Sensitization effect of Nd3+ ions on Yb3+/Nd3+ co-doped oxyfluoride glasses and study of their optical,fluorescence, and upconversion abilities for visible laser and NIR amplifier applications |
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Affiliation: | 1. Department of Physics, Chungnam National University, 99Daehak-ro, Yuseong-gu, Daejeon, 34134, South Korea;2. Department of Physics, Sri Venkateswara University, Tirupati, 517 502, India;3. Department of Physics, Government Degree College, Rayachoty, 516269, India;4. Institute of Quantum Systems (IQS), Chungnam National University, 99Daehak-ro, Yuseong-gu, Daejeon, 34134, South Korea |
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Abstract: | The development of laser technology has created intense demand for optical confinement materials with high performance. Herein the authors have been investigated Yb3+-singly doped and Yb3+/Nd3+-codoped SiO2-based oxyfluoride glasses in terms of their optical absorption, and their near-infrared (NIR) and up-conversion (UC) emissions including emission decay profiles. Under 808 nm laser diode (LD) excitation, four NIR emission bands were observed i.e., (Nd3+: 4F3/2 → 4I9/2, Yb3+: 2F5/2 → 2F7/2, Nd3+: 4F3/2 → 4I11/2, and Nd3+: 4F3/2 → 4I13/2) in co-doped glasses. NIR emission cross-sections [(σemi) stimulated, (σMemi) from Mc-cumber theory] were calculated for 2F5/2 → 2F7/2 (~1030 nm) transition of Yb3+ ion. σemi was found to be highest (26.27 × 10?21 cm2) for the Yb3+: 2F5/2 → 2F7/2 transition in N2 glass. UC emission spectra recorded at 980 nm LD show bands centered at 500, 536, 595 & 610, and 664 nm, attributed to 4G9/2 → 4I9/2, 4G7/2 → 4I9/2& 4G7/2 → 4I11/2, 4G5/2 → 4I9/2, and 4G9/2 → 4I13/2 transitions, respectively. Decay profiles were analyzed for Yb3+: 2F5/2 → 2F7/2 (~1030 nm) and Nd3+: 4F3/2 → 4I11/2 (~1057 nm) transitions at 808 nm LD. Energy transfer (ET) process from Nd3+ to Yb3+ in present glasses were detailed. |
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Keywords: | Oxyfluoride glasses NIR fluorescence Energy transfer Gain cross-section Upconversion |
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