4results about How to "Narrow pulse width" patented technology

This invention discloses a high-voltage nanosecond pulse shaping device and method based on magnetic devices. The device includes: a first magnetic transmission line and a second magnetic transmission line, with their input ends connected in parallel and connected to an initial pulse source; the output end of the first magnetic transmission line is connected to a load terminal; the output end of the second magnetic transmission line is short-circuited to ground; the first magnetic transmission line includes a first magnetic ring arranged along the axial direction and an outer magnetic field coil; the second magnetic transmission line includes a second magnetic ring arranged along the axial direction. Based on the current-dependent nonlinear permeability effect of the magnetic ring, this device simultaneously achieves pulse rise time compression, fall time truncation, pulse width shortening, and suppression of pre-pulse and tail oscillations through the rising sharpening effect of the first magnetic transmission line and the falling truncation effect of the second magnetic transmission line. This overcomes the limitation of single nonlinear transmission line or magnetic switching technology, which can only optimize single pulse parameters, and can obtain high-quality pulse waveforms at the load terminal.

The application provides a planar color hot stamping equipment based on laser transfer printing, which comprises a control system, a laser, an XY two-dimensional scanning galvanometer system, a feeding unit and a three-primary-color hot stamping film; the three-primary-color hot stamping film comprises a carrier substrate and a three-primary-color pigment layer coated on the carrier substrate; the carrier substrate is required to have laser transparency and non-absorption; the three-primary-color pigment layer comprises a red color region, a green color region and a blue color region, and each color region is coated with a thin planar film formed by the color coating. The application can realize pigment deposition at any position of the object to be printed through the scanning of the XY two-dimensional scanning galvanometer system, and can conveniently realize large-format color hot stamping; and through the regulation and control of process parameters such as laser pulse energy, pulse number and the like, different amounts of three-primary-color pigment jetting mixing can be realized, and the color reproduction degree is high. The application also simultaneously provides a planar color hot stamping method based on laser transfer printing.

The application provides a tunable pulse train laser and a design method thereof, the laser comprising a pumping light fiber coupling focusing system, a cavity mirror, a laser crystal, a passive Q-switching crystal, an active Q-switching system and a laser output mirror arranged in sequence according to an optical path; the tunable pulse train laser is configured to: in a working state, through the equivalent length control of the passive Q-switching crystal and the modulation control of the active Q-switching system, the number of pulse trains is controlled under the same main frequency, or the same pulse train is output under different main frequencies. The application uses the active Q-switching system and the passive Q-switching crystal in cooperation, uses the active Q-switching and the passive Q-switching in combination to obtain the output of the main frequency plus the pulse train, is favorable for the multiple processing at the same point in the fine machining, and the single pulse energy is constant, thereby providing a pulse train laser scheme which is lower in cost, more ingenious and simple in structure, good in regulation flexibility, and higher in stability and reliability of the laser.

The invention discloses a passively Q-switched pulse type true three-level solid laser which comprises a pumping source, a pumping light focusing and coupling system, a laser crystal and a passively Q-switched crystal which are sequentially arranged in the light path direction. The laser crystal is Nd: YVO4, and the end face, close to the pump light focusing coupling system, of the laser crystal is plated with a laser resonant cavity total reflection mirror. The passive Q-switched crystal is Cr: YAG, and the end face, away from the laser crystal, of the passive Q-switched crystal is plated with a laser resonant cavity coupling output mirror. The laser crystal is tightly attached to the Cr: YAG crystal, and the pump light incident end face of the Nd: YVO4 crystal and the laser emergent end face of the Cr: YAG crystal jointly form a laser resonant cavity; by optimizing the initial transmittance of the Cr: YAG crystal and the transmittance of the plated coupling output mirror, quasi-three-level laser transition in the Nd: YVO4 crystal is inhibited, and 880 nm true three-level passive Q-switched pulse laser output with high repetition frequency is realized. The technology has the advantages of being high in repetition frequency, short in wavelength, small in size, narrow in pulse width, convenient to assemble, low in cost, capable of supporting large-scale batch production and the like.