Abstract
We have investigated the dynamics of 29cm−1 phonons in ruby by direct optical excitation of the 2A(2E) (R2) level. A dye laser (tp = 6ns) generates a column (r = 25 µm) of excited ions and the phonons are detected by a superconducting bolometer, identifying the resonant phonons by their scattering in an additional volume created by an argon laser (inset in fig. (1) or by the luminescence from the E(2E) (R1) level. We find no strong laser-like nonlinearities as reported by Hu[1], but observe that phonon bottleneck is suppressed for the first 50 ns after the excitation, so that about 70% of the phonons escape from the excited region before strong bottleneck (b >=100) sets in [2]. This has been explained qualitatively by “incoherent bleaching” of the acoustically thick medium due to the high phonon occupation numbers (p up to 100) following the excitation.KeywordsArgon LaserSpectral DiffusionExcited RegionThick MediumStrong BottleneckThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
