Title :
Critical slowing down and off-resonant enhancement of avalanche nonlinearities
Author :
Shu, Q. ; Rand, S.C.
Author_Institution :
Div. of Appl. Phys., Michigan Univ., Ann Arbor, MI, USA
Abstract :
We report two-beam coupling measurements of temporal response and intensity-dependent index changes in the avalanche crystal LiYF/sub 4/:Tm(3+). Surprisingly, the induced nonlinear response on the excited state resonance is dominated by a real portion arising from a non-resonant ground state transition. Critical slowing down of excited state dynamics is also predicted and observed.
Keywords :
excited states; lithium compounds; multiwave mixing; optical materials; refractive index; thulium; LiYF/sub 4/:Tm; LiYF/sub 4/:Tm(3+); avalanche crystal; avalanche nonlinearities; excited state dynamics; excited state resonance; induced nonlinear response; intensity-dependent index changes; non-resonant ground state transition; off-resonant enhancement; temporal response; two-beam coupling measurements; Delay effects; Laser excitation; Multilevel systems; Nonlinear optics; Physics; Probes; Refractive index; Resonance; Stationary state; Wavelength measurement;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 1996. QELS '96., Summaries of Papers Presented at the
Conference_Location :
Anaheim, CA, USA
Print_ISBN :
1-55752-444-0
