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Mechanisms of energy transfer to $2\mu$ lasing channel in a BaYb$_2$F$_8$:Ho$^{3+}$ crystal
B. M. Antipenko
Abstract:
It was found that when the energy of neodymium laser radiation absorbed in a
$BaYb_2F_8:Ho^{3+}$ (0.5%), crystal reached 1 J/cm
$^3$, the obvious mechanism of population of the
${}^5I_7$ state of the activator involving nonradiative energy transfer from the sensitizer ions $|^2F_{5/2}(Yb),{}^5I_8(Ho)>\!\to|^2F_{7/2}(Yb),{}^5I_6(Ho)>$ followed by the relaxation process
$|{}^5I_6(Ho)>\sim\to|{}^5I_7(Ho)>)$ changed to a cooperative process consisting of three successive stages of step-like sensitization $|^2F_{5/2}(Yb),{}^5I_8(Ho)>\!\to|^2F_{7/2}(Yb),{}^5I_6(Ho)>$;
$|^2F_{5/2}(Yb),{}^5I_6(Ho)>\!\to|^2F_{7/2}(Yb),{}^5S_2(Ho)$;
$|^2F_{5/2}(Yb),{}^5S_2(Ho)>\!\to|^2F_{7/2}(Yb),{}^3H_6(Ho)>$, and two successive stages of intercenter cross relaxation $|^5G_4(Ho),{}^2F_{7/2}(Yb)>\!\to|^5F_5(Ho),{}^2F_{5/2}(Yb)>$; $|^5F_5(Ho),{}^2F_{7/2}(Yb)>\!\to|^5I_7(Ho),{}^2F_{5/2}(Yb)>$. Ways of optimizing the active medium of a laser converter to the
$2\mu$ wavelength were determined for
$BaYb_2F_8:Ho^{3+}$. The feasibility of constructing an anti-Stokes (
$1.06\to0.75\mu$) laser frequency converter was analyzed.
UDC:
621.373:535
PACS:
42.55.Rz Received: 15.04.1980
Revised: 25.08.1980
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