imaging Bragg Tunable Filter R50
The low resolution module of the BTFi instrument can is already funcional and works with two pairs of gratings. The first of them operates in transmission mode and has the following nominal characteristics.
| Angular sampling | 0.4° | |
| Wavelength sampling | 55A | |
| Spectral Range | 3800A – 6100A | |
| FWHM | 140A |
imaging Bragg Tunable Filter R1500
Finally, the iBTF has also reflection gratings that can be used to achieve the following nominal characteristics:
| Angular sampling | 0.05° | |
| Wavelength sampling | 1.36A | |
| Spectral Range | 6410A – 6980A | |
| FWHM | 3.4A |