System and method for testing diffraction efficiency of acousto-optic tunable filter
A diffraction efficiency and test system technology, which is applied in the field of acousto-optic tunable filter diffraction efficiency test system, can solve problems such as laser energy instability, energy meter probe response inconsistency, measurement error, etc., to offset energy instability, The effect of improving test accuracy
Inactive Publication Date: 2011-04-27
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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[0007] The purpose of the present invention is to provide a device for measuring the diffraction efficiency of AOTF to solve the technical problems of measurement errors caused by unstable laser energy and inconsistent responses of energy meter probes
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[0023] The following is based on Figure 4 A preferred embodiment of the present invention is given to illustrate the structural features and method of practice of the present invention, but not to limit the scope of the present invention.
[0024] The acousto-optic tunable filter diffraction efficiency test system includes the following parts:
[0025] 1) Wavelength tunable laser 1: EKSPLA NT342 / 1 / UV wavelength tunable laser 1 is selected as the light source in this embodiment. The laser can generate 210-2300nm continuously tunable laser beam.
[0026] 2) Neutral density filter 2: In this embodiment, a Spiricon neutral density filter is selected.
[0027] 3) Aperture hole 3: Daheng Optoelectronics GCM-57 variable aperture is used in this embodiment.
[0028] 4) Beam splitter 4: In this embodiment, a beam splitter with a fixed beam splitting ratio of 1:1 (600-1200 nm) is selected. In other wavelength bands, the splitting ratio will vary, but for a fixed wavelength, the spl...
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The invention discloses a system for testing the diffraction efficiency of an acousto-optic tunable filter (AOTF). The system comprises a wavelength tunable laser, a neutral density filter, a diaphragm orifice, a beam splitting mirror, a two-dimensional electric turnplate and an energy meter. The wavelength tunable laser can generate laser beams with continuously adjustable wavelength, the laser beams after passing through the neutral density filter and the diaphragm orifice are split into two beams of lasers with fixed beam splitting ratio by the beam splitting mirror, and the energy of reflecting beams is used as reference energy; transmission beams enter the AOTF, the energy of diffracted light is received when radio-frequency drive is applied to the transmission beams, and energy withdirect penetration is received when the drive is not applied to the transmission beams, thereby calculating the diffraction efficiency of the AOTF. Meanwhile, the measurement of an aperture angle canbe realized by changing the angle of incident light through the two-dimensional electric turnplate. The device has the characteristics of simple principle and strong operability, can meet the requirement of testing the continuous wavelength of the AOTF and can also enhance the testing accuracy greatly by utilizing reference beams generated by the beam splitting mirror.
Description
Technical field: [0001] The invention relates to optical measurement technology, in particular to an acousto-optic tunable filter diffraction efficiency testing system and method. Background technique: [0002] Acousto-optic tunable filter (AOTF) is a narrow-band tunable filter, which is a spectroscopic device made according to the principle of acousto-optic interaction. Wavelength scanning is achieved by changing the frequency-selective spectral wavelength of the RF drive applied to the crystal. At present, this technology has been widely used in non-imaging and imaging spectroscopic instruments. [0003] The spectroscopic principle of AOTF: as attached figure 1 , attached figure 2 As shown, when a beam of polychromatic light passes through an optically elastic crystal vibrating at a high frequency, the monochromatic light of a certain wavelength will be diffracted inside the crystal, and will be transmitted from the crystal at a certain angle. The color light is direc...
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IPC IPC(8): G01M11/02
Inventor 沈渊婷杨世骥何志平王建宇舒嵘
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI