6 results about "Nanosecond laser pulse" patented technology

The application discloses a disk medium high-energy ultra-short pulse laser regenerative amplifier based on CPA technology, comprising: a femtosecond laser seed light source for providing femtosecond seed light; a chirped Bragg fiber grating for expanding the femtosecond seed light into nanosecond laser pulses; an optical coupling input and output device for coupling input of the nanosecond laser pulses and coupling output of the nanosecond laser pulses after amplification processing; a regenerative amplification laser cavity for regenerative amplification processing of the coupled-in nanosecond laser pulses; the optical coupling input and output device comprises a fiber coupling collimation module, an optical isolator, a first 1 / 2 wave plate and a thin film polarizer; the regenerative amplification laser cavity comprises a Pockels cell, a second 1 / 2 wave plate, a first reflection module, a second reflection module, a first telescope module, a second telescope module, a first disk gain medium, a second disk gain medium and a third reflection module; the regenerative amplifier can realize high-repetition-frequency and high-pulse-energy laser pulse output.

The invention belongs to the technical field of terahertz polarization devices, and particularly discloses a laser direct writing reconfigurable terahertz polarization device and a preparation method thereof. The preparation method comprises the following steps: sputtering a phase change material layer on one surface or two opposite surfaces of a substrate by adopting a magnetron sputtering process; and inducing a partial region of the phase-change material in the phase-change material layer to be converted from an amorphous state to a crystalline state by scanning nanosecond laser pulses at a high speed, and controlling a laser track through a galvanometer scanning system to print a grating structure so as to obtain the terahertz polarization device. The preparation method has the characteristics of no photoetching and high preparation efficiency, and the extinction ratio of the prepared terahertz polarization device is high.

The application provides a vacuum electroplating process and an electroplating device using nano silver ions to improve efficiency, which comprises the following steps: placing silver pieces into water, obtaining nano silver glue by irradiating with nanosecond laser pulses; adding a surfactant to the nano silver glue and obtaining highly dispersed nano silver particles by laser pulses; introducing argon gas with a certain pressure into a vacuum chamber, performing laser treatment on the surface of a substrate by pulse laser; adding the nano silver particles into the vacuum chamber, performing vacuum magnetron sputtering on the substrate, and projecting the focused laser pulses onto the surface of the required electroplating position of the substrate, so as to obtain an electroplated part; spraying a protective film on the electroplated surface of the electroplated part; performing laser treatment on the surface of the substrate by using pulse laser, then performing vacuum magnetron sputtering on the substrate, and projecting the focused laser pulses onto the surface of the required electroplating position of the substrate, so as to accurately lock the electroplating position and effectively improve the electroplating efficiency.

This invention relates to a laser welding method based on variable pulse width dual pulses and a multi-scale observation system, belonging to the field of femtosecond laser welding application technology. The invention splits a femtosecond laser pulse into two femtosecond laser pulses. One of these pulses is spread into a picosecond-nanosecond pulse with adjustable pulse width using a pulse stretcher. The delay between the two pulses can be controlled using a delay translation stage. This allows the interface to be welded to first be irradiated by the picosecond-nanosecond laser pulse to generate a suitable thermal effect, followed by irradiation by the femtosecond laser pulse to form a "cold weld." By controlling the thermal phase transition process, welding efficiency and performance are improved. Combined with a multi-scale observation system, the welding process can be observed in real time from the femtosecond to the second scale. This invention has the advantages of high efficiency and simplicity, enabling high-quality, high-strength, and high-efficiency welding of difficult-to-machine dissimilar materials.

A laser device is disclosed that is configured to selectively operate in two different modes of operation: in a first mode of operation, the laser device is configured to output femtosecond laser pulses; and in a second mode of operation, the laser device is configured to output nanosecond laser pulses.

A laser device includes a laser module for generating a laser beam of sub-nanosecond laser pulses with a laser source, and arranged downstream of the laser module in a beam path of the laser beam, a deviating instrument for variable deviation of the laser beam in two spatial directions. The laser device further includes a focusing instrument for variable displacement of a focal point of the laser beam in a third spatial direction that corresponds to a propagation direction of the laser pulses.