Time-Resolved Spectrometer Based on Electronic Synchronization

Abstract

The invention discloses a time-resolved spectrometer based on electronic synchronization, wherein a light source module, a beam combiner, a sample chamber, a filter module, a signal detection module and a data acquisition device are sequentially arranged along the optical path, the light source module includes a plurality of light sources and drivers, the electronic delay module generates electric pulse signals of different timings to trigger each driver and control the timing of the driver operation, each driver drives each light source to emit light, and the multi-path light of different delays output by each light source enters the sample chamber after spatial overlap through the beam combiner, the light that first reaches the sample excites the sample, and the light that arrives later passes through the sample, and after the filter module filters out the unnecessary light, the detection module measures the intensity of the transmitted light, and the data acquisition device collects and records the measured intensity of the transmitted light. The invention can be synchronized by electronics, has a simple structure, is portable, and has greatly improved stability, and can relatively easily obtain time-resolved spectra of different wavelength pumping and detection by integrating more light sources of different wavelengths.

Description

Technical Field

[0001] The invention relates to a spectrometer, in particular to a time-resolved spectrometer based on electronics synchronization. Background Art

[0002] After a material is excited by light, its physical and chemical properties will change over time, which is called a kinetic process. For example, after solar cells, photocatalytic materials, photosensitive molecules, etc. are excited by light, the carriers or molecules in the excited state will relax to the ground state over time through radiation or non-radiation processes. One technology to study these kinetic processes is time-resolved spectroscopy. In terms of the time domain, time-resolved spectroscopy ranges from ultrafast femtoseconds and picoseconds to nanoseconds, microseconds, milliseconds, seconds and other macroscopic time scales. Conventional time-resolved spectroscopy methods with resolutions down to picoseconds generally require a picosecond or femtosecond laser light source and a wavelength-tunable laser pulse, and change the delay through an optical delay method. The system is large, has poor stability, high cost, and is difficult to maintain. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a time-resolved spectrometer based on electronic synchronization to solve the problems of complex structure and poor stability of existing picosecond time-resolved spectrometers.

[0004] Technical solution: The time-resolved spectrometer based on electronic synchronization described in the present invention is provided with a light source module, a beam combiner, a sample chamber, a filter module, a signal detection module and a data acquisition device in sequence along the optical path. The light source module includes a plurality of light sources and drivers. The driver is electrically connected to the light source, and the driver is electrically connected to the electronic delay module. The signal detection module is electrically connected to the data acquisition device. The electronic delay module generates electrical pulse signals with different time sequences to trigger each driver to work in time sequence. Each driver drives each light source to emit light. The multi-path light with different delays output by each light source passes through the beam combiner and then overlaps in space before entering the sample chamber. The light that reaches the sample first excites the sample, and the light that reaches later passes through the sample. After the unnecessary light is filtered out by the filter module, the detection module measures the intensity of the transmitted light, and the data acquisition device records the intensity of the transmitted light.

[0005] Wherein, the light source module is a free-space coupled laser diode, a fiber-coupled laser diode or a light emitting diode.

[0006] The beam combiner is at least one of a combination of a reflector and a beam combiner, a fiber-coupled beam combiner, a wave plate and a polarization beam splitter.

[0007] The optical filter module is at least one of an optical filter, a grating and a slit combination, a fiber Bragg grating, a volume Bragg grating and a monochromator.

[0008] The signal detection module is any one of a photodiode, an avalanche photodiode, a photomultiplier tube, a CCD and a CMOS.

[0009] The data acquisition device is a PC.

[0010] The data acquisition device is electrically connected to the electronic delay module to drive the electronic delay module to work.

