Development of soft X-ray excited optical luminescence (XEOL) measurement setup at beamline 4 in INDUS-1 synchrotron radiation source.

We developed an experimental setup for the measurement of soft X-ray excited optical luminescence at the reflectivity beamline (BL-4), Indus-1 synchrotron radiation source. The soft X-ray excited visible luminescence signal from sample was collected using a lens assembly and focused on to a ∼200 µm optical fiber coupled to thermoelectric (TE) cooled spectrometer. The photo luminescence signal from the samples mounted inside a vacuum chamber was brought to the luminescence collection unit mounted in the air through a glass view port. The toroidal grating monochromator of the beamline provided the soft x-rays for excitations in the range of ∼10 eV to 300 eV (100 nm – 4 nm) and the resultant optical luminescence was recorded in the range of ∼350 nm to 900 nm. The developed setup was demonstrated by the recording the visible emission from standard scintillator materials (Cr:Al₂O₃, Ce:YAG, etc.) and β-Ga₂O₃ nanostructure. [ABSTRACT FROM AUTHOR]