73 results about "Pump probe" patented technology

The invention discloses a spatially-separated pump-probe transient absorption spectrograph and a realization method. The realization method is characterized by generating a light source through a femtosecond light source system; realizing the beam splitting of pump light and probe light through a beam splitter; realizing the different time delay of the probe light through a time delay line; realizing the two-dimensional rotation and the calibration of the probe light within a horizontal plane and a vertical plane through a sweep reflector group; calibrating which means guaranteeing the incidence of the rotated probe light into a aperture within the front section of an objective lens; finally, obtaining a two-dimensional image formed on a sample under the combined action of the probe light and the pump light by a data collection system. According to the spatially-separated pump-probe transient absorption spectrograph and the realization method, the extremely high spatial discrimination can be realized, and moreover, the visual probe of carriers, excitors or plasmons can be realized.

Apparatus and methods of four wave mixing (FWM) holography are described, including illuminating a sample with a first beam, a second beam, and a third beam, and combining the generated FWM signal with a reference beam at a imaging device to obtain holographic image data. In some examples, the first and second beams may be provided by a single pump-probe beam. The third beam may be a Stokes beam or an anti-Stokes beam. A representative example is coherent anti-Stokes Raman holography (CARS holography), which includes illuminating a sample with a pump/probe beam and a Stokes beam to obtain a CARS signal from the sample; and combining the CARS signal with a reference beam to obtain a CARS hologram.

The use of optical microcavities, high-Q resonators and slow-light structures as tools for detecting molecules and probing conformations and measuring polarizability and anisotropy of molecules and molecular assemblies using a pump-probe approach is described. Resonances are excited simultaneously or sequentially with pump and probe beams coupled to the same microcavity, so that a pump beam wavelength can be chosen to interact with molecules adsorbed to the microcavity surface, whereas a probe beam wavelength can be chosen to non-invasively measure pump-induced perturbations. The induced perturbations are manifest due to changes of resonance conditions and measured from changes in transfer characteristics or from changes of the scattering spectra of a microcavity-waveguide system. The perturbations induced by the pump beam may be due to polarizability changes, changes in molecular conformation, breakage or formation of chemical bonds, triggering of excited states, and formation of new chemical species. Furthermore, heat may be generated due to absorption of the pump beam. Furthermore, the use resonant modes with different states of polarization allows for measurements of polarizability and its anisotropy in samples interacting with the optical device.

The invention relates to a method for generating two delayed pulses, in particular in terahertz spectroscopy and/or in pump-probe experiments, with the following method steps:

• • generating a pulsed beam using a beam source, in particular a pulsed laser;
  • dividing the pulsed beam, wherein a first partial beam contains a first pulse and a second partial beam contains a second pulse;
  • directing the two pulses onto a respective target area, wherein the first pulse directly reaches a first target area and the second pulse reaches a second target area after covering a delay path, and wherein the two target areas may coincide;
  • using the two pulses, in particular for a measuring method;
  • wherein a time delay of the two pulses in the respective target area is adjustable by means of a pulse repetition rate of the pulsed beam.

The invention relates to a miniature helium optical pump magnetometer applicable to a small-sized aircraft, comprising a mainframe, a helium optical pump probe A and a helium optical pump probe B, wherein a motherboard, a helium optical pump magnetometer circuit, a GPS (Global Positioning System) board and a switching power supply module are arranged in the mainframe; the motherboard is respectively connected with the helium optical pump magnetometer circuit, the GPS board, a serial port A, a serial port B and a serial port C; the helium optical pump magnetometer circuit is connected with the helium optical pump probe A by an interface of the helium optical pump probe A and connected with the helium optical pump probe B by an interface of the helium optical pump probe B; an input end of the switching power supply module is connected with a power supply input interface by a power supply switch; and an output end of the switching power supply module is respectively connected with the motherboard, the GPS board and the helium optical pump magnetometer circuit. The miniature helium optical pump magnetometer provided by the invention has the advantages of small volume, light weight, low power consumption, and capabilities of automatically collecting multiple data in an unmanned way and replacing an optical pumping magnetometer, a magnetic compensating instrument and an aviation comprehensive data collecting system in the traditional aeromagnetic survey system.

The invention provides a once signal to noise ratio measuring method and a device based on a chirp pulse feature. The once signal to noise ratio measuring method and the device based on the chirp pulse feature can measure a signal to noise ratio of a once pulse. The principles include that a pumping probe light path is built by optical Kerr effect. The measuring device broadens probe light as chirp laser pulse in time and space by a grating or a prism. The probe light transmits from an analyzer due to the optical Kerr effect, a transmitted signal is collected by a scientific-level charge-coupled device (CCD), and signal to noise ratio of the laser pulse to be detected is obtained. The method introduces large negative dispersion amount by the grating or the prism, broadens probe light pulse to hundreds of picoseconds or more, and enables time window to reach hundreds of picoseconds or more. Meanwhile, a spatial light modulator is inserted in the probe light path so as to finally increase dynamic scopes.

