Radiative Transitions and Optical Behaviors in Tm3+ Doped Mixed Alkali/Alkaline-Earth Modified Heavy-Metal Gallate Glasses
Efficient ~1.48 and ~1.8mm infrared emissions have been recorded in Tm3+ doped mixed alkali/alkaline-earth modified heavy-metal gallate glasses (LKBPBG) with low phonon energy under 793nm excitation. Judd-Ofelt parameters W2 (4.34´10-20cm2), W4 (9.74´10-21cm2) and W6 (1.00´10-20cm2) indicate a higher asymmetric and stronger covalent environment in the glass material. The spontaneous transition probability and maximum emission cross-section of 3H4→3F4 transition are derived to be 283s-1 and 2.90´10-21cm2. The maximum emission cross-section of 3F4→3H6 transition is calculated to be 6.82´10-21cm2, and the ideal net gain coefficients at 1.675 (U-band edge) and 1.872mm are given to be 0.56 and 3.51dB/cm, respectively, as the population inversion equals 1.0, which provide a theoretical anticipation in developing U-band amplifiers and eye-safe medical lasers.
Yuhang Yang, Xilong Qu, Yiping Luo and Aimin Yang
X. Zhao et al., "Radiative Transitions and Optical Behaviors in Tm3+ Doped Mixed Alkali/Alkaline-Earth Modified Heavy-Metal Gallate Glasses", Advanced Materials Research, Vol. 216, pp. 787-792, 2011