Imaging spectrometer on the basis of etched diffraction grating
An imaging spectrometer and diffraction grating technology, which is applied in the field of imaging spectrometers, can solve problems such as the scheme design of integrated planar optical waveguide devices that are not used in remote sensing imaging, and achieve the effects of strong system function expansion, enhanced stability, and reduced weight and volume.
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[0063] Example 1:
[0064] Such as image 3 It is a schematic diagram of the first embodiment of the present invention. The imaging system 1 images the ground detection area to a slit, and is limited by the slit to obtain a column of light corresponding to 128 pixels that is coupled into the input waveguide array of the chip, and the coupling loss can be controlled Within 1dB. By controlling the tunable optical attenuator array on the input waveguide, the light intensity signals of the 128 output waveguide arrays corresponding to each input channel can be read sequentially, that is, the spectral information of each spatial point.
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[0065] Example 2:
[0066] For the second embodiment, the imaging system is limited by the slit to obtain a column of images corresponding to 128 pixels. The obtained image passes through the optical switch array 10 composed of 128 micromirrors and then is focused to the taper coupling structure shown in 4 through the cylindrical mirror in the direction perpendicular to the chip plane, and finally leads the light into 128 such as Figure 5 Large cross-section SOI waveguide shown. By controlling the micromirror light switch to turn on the switches of different pixels in turn, only the waveguide corresponding to this pixel has light entering and being split.
[0067] When the imaging spectrometer requires a higher spatial resolution, which results in a row of push-broom imaging that requires more pixels to work, such as a row of 1024 pixels, the two embodiments of the present invention can be extended to 8 above-mentioned spectroscopic systems Evenly distributed on the chip in an ar...
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