Revisiting the temperature dependence of the homogeneous R1 linewidth in ruby

Homogeneous line broadening of the ruby R1 line due to the superhyperfine interactions

High resolution measurements of the ruby R1 line at low temperatures

Temperature dependence of the homogeneous optical linewidth of impurities in glasses

Multiple Quantum Transitions and Simultaneous Laser Action of R1 and R2 Lines in Ruby

Thermal shift of fluorescent light R1 in ruby below 80K

Temperature dependence of self-induced transparency in ruby