A pump probe measuring device (1) includes an ultrashort optical pulse laser generator (11) for generating a first ultrashort optical pulse train, which becomes a pump light, and a second ultrashort optical pulse train, which becomes a probe light, a delay time adjusting unit (15) for adjusting a delay time between ultrashort optical pulse trains, a first pulse picker and a second pulse picker (13, 14) for accepting each of the first and the second ultrashort optical pulse trains and allowing only one pulse to be transmitted at an arbitrary repetition periodicity, thus reducing the effective repetition frequency of the optical pulses, a delay time modulation unit (10) for periodically changing a position through which pulses are transmitted by the first and the second pulse pickers (13, 14), an irradiation optical system (16) for applying pump light and probe light to a sample (19), a measuring unit (20) for detecting probe signals from a sample (19), and a lock-in amplifier (18).

The invention discloses a super-resolution method based on a pumping-probe technology. The super-resolution method is characterized in that a first light beam irradiates a sample and the atoms of the sample are transitioned to an excited state, a second light beam forms hollow light spots on the sample after phase modulation and excites signal light, and a third light beam forms hollow light spots on the sample and excites signal light. The super-resolution method comprises the following steps: controlling the frequency of the third light beam to be V1, detecting the signal light with the frequency being V1 and obtaining a first signal light intensity I1(x, y); controlling the frequency of the second light beam to be V2, detecting the signal light with the frequency being V1 and obtaining a second signal light intensity I2(x, y); and calculating effective signal light intensity I (x, y) at all scanning points, wherein x and y are two-dimensional coordinates of the scanning points, thus obtaining a super-resolution microscopic image. The invention also discloses a super-resolution device based on a pumping-probe technology. The super-resolution method and the super-resolution device have the advantages that the imaging speed is high, differentiated images can be scanned simultaneously, and the stimulated radiation is faster than spontaneous radiation of the original method.

The invention provides a multi-rotor unmanned aerial vehicle helium optical pump aeromagnetic measurement system. The multi-rotor unmanned aerial vehicle helium optical pump aeromagnetic measurement system comprises carbon fiber propellers, brushless motors with magnetic shielding functions, carbon fiber arms, a carbon fiber frame, an external cover, a magnetic probe rod, a battery, a digitized helium optical pump magnetometer host, a magnetic probe collection and release system, a flight control data transmission module, a long-distance Bluetooth communication module, a GPS antenna, a helium optical pump probe, a magnetic compensation coil, a magnetometer monitoring panel and a flight control panel. The multi-rotor unmanned aerial vehicle helium optical pump aeromagnetic measurement system has low requirements for take-off and landing sites, can carry out hovering fixed-point magnetic field measurement and has a hardware magnetic compensation function; the magnetic probe has a collection and release function; the arms can be folded so as to transferred; and the multi-rotor unmanned aerial vehicle helium optical pump aeromagnetic measurement system is very suitable for small-areas aeromagnetic measurement conditions such as archaeology, river pipeline detection and non-explosive search.

A pump probe measuring device (1) comprises: an ultrashort optical pulse laser generator (2) for generating a first ultrashort optical pulse train which is a pump light (3a), second and third ultrashort optical pulse trains (3b), (3c) which are probe lights; an optical shutter unit (6) to which the second and the third ultrashort pulse trains (3b), (3c) are introduced; and a detecting unit (20) including an irradiation optical system (8) for directing the pump light (3a), the first probe light (3b) and the second probe light (3c) to a sample (7), a sensor (11) for detecting a probe signal from the sample (7), and a phase-sensitive detecting means (12) connected to the sensor (11). An optical shutter control unit (10) periodically modulates the delay time of the first probe light (3b) and that of the second probe light (3c) with respect to the pump light (3a), and the modulated first and second probe lights (3a), (3b) illuminate the sample (7) alternately to detect the probe signals from the sample (7) by the phase-sensitive detecting means (12) in synchronization with the periodic modulation signal of the delay time.

The invention discloses an extracorporeal circulation cancer cell purification system, which includes a probe pump for providing probes for cobalt ferrite-coupled tumor-specific antibodies, which are set on the channel of the extracorporeal circulation based on connecting pipelines, A blood pump providing circulation power and a magnetic separator with a built-in magnetic separation column, wherein the magnetic separator is located at the rear stage of the probe pump. The invention can flexibly capture CTCs in or in vivo and purify the blood, thus providing a brand-new approach for reducing the occurrence of malignant tumor metastasis.

The invention discloses a pump-probe method based on Z-scan. A laser beam is divided into two beams; pumping light is focused on samples to be measured through time delay, so that a non-linear sample generates nonlinear absorption and nonlinear refraction; emergent probe light is divided into two beams through a spectroscope, wherein one beam directly enters a first probe, and the other beam enters a second probe after passing through a diaphragm of small pore diameter with a center coinciding with an optic axis. The pump-probe method is characterized in that phase objects are arranged in the front of a convex lens in a probe light path; the method for measuring the light comprises the following steps: (1) the samples to be measured are put in place, and the energy of the probe light at different times is collected by two probes respectively; (2) a energy curve of the probe light at different delay times is processed, so as to obtain optical nonlinear parameters. A measuring system working according to the method has the advantages that the light path is simple; the data treatment is simple; nonlinear absorption and refraction can be measured simultaneously without the need of separate measurement, and the size and the symbol of the nonlinear refraction can be measured simultaneously; the measuring results are accurate, etc.

