10results about How to "Narrow pulse width" patented technology

The invention discloses a 1.5-1.6 [mu] m wave band passive Q-switched pulse laser, and belongs to the technical field of laser devices. According to the passively Q-switched pulse laser, the Er < 3 + > / Yb < 3 + > double-doped YPO4 crystal (Er < 3 + >: Yb < 3 + >: YPO4) with high thermal conductivity, long laser upper-energy-level fluorescence lifetime and high Yb < 3 + >-> Er < 3 + > energy transfer efficiency is adopted as a gain medium, and a semiconductor laser pulse pumping scheme is utilized, so that human-eye-safe 1.5-1.6 [mu] m waveband pulse laser with stable operation, high energy, high repetition frequency and narrow pulse width is realized; the light source can be used as a detection light source of laser range finders and laser radars.

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 present invention discloses a pulse laser ablation system, comprising a first light source, a first light path homogenization system, an ablation catheter and an OCT imaging system, wherein the first light source is used to generate an initial light beam; the light path homogenization system is used to homogenize and shape the initial light beam into a light beam with uniform energy distribution; the beam combining and focusing system is used to combine the homogenized light beam of the light path homogenization system, and focus and couple it to the ablation catheter; the ablation catheter and the OCT imaging system cooperate to treat pathology; the femtosecond has the narrowest pulse width of all types of lasers, and its peak power is the highest under the same single pulse energy. The ultrashort pulse it generates has an extremely short action time with the material, and will not cause thermal effects on the surrounding materials, and has better processing effect and processing efficiency; an optical coherence tomography probe is added to monitor the laser ablation process in real time, and the real-time feedback signal of the lesion can also provide a basis for parameter setting for further treatment.

The fiber femtosecond laser oscillator provided by the present application comprises a pump laser (6) and a pump laser (7) which respectively pump the corresponding first optical fiber (2) and the second optical fiber (3) to generate output light with a wide spectrum. The output light passes through a dispersion control device (4) which adjusts the output light into a multi-wavelength light beam which is linearly distributed in space. The multi-wavelength light beam passes through a reflective end mirror (5) to perform spectrum screening on the output light again. The light beam after spectrum screening is then transmitted to the mode-locking device (1) through the dispersion control device (4), the second optical fiber (3) and the first optical fiber (2) in sequence. The mode-locking device (1) then fixes the phase relationship of the output light, compresses the pulse width and emits a light pulse of the femtosecond order. The fiber femtosecond laser oscillator provided by the present application broadens the gain bandwidth of the femtosecond laser oscillator by adding a new gain medium in the oscillator, so that the output femtosecond laser pulse with a wider spectrum and narrower pulse width is output.

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.

The invention provides a miniaturized all-solid-state laser and a laser detection system, and the laser comprises a shift signal generation module (1) which is used for generating multiple shift square wave signals; the multi-path pulse constant current driving module (2) is used for converting the multi-path shift square wave signals into multi-path constant pulse current; the semiconductor laser array pumping module (3) is used for generating a plurality of paths of pumping light signals according to a plurality of paths of constant pulse current driving modes; the laser bonding crystal (4) is used for converting multiple paths of pump light signals into multiple paths of laser pulse signals in a passive Q-switching mode; the micro detection array module (5) is used for monitoring the multiple paths of laser pulse signals and generating multiple paths of negative pulse electric signals synchronous with the multiple paths of laser pulse signals; the optical synchronization signal feedback module (6) is used for converting the multi-path negative pulse electric signals into negative pulse synchronization feedback signals and inputting the negative pulse synchronization feedback signals into the multi-path pulse constant-current driving module (2) to form a negative feedback network; and the optical distribution module (7) is used for changing the propagation direction of the multiple paths of laser pulse signals.

The utility model proposes a laser receiving circuit and a laser radar, and the laser receiving circuit comprises a plurality of photoelectric detection circuits, a plurality of blocking circuits, an analog switch circuit, and a bandwidth compensation circuit, and the photoelectric detection circuits carry out photoelectric conversion and output echo electric signals. The multi-path echo electric signals are selectively output through the analog switch circuit after direct blocking processing, the bandwidth compensation circuit carries out bandwidth compensation on the echo electric signals output by the analog switch circuit, the equivalent bandwidth of the analog switch circuit is improved, and therefore the influence of the analog switch circuit on the echo electric signals is reduced. And the echo electric signal can meet the requirements of narrow pulse width and fast rising edge.

The invention discloses an intermediate infrared thermal depolarization compensation laser based on a trapezoidal electro-optical crystal. Belongs to the technical field of laser, and particularly relates to the technical field of vortex light spot ring pulse continuous laser systems. The problems that the cavity length of a resonant cavity is increased, the structure of the resonant cavity is complicated and the compensation effect is limited in a conventional thermal depolarization compensation mode are solved. The laser comprises a trapezoidal photoelectric Q-switched crystal, a 45-degree total reflective mirror, a 45-degree polarizing beam splitter, an LD side pump module and a total reflective mirror. One side edge of the trapezoidal photoelectric Q-switched crystal shares a light path with the 45-degree polarizing beam splitter, the LD side pump module and the total reflective mirror, and the other side edge of the trapezoidal photoelectric Q-switched crystal shares a light path with the 45-degree total reflective mirror; and the 45-degree total reflective mirror and the 45-degree polarizing beam splitter share the same optical path.