[0011] Beneficial effects: The present invention can be synchronized through electronics, has a simple and portable structure, and greatly improved stability. By integrating more light sources of different wavelengths, it is relatively easy to obtain time-resolved spectra of different wavelength pumping and detection. The structure is simple and stable, and time-resolved spectral measurements over a wide range of time scales from picoseconds, nanoseconds, microseconds, milliseconds to seconds can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] A schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] like Figure 1As shown, the time-resolved spectrometer based on electronic synchronization of the present invention is provided with a light source module, a beam combiner, a sample chamber, a filter module, a signal detection module and a data acquisition device in sequence along the optical path. The light source module includes a plurality of light sources and drivers. The driver is electrically connected to the light source, and the driver is electrically connected to the electronic delay module. The electronic delay module generates electrical pulse signals of different timings to trigger each driver and control the timing of the driver's operation. Each driver drives each light source to emit light. The delayed multi-path light output by each light source enters the sample chamber after spatial overlap through the beam combiner. The light that reaches the sample first excites the sample, and the light that reaches later passes through the sample. After the unnecessary light is filtered out by the filter module, the detection module measures the intensity of the transmitted light, and the data acquisition device records the intensity and delay of the transmitted light. The light source module is a free-space coupled laser diode, a fiber-coupled laser diode, a light emitting diode, a laser diode as a light source amplified by a laser amplifier as a seed light, a laser diode as a seed light amplified by a laser amplifier, and then pumping an optical parametric amplifier to generate a wavelength-tunable laser, a laser diode as a seed light amplified by a laser amplifier, and then pumping a nonlinear crystal, such as LiB3O5, β-BaB2O4, LiNbO3 and other crystals, to generate a harmonic laser, a laser diode as a seed light amplified by a laser amplifier, and then pumping a material to generate supercontinuum white light or light of other wavelengths, such as any one of sapphire crystals, calcium fluoride crystals, water, photonic crystals, and gases; the driver drives the light source module to emit light, and can generate different currents and different pulse widths, so that the light source module generates light pulses with different pulse widths and different intensities.It can also have the function of regulating the temperature of the light source module, and adjust the wavelength emitted by the light source module within a certain range. The start time of the pulse output by the driver is controlled by the rising edge or falling edge of the pulse of the electronic delay module; the pulse width of the driver output can be controlled by the module itself, or determined by the pulse width of the electronic delay module; the electronic delay module can generate electrical pulse signals with different timings to one or more drivers, which are used to trigger different drivers and control the timing of each driver's operation. The rising edge or falling edge of the output pulse of the electronic delay module triggers the driver module to output the pulse at a certain time, and the pulse width of the output pulse of the electronic delay module can also determine the output time and output pulse width of the driver module at the same time. The electronic delay module can control the delay between each electrical pulse, from picoseconds, nanoseconds, microseconds, milliseconds, seconds and longer times, as well as different pulse widths, from picoseconds, nanoseconds, microseconds, milliseconds, seconds and longer times; the beam combiner is used to process the light source The multi-path light output by the module overlaps in space on the sample, and is one or more of a reflector and beam combiner combination, a fiber-coupled beam combiner, a wave plate and a polarization beam splitter combination; the sample chamber is used to place the sample to be tested, and one or more beams of light generated by the light source module pass through the sample, excite the sample, and the sample absorbs and reflects the light; the filter module improves the signal-to-noise ratio by filtering out non-signal light, and is one or more of a filter, a grating and slit combination, a fiber Bragg grating, a volume Bragg grating, and a monochromator; the signal detection module is a module for detecting signals, and is any one of a photodiode, an avalanche photodiode, a photomultiplier tube, a CCD, and a CMOS; the data acquisition device records delays and signals, and can also control what timing the electronic delay module outputs and which driver module to drive, so as to achieve one or more light source modules outputting a certain or certain specific wavelengths and record the signal size of the wavelength, and the data acquisition device is a PC.

[0015] When the present invention is working, the data acquisition device controls the electronic delay module to generate two pulses with a certain delay. These two pulses trigger two driver modules respectively, so that two light sources generate two beams of light with a certain pulse width and a certain delay. One beam of light is used as pump light to excite the sample, and the other beam of light is used as detection light. The signal detection module measures the intensity of the transmitted light after the detection light passes through the sample under the delay, and the data acquisition device records the intensity of the transmitted light under this delay. The delay of the two beams of light is continuously changed through the electronic delay module, and finally the intensity of the transmitted light under different delays is obtained, which is a set of time-resolved absorption spectra. The intensity of the reflected light or scattered light of the detection light on the sample can also be measured to obtain a time-resolved spectrum. The data acquisition device may not control the electronic delay module, but only record the delay. The delay module can change the delay in other ways, such as manually changing the delay between each light pulse of the electronic delay module. In some time-resolved spectra, more than two light pulses of a certain time sequence can also be generated. For example, in time-resolved stimulated Raman spectroscopy, one beam of light is used to pump the sample, and the other two beams of light are used to generate the stimulated Raman process as detection light. By changing the delay between the pump light and the detection light, the time-resolved stimulated Raman spectroscopy is obtained.

Claims

1. A time-resolved spectrometer based on electronic synchronization, characterized in that: A light source module, a beam combiner, a sample chamber, a filter module, a signal detection module and a data acquisition device are sequentially arranged along the optical path. The light source module includes a plurality of light sources and drivers. The driver is electrically connected to the light source, and the driver is electrically connected to an electronic delay module. The signal detection module is electrically connected to the data acquisition device. The electronic delay module generates electrical pulse signals with different time sequences to trigger each driver to work in time sequence. Each driver drives each light source to emit light. Multiple light paths with different delays output by each light source enter the sample chamber after spatial overlap through the beam combiner. The light that reaches the sample first excites the sample, and the light that reaches the sample later passes through the sample. After the unnecessary light is filtered out by the filter module, the detection module measures the intensity of the transmitted light, and the data acquisition device records the intensity of the transmitted light.

2. The time-resolved spectrometer based on electronic synchronization according to claim 1, characterized in that: The light source module is a free-space coupled laser diode or an optical fiber coupled laser diode.

3. The time-resolved spectrometer based on electronic synchronization according to claim 1, characterized in that: The beam combiner is at least one of a combination of a reflector and a beam combiner, a fiber-coupled beam combiner, a wave plate and a polarization beam splitter.

4. The time-resolved spectrometer based on electronic synchronization according to claim 1, characterized in that: The optical filter module is at least one of an optical filter, a grating and a slit combination, a fiber Bragg grating, a volume Bragg grating and a monochromator.

5. The time-resolved spectrometer based on electronic synchronization according to claim 1, characterized in that: The signal detection module is any one of a photodiode, an avalanche photodiode, a photomultiplier tube, a CCD and a CMOS.

6. The time-resolved spectrometer based on electronic synchronization according to claim 1, characterized in that: The data acquisition device is a PC.

7. The time-resolved spectrometer based on electronic synchronization according to claim 1, characterized in that: The data acquisition device is electrically connected to the electronic delay module to drive the electronic delay module to work.

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