Abstract
In celebrating the seminal paper by McCumber and Sturge on thermal line broadening by one- and two-phonon processes, I briefly revisit the ruby line width question and then investigate the thermal broadening of the 12604.3 cm −1 line of Tm : YAG using optical free induction decay and spectral hole burning. This transition has recently been used in demonstrations of high-density time/frequency domain storage and optical signal processing where thermally induced dephasing is an important issue limiting performance.
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