The invention discloses a phase object Z-scan-based pump-probe method, which includes the following steps: an incident laser beam is split into two beams, the beam with high intensity is pump light, the beam with low intensity is probe light, and the pump light is delayed and focused on a non-linear sample to be tested, so that the sample to be tested, which is in the ground state, generates non-linear absorption and non-linear refraction; the sample to be tested is located on the focal plane of a lens in a probe light path, a round diaphragm and a round baffle, the centers of which are superposed with the optical axis, are placed at a far-field position in the probe light path behind the sample to be tested, the emergent probe light is split into two beams by a spectroscope, one of the beams directly enters a first probe, and the other beam enters a second probe after passing through the diaphragm and the baffle. A measuring system which operates according to the method is highly sensitive and can simply process data, non-linear absorption and non-linear refraction can be measured simultaneously rather than separately, and the method has the advantages of accurate measurement results and the like.

A pump-probe LFP system is adapted to a substantially lower energy requirement of a pump light source and a probe light source. The LFP system includes a photonic crystal fiber based probe light source, a pump light source adapted to produce light pulses with nanojoule or higher energy, a main laser source to generate a first beam portion to the probe light source and a second beam portion to the pump light source, a delay generator, computer, an optical modulator, and a detector. One or more lenses can be used to focus the light beams to areas less than about 1 micron on a sample, where the sample can be rastered to provide domain specific flash photolysis data of the sample.

The invention discloses an intelligent digital helium optically-pumped magnetometer. A helium optically-pumped probe is connected with a controlled power source, a radio frequency signal conditioning unit, a lamp room brightness detection unit and a resonant signal conditioning unit respectively; the controlled power source, the radio frequency signal conditioning unit, the lamp room brightness detection unit and the resonant signal conditioning unit are all connected with an FPGA (Field Programmable Gate Array) module; the FPGA module is connected with a DSP (Digital Signal Processor) module; a communication interface is connected with the DSP module. The intelligent digital helium optically-pumped magnetometer has the beneficial effects of high digitization and degree of intelligence, wide range, high stability, lamp room brightness self-detection, resonant signal quality self-detection, functional performance self-detection, fault positioning, frequency response self-regulation and the like. In addition, an RS422 interface and a wireless 1553B bus are also integrated, and data of other equipment on an aircraft can be received for processing and then is uploaded.

The invention provides a measurement device and a measurement method for a magnetic field generated by the strong laser driven high-density plasma. The device comprises a 4f system formed by two convex lenses, a quarter-wave plate, a polarization beam splitter, a polarizer, a CCD camera and a computer terminal. The invention discloses an ultrafast noncontact magnetic field measurement method. Withapplication of the device and the method, the problem that the scattered light of the main pulse interferes the information carried by the probe light in the experiment of measuring the magnetic field generated by the strong laser driven high-density plasma through the Farley's rotation effect and the pump probe method can be solved so that the magnetic field measurement accuracy can be enhanced.

The invention discloses a high-sensitivity material optical nonlinearity measurement pump-probe method. A laser beam is divided into two beams, and a sample is located a certain distance behind the focus of a lens, so that the change of far-field spots is maximized. Pumping light acts on the sample to be detected through time delay, so that the nonlinear sample conducts nonlinear absorption and nonlinear refraction; emergent probe light is divided into two beams by a spectroscope, one beam enters a first probe, and the other passes through a circular baffle of which the center is superposed with the optical axis and then enters a second probe. The method is characterized in that in the path of the probe light, the circular baffle of which the center is superposed with the optical axis is placed on the far field, and the sample is located a certain distance behind the focus of the lens, so that the change of far-field spots is maximized. The following measurement steps are included: firstly, placing the sample to be detected, using the two probes to respectively collect the energies of probe light at different times; secondly, processing probe light energy curves at different delay times to obtain optical nonlinearity parameters. A measurement system working according to the method is extremely high in sensitivity and simple in data processing, realizes simultaneous but not separated measurement of nonlinear absorption and nonlinear refraction, can distinguish nonlinear refraction symbols and is accurate in measurement result.

A new technique which uses a pump-probe methodology to place a molecule into one or more excited rotational and/or vibrational states. By evaluating spectral changes due to at least one discrete frequency of pump photons a multi-dimensional characterization of the molecule's excited state energy level results. This multi-dimensional characterization typically involves evaluating the changes between excited and unexcited state measurements. The differential nature of the evaluation makes the technique self-referencing and solves problems common to many spectroscopic techniques. The multi-dimensionality of the technique provides high specificity and immunity to interferents. The preferred embodiments involve excitation by using photons suited to pumping the rotational states and evaluating the effects by probing the energy levels of one of more vibrational states. The technique is capable of detecting bulk and trace concentrations of a molecule in gas, liquid and solid phases, both in pure form and in the presence of other molecules.