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Figure 4
Schematic view of the optical setup for the TLAS measurements. The emitted laser (DFB) is split into three branches and directed to a Fabry–Perot spectrometer, to a reference cell discharge and to the gas attenuator. The branch directed to the gas attenuator is reduced in intensity and collimated to 0.5 mm diameter; it is also reflected by a movable mirror to obtain spatial scans of the laser absorption. All three branches are terminated by photodiodes (pd1, pd2 and pd3). The X-ray beam crosses the attenuator in the Z direction and is represented by the central red circle. The whole setup is placed around the `measurement position' in Fig. 1[link].

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 6| November 2017| Pages 1195-1208
https://doi.org/10.1107/S1600577517012000
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