Er,YB:YAB-Er, Yb Co – Doped Phosphate Glass

(Er,Yb: phosphate glass) combines the long lifetime (~8 ms) of the laser level on 4 I 13/2 Er 3+ with the low (2-3 ms) of the 4 I 11/2 Er 3+ level Lifetime, can generate resonance F 5/2 excited state with Yb 3+ 2 . Fast nonradiative multiphonon relaxation from 4 I 11/2 to 4 I 13/2 due to interactions between Yb 3+ and Er 3+ ions excited at 2 F 5/2 and 4 I 11/2, respectively , this energy level greatly reduces the back energy transfer and up-conversion losses.
Er 3+ , Yb 3+ co-doped yttrium aluminum aluminate borate (Er,Yb:YAB) crystals are commonly used Er,Yb:phosphate glass alternatives and can be used as “eye-safe” active media ( 1,5 -1,6 μm) lasers with high average output power in CW and pulsed modes. It is characterized by high thermal conductivity of 7,7 Wm-1 K-1 and 6 Wm-1 K-1 along the a-axis and c-axis, respectively. Also has high efficiency Yb 3+→Er 3+ energy transfer (~94%) and weak upconversion loss attributed to the very short lifetime (~80 ns) of the 4 I 11/2 excited state due to the host's The maximum phonon energy is high (vmax ~1500 cm-1). A strong and broad absorption band (about 17 nm) was observed at 976 nm, consistent with the emission spectrum of an InGaAs laser diode.