenser lens at two positions different from each other in a thickness direction inside of the wafer and the same as each other in a relative movement direction of the laser light to form modified regions.

A laser shock peening device and components thereof. The optical system of the laser peening device includes sapphire optical elements, such as a lens or a prism. A water channel is provided in a pen for the laser shock peening device that has a curved flow path to direct the water. An air conduit in the pen provides a stream of air to the surface receiving the laser shock peening treatment.

A laser ablation tool comprising a laser source which produces a beam heaving a beam path and an ablation head, the ablation head comprising a housing which on each side of the beam path is separated into a first and second portion, and at least a first Risley prism and a second Risley prism connected to the first and second portions of the housing the first and second Risley prisms being connected to a rotation mechanism, so that the two Risley prisms can be moved relative to each other and the housing so as to deflect the beam.

A head portion for irradiating the surface of a structure to be processed with laser light and a diffractive optical element housed in the head portion are provided. Laser light emitted from a light source is delivered by an optical fiber and guided into the head portion through a light input portion of the head portion. The laser light delivered by the optical fiber is collimated by a collimator into parallel light and passes through the diffractive optical element, thereby producing shaped light with a broadened radiation distribution. The shaped light is emitted through an emitting portion of the head portion and is radiated onto a processing target surface of the structure to be processed.