Direct optical excitation into excited states of Cr3+ pairs in ruby

Fine Structure Constant at V-Band Region of Cr3+ in Ruby Crystal

Transient optically detected ESR in the excited state of ruby

Coherent-incoherent energy transfer in ruby and Cr3+ : LaAlO3

Measurement of g⊥ of Optically Excited State \barE (2E) of Cr3+ in Al2O3

Stimulated emission of phonons in optically excited ruby (A)

Spectroscopy of the 2E excited state of Cr3+ in alexandrite