Method and device for measuring up-conversion time discrimination spectrum

A technology for converting time and measurement methods, applied in the field of measurement spectrum, can solve problems such as insufficient analysis of energy level structure, and achieve the effect of improving sensitivity and speeding up

Inactive Publication Date: 2008-10-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the research on upconversion luminescence is still focused on the spectral analysis after continuous laser pumping, and the analysis of the internal energy level structure of the material is still insufficient.

Method used

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  • Method and device for measuring up-conversion time discrimination spectrum
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  • Method and device for measuring up-conversion time discrimination spectrum

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Experimental program
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Embodiment

[0026] The steps of this embodiment are as follows:

[0027] (1) The computer issues an instruction to make the control circuit generate a pulse signal with a frequency of 500Hz and a pulse width of 1us and send it to the laser drive circuit to generate a high-speed constant current pulse to drive the semiconductor laser to generate pulsed laser. The pulse amplitude is set on the driver. set at 6A;

[0028] (2) Excite the sample Y with the generated pulsed laser 2 o 3 : Er, Yb, generate up-converted luminescent signal, after the optical signal is split by the monochromator, it is converted into an electrical signal by the photomultiplier tube;

[0029] (3) Set the wavelength scanning range of the monochromator to 500-700nm and the integration time of the lock-in amplifier to 1s on the computer, and the controller issues instructions to control the monochromator to perform wavelength scanning, and the lock-in amplifier locks the signal of the photomultiplier tube Zoom in, co...

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Abstract

The invention discloses a method and a device for measuring up-conversion time resolved spectrum. A high power continuous photosemiconductor laser is driven by a high pulse pumping source to generate laser and to excite a sample to carry out up-conversion luminescence. An optical signal is split by a monochrometer, then received by a photomuitplier and converted to an electrical signal. While the monochrometer scans the wave length, a lock-in amplifier locks and amplifies the signal. The up-conversion resolved static-state spectrum is recorded and obtained. The monochrometer fixes the waver length; a digital oscilloscope monitors the pumping source and the luminescent signal to obtain the up-conversion time resolved dynamic-state spectrum. The method and the device are characterized in that the time resolved static-state spectrum and the dynamic-state spectrum in different states are measured through adjusting the pulse width, the frequency and the amplitude of the pulse pumping source; the dynamic mechanical characteristics of material up-conversion luminescence are learned; and the level structure information inside the material is analyzed.

Description

technical field [0001] The invention relates to a method for measuring spectra, in particular to a method for measuring up-converted time-resolved spectra, and at the same time, the invention also relates to a measuring device for measuring up-converted time-resolved spectra. Background technique [0002] Up-conversion refers to the process of converting two or more low-energy photons into one high-energy photon, and generally refers to the phenomenon of converting infrared light into visible light, which is characterized by the energy of the absorbed photon being lower than the energy of the emitted photon. Since up-conversion luminescence involves a multi-photon process, it is different from general down-conversion luminescence, and the luminescence signal has a great relationship with the pulse width, frequency and intensity of the pumped pulsed laser. [0003] At present, the research on upconversion luminescence is still focused on the spectral analysis after continuous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63
Inventor 董宁曲广媛郭海余飞鸿
Owner ZHEJIANG UNIV
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