The efficiencies of energy transfer from Cr to Nd ions in silicate glasses

Shintaro Mizuno; Hiroshi Ito; Kazuo Hasegawa; Hiroyuki Nasu; Mark Hughes; Takenobu Suzuki; Yasutake Ohishi

doi:10.1117/12.840822

25 February 2010 The efficiencies of energy transfer from Cr to Nd ions in silicate glasses

Shintaro Mizuno, Hiroshi Ito, Kazuo Hasegawa, Hiroyuki Nasu, Mark Hughes, Takenobu Suzuki, Yasutake Ohishi

Proceedings Volume 7598, Optical Components and Materials VII; 75980A (2010) https://doi.org/10.1117/12.840822
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

The efficiency of energy transfer from Cr to Nd in silicate glasses has been examined in order to develop a gain medium for high-efficiency solar pumped fiber lasers (SPFLs). The internal quantum efficiency (QE) of the emission from the ⁴T₂ state of Cr in Cr-doped glasses and from the ⁴F_3/2 state of Nd in Nd-doped and Nd,Cr codoped glasses was measured using an integrating sphere. For Cr-doped and Nd,Cr codoped glasses, 650 nm excitation was used. For Nd-doped glasses, 808 nm excitation was used. The QE of Cr-doped glass (η_Cr) was 7.5 % for 0.05 mol.% Cr₂O₃, the QE decreased monotonically with increasing Cr₂O₃ content. The QE of the Nd-doped glass (η_Nd) has a maximum of 43% at 0.2 mol.% Nd₂O₃. We suggest that absorption of host glass could lower the QE at the low content side of the maximum. The QE of Nd emission in Nd,Cr codoped glass (η_Nd,Cr) excited at 650 nm, which excites the ⁴A₂→⁴T₂ transition of Cr was 5.7 % for 0.05 mol.% Cr₂O₃ and 0.2 mol.% Nd₂O₃ content. The energy transfer quantum efficiency, η_tr, from Cr to Nd which is defined as the ratio of the η_Cr and the η_Nd,Cr was calculated from the obtained QEs. The largest η_tr was 13.4 % at 0.01 mol.% Cr₂O₃, and decreased with increasing Cr₂O₃ when content of Nd₂O₃ was fixed by 0.2 mol.%. This tendency is quite similar to the QEs of the Cr emission in Cr-doped glasses. Thus an increase in the QE of Cr maybe essential to increase the η_tr.

Citation Download Citation

Shintaro Mizuno, Hiroshi Ito, Kazuo Hasegawa, Hiroyuki Nasu, Mark Hughes, Takenobu Suzuki, and Yasutake Ohishi "The efficiencies of energy transfer from Cr to Nd ions in silicate glasses", Proc. SPIE 7598, Optical Components and Materials VII, 75980A (25 February 2010); https://doi.org/10.1117/12.840822

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