40 results about "Picosecond laser pulse" patented technology

A method of making an at least one hole in an optically transparent body comprises the following steps: (i) providing an ultrashort pulse laser for producing a laser output with a wavelength λ, the laser output having a subpicosecond laser pulse duration; (ii) providing a laser output focusing lens for focusing the laser output, the focusing lens having a numerical aperture NA; (iii) providing an optically transparent body, the optically transparent body having a transparency at λ of at least 90% / cm; (iv) providing a liquid filled container situated proximate to the optically transparent body, such that the optically transparent body is in direct contact with the liquid; and (v) directing the laser output through the focusing lens to produce a focused laser output with a subpicosecond laser pulse duration proximate the optically transparent body, wherein the focused laser output traces at least one hole track pattern through the transparent glass body while the optically transparent body and said focused laser output move relative to one another in X-Y-Z directions. The at least one hole track pattern is in contact with the liquid and the focused laser output, in conjunction with the liquid, creates at least one hole in the optically transparent body.

Laser direct ablation (LDA) produces patterns cut into a dielectric layer for the formation of electrically conductive traces with controlled signal propagation characteristics. LDA processing includes selecting a dose fluence for removing a desired depth of material along a scribe line on a surface of a workpiece, selecting a temporal pulsewidth for each laser pulse in a series of laser pulses, and selecting a pulse repetition frequency for the series of laser pulse. The pulse repetition frequency is based at least in part on the selected temporal pulsewidth to maintain the selected dose fluence along the scribe line. The selected pulse repetition frequency provides a predetermined minimum overlap of laser spots along the scribe line. The LDA process further includes generating a laser beam including the series of laser pulses according to the selected dose fluence, temporal pulsewidth, and pulse repetition frequency.

The invention relates to the field of laser, and provides a picosecond pulse optical fiber laser device comprising a mode-locking picosecond pulse optical fiber laser device seed source, a first-order amplification system, a first band-pass optical fiber filter, a second-order amplification system, an acoustic-optical modulator, a second band-pass optical fiber filter, a third-order amplification system, a fourth-order amplification system and an output end cap. The switching period and the opening time of the acoustic-optical modulator are regulable. Pulse output frequency is regulated by regulating the switching period, and the number of pulses is regulated by regulating the opening time so that low-frequency and high-peak-power laser pulses are obtained. Frequency modulation is performed by the acoustic-optical modulator so that low-frequency picosecond pulses are obtained, and then the stable, low-frequency and high-peak-power picosecond laser pulses are obtained through all orders of the amplification systems. The picosecond pulse optical fiber laser device is simple in structure, multiple universal devices are specially and reasonably designed and the functions are enabled to coordinate ingeniously so that stable, frequency-regulable and high-peak-power picosecond laser output can be realized, and thus the picosecond pulse optical fiber laser device has wide application in the field of laser processing and the like.