Abstract
The 3d3 ion, Cr3+ is the optical centre in several tunable solid state lasers which operate at room temperature1). The energies of the electronic levels involved in the optical properties of Cr3+ ion vary from crystal to crystal2). We deal with gadolinium scandium gallium garnet (GSGG) and gadolinium scandium aluminum garnet (GSAG). The shapes of the low temperature emission spectra from Cr3+ ions in GSGG and GSAG are rather different. Figure 1 shows the luminescence spectrum of Cr3+ in GSGG. The spectrum is a mixture of the 2Eg → A2g transition, R-line and sharply-structured sideband and the broad band 4T2g → 4A2g emission. The zero-phonon lines at 696.1 nm and 694.9 nm denoted by A and B in Fig. 1b) are due to Cr3+ centres in slight different local environments which affect the electronic level of Cr3+. The periodic structure is assigned to one- and two-phonon sidebands denoted by A1, A2 (B1, B2). The separation between lines A and A1 and between lines A1 and A2 is 178 cm−1. As the temperature increases, the new lines denoted by C and D appear at shorter wavelength as shown in Fig. 1b).
© 1988 Optical Society of America
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