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Image Caption: Light from the burning candle falls on the Volume-Phase Holographic Grating in this image taken with a 35-mm
camera. The candlelight is spread into its component colors. This particular grating actually contains two gratings in a single element,
something that is impossible to do with classical gratings. Note that there are two spectra visible in the image. A slight tilt between the
two gratings allows the two spectra to be imaged separately onto the detector of the spectrograph. This technology allows for the
simultaneous observation of different wavelength regions at higher efficiency, less cost, and greater durability than conventional
grating technology.
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