Upconversion-pumped IR (2.8-2.9 microns) lasing of Er3+ in garnets

S. A. Pollack; David B. Chang; Milton Birnbaum; Milan R. Kokta

doi:10.1117/12.43596

1 July 1991 Upconversion-pumped IR (2.8-2.9 microns) lasing of Er³⁺ in garnets

S. A. Pollack, David B. Chang, Milton Birnbaum, Milan R. Kokta

Proceedings Volume 1410, Solid State Lasers II; (1991) https://doi.org/10.1117/12.43596
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Optical properties and upconversion-pumped lasing on the ⁴I_11/2 ⁴I_13/2 transition of the Er³⁺ ion were studied in two garnet crystals, (33% Er) Y₃Al₅O₁₂ and (25%) Y₃Sc₂Ga₃O₁₂. The (Er) YSGG crystal was grown at Union Carbide. Absorption and emission spectra of the crystals were studied at 300K, 77K and 4K. Stark-splittings were determined from the 4K absorption spectra for the five lowest excited states. Fluorescence lifetimes for several excited states were measured at 300K and 77K using 355 nm 10 ns Q-switch pulses of tripled Nd:YAG; and 1.53 micrometers pulses of an Er:glass laser. In the latter case, fluorescence was excited via ion-pair upconversion. In (Er)YAG at 300K under UV excitation, the lifetime of the ⁴I_13/2 state is almost two orders of magnitude longer than the lifetime of the ⁴I_13/2 in Er:YSGG. The lifetime of the ⁴I_13/2 state is only a factor of 5 longer than the ⁴I_11/2 state. The upconversion lasing characteristics of Er:YSGG and Er:YAG are described and related to the measured spectral and lifetime measurements.

Citation Download Citation

S. A. Pollack, David B. Chang, Milton Birnbaum, and Milan R. Kokta "Upconversion-pumped IR (2.8-2.9 microns) lasing of Er³⁺ in garnets", Proc. SPIE 1410, Solid State Lasers II, (1 July 1991); https://doi.org/10.1117/12.43596

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