Bz. Luo et S. Kroll, OBSERVATION OF A MAGNETIC-FIELD-INDUCED RESONANCE IN THE HOMOGENEOUS DEPHASING TIME FOR THE D-1(2)-H-3(4) TRANSITION IN PR3+YALO3, Physical review. B, Condensed matter, 54(14), 1996, pp. 9834-9839
Using two-pulse photon echo excitation a strong resonance in the measu
red homogeneous dephasing time as a function of magnetic field is obse
rved in the H-3(4)-D-1(2) transition of Pr3+:YAlO3. The resonance coul
d only be observed at low excitation energies since it otherwise was m
asked by excitation intensity dependent extra dephasing processes in t
he crystal. Thus intensity dependent dephasing processes may not only
affect the apparent dephasing time of a system but may also mask other
more subtle interactions in the materials studied. It is reasonable t
o assume that the type of resonance observed could be caused by Zeeman
induced level crossings in the active ion or in the host crystal ions
or, possibly, that it could be due to coincidences between Zeeman lev
el transition frequencies. However, based on current data of the Pr:YA
lO3 system the observed resonance could not be unambiguously tied to s
uch effects.