6results about How to "Short pulse width" patented technology

The invention discloses a method for generating a polarization-adjustable extreme ultraviolet light source, which relates to the technical field of ultrafast laser, and comprises the following steps: preparing different electronic states of triple symmetric molecules; the linear polarization incident laser interacts with different electronic states of the triple symmetry molecules to generate higher harmonics, the included angle between the polarization direction of the linear polarization incident laser and the molecular axis is adjusted until the distribution of ellipsometry of different electronic states along with the arrangement angle is obtained, and the harmonic stages required by the extreme ultraviolet light source with different ellipsometry are selected to generate the extreme ultraviolet light source with different ellipsometry. The harmonic ellipsometry rate in the harmonic stage changes along with the change of the arrangement angle; the wave spectrums of the two harmonic components in the harmonic stage are synthesized into attosecond pulses, and extreme ultraviolet light sources under different ellipsometry rates are obtained after synthesis; the generated extreme ultraviolet light source is adjustable in polarization and short in pulse width.

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 invention provides a piezoelectric micromechanical ultrasonic transducer, a control method and an array. The piezoelectric micromechanical ultrasonic transducer (100) comprises: a substrate (101) provided with a back cavity (102); the composite diaphragm structure is arranged above the back cavity and comprises a piezoelectric film layer (105) used for transmitting and receiving ultrasonic waves based on the piezoelectric effect; the phase change tuning layer (110) is mechanically coupled with the piezoelectric thin film layer and is prepared from a nonvolatile material with reversible mechanical properties, the nonvolatile material has at least two stable phase forms under external excitation, and different phase forms correspond to different mechanical properties; the change of the mechanical property causes the change of the overall effective rigidity of the composite diaphragm structure; and the excitation structure (108) is coupled with the phase change tuning layer and is used for applying external excitation to the phase change tuning layer so as to drive the nonvolatile material to carry out nonvolatile switching among different phase forms, so that frequency tuning of the piezoelectric micromechanical ultrasonic transducer is realized.

The present invention relates to an apparatus and a method for micromachining using a laser beam, the apparatus comprising: a laser beam irradiation unit that irradiates a laser beam to a crystallized machining target through which the laser beam is transmitted to form a machining hole; an optical unit that adjusts the shape of the laser beam so as to partially irradiate the laser beam into the workpiece to non-crystallize the crystallized workpiece; a laser beam adjustment unit and a chemical reaction furnace for removing a processing hole formed in an amorphous region of a processing object by a chemical reaction, the processing object being deposited in a reaction solution accommodated in the chemical reaction furnace; according to the present invention, damage to a crystallized workpiece can be minimized, and an extremely narrow hole having an extremely small three-dimensional shape and having a ratio of the thickness of the workpiece to the diameter of the machined hole of several times to tens of thousands of times can be machined inside the crystallized workpiece.

The embodiment of the invention provides a pulse power supply circuit, a pulse power supply control method, a controller and a medium, and relates to the technical field of power supplies. The circuit comprises a numerical control unit, a power tube array unit and an energy storage array unit, the power tube array unit comprises at least two first power tubes, and any two first power tubes are connected in parallel; the numerical control unit is electrically connected with each first power tube, and each first power tube is electrically connected with the energy storage array unit; wherein the energy storage array unit is used for outputting pulse current when the first power tube is closed; and the numerical control unit is used for controlling the duty ratio of each first power tube so as to control the pulse width of the pulse current output by the energy storage array unit. According to the embodiment of the invention, heat generated by the pulse power supply can be reduced.

The invention discloses a laser radar detection system and method, and belongs to the technical field of detection, and the method specifically comprises the steps that a laser source emits a pulse type detection laser sequence; the counting type photoelectric detector receives a return light signal reflected by a detected object in a field of view through two different modulation phases, and the delay between the two different modulation phases is 180 degrees. Two digital domain counting signals with different phases can be obtained, the common noise problem in an analog signal chain in the prior art is eliminated, and therefore better signal-to-noise ratio performance is shown when narrow pulse optical signals are processed.