3 results about "Ultrashort laser" patented technology

The present invention relates to a method for dividing a workpiece (1) having a transparent material, wherein a material modification (5) is introduced into the transparent material of the workpiece (1) along a dividing line (4) by means of ultrashort laser pulses of an ultrashort pulse laser (2), and subsequently the material of the workpiece (1) is divided along the resulting material modification surface (50) by a dividing step, wherein the laser pulses are brought onto the workpiece (1) at an attack angle (α), and the material modification (5) is of type I and / or type II modification associated with a refractive index change of the material of the workpiece (1).

The invention discloses a far-field signal-to-noise ratio measuring device and method for ultra-strong and ultra-short laser pulses, and belongs to the technical field of laser measurement. After ultra-short pulses to be measured pass through a beam splitter, a light path of signal light to be measured is adjusted by using a first reflector and a second reflector, and the moment when the signal light to be measured reaches a focus position is adjusted by using a delay line; the other path of reference light is subjected to frequency doubling by using a frequency doubling crystal and then is subjected to light splitting by using a dichroscope, the fundamental frequency light as the reference light is adjusted and delayed by a delay line and then reaches the same focal position as the signal light, interference occurs at the focal position, and gas is ionized to form a plasma grating; the frequency doubling light irradiates the plasma grating, diffraction light signals of the probe light under different time delay conditions are read through a CCD, and then signal-to-noise ratio data of the pulse to be measured are obtained through measurement; according to the invention, signal-to-noise ratio data of ultra-short and ultra-strong laser pulses at a far-field position is realized for the first time, and the device has the characteristics of simple optical path, convenient adjustment and accurate pre-pulse measurement for a small laser device.

The invention relates to a method for separating at least partially transparent material (1), wherein a single laser pulse and / or an ultrashort laser pulse comprising a plurality of sub-laser pulses is focused into the material (1) such that a modification zone (602) produced and elongated in the direction of beam propagation enters into the material (1) and penetrates at least one surface (14) of the material, wherein a material modification (3) is thereby introduced into the material (1), wherein a plurality of material modifications (3) are introduced into the material (1) along a separation line (2), and wherein the material (1) is subsequently separated along the separation line (2) by means of a separation step, and wherein the pulse energy of the single laser pulse or the sum of the pulse energies of the sub-laser pulses is in the range from 500 µJ to 50 mJ.