Speaker
Description
We present a home-built Czerny-Turner triple-grating spectrometer with a focal length of 1.5m and a basic of-the-shelf astronomy camera. This spectrometer offers high spectral resolution and good light sensitivity at a relatively low cost compared to commercially available systems with similarly large focal length.
The three gratings are mounted on a turret and can be swapped without recalibrating the system, which allows the user to quickly change the span and resolution of the observed spectrum. A distinct feature, generally not available in commercial spectrometers, is implemented by having two separate axes of rotation -- one for the turret rotation to change between gratings and one to control the angle of the grating in use. Unlike triple-grating systems with a single rotation axis, this feature enables the grating in use to rotate around an axis that passes along the grating's front surface. This allows the grating to remain in the mirrors' focal points as its angle is adjusted and also extends the range of wavelengths over which a given grating can be used. We compare Zemax simulations predicting resolution <10GHz at 852nm with experimental data to evaluate the performance of the spectrometer.
