X-ray-excited optical luminescence of GGG: Nd 3+ and LaF 3:Nd 3+ — The first experiments on BEPC beam line 4B9A

Abstract

Beam line 4B9A, which collects and focuses 5.5 mrad of synchrotron radiation from a bending magnet port on the Beijing Electron-Positron Collider (BEPC), has been commissioned and has been operating with the BEPC storage ring at 1.6 GeV in parasitic mode and 2.2 GeV in dedicated mode since April 1989. This paper reports the first measurement of the absorption spectra of GGG:Nd 3+ (Gd 3Ga 5O 13:Nd 3+) in the short wavelength region by use of focussed synchrotron radiation on the 4B9A-VUV branch beam line. The upper Stark levels have been assigned from the absorption spectra. On the 4B9A-WX branch, the first XEOL of GGG:Nd 3+ and LaF 3:Nd 3+ has been observed using X-rays focused by a 0.5° glancing incidence angle bent cylindrical mirror.