Neodymium-doped yttria is investigated as a solid-state laser material for frequency-tripled generation of ultraviolet laser wavelengths for use in remote sensing of ozone. Emphasis is placed both on the spectroscopy of the fundamental wavelengths at ∼0.914 µm and ∼0.946 µm to assess their feasibility for laser oscillation and on the absorption spectroscopy in the 0.8-µm wavelength region for determination of suitable pump sources. The temperature dependence of the emission and absorption characteristics of are examined, since aggressive cooling may be required for efficient ∼0.914-µm lasing due to its quasi four-level nature. Data for flash-lamp-pumped laser performance on the is presented for and compared with Nd:YAG. Diode-pumped threshold-fluence and threshold-pump energy estimates for lasing on the at 0.914 µm and 0.946 µm are calculated based on the data presented here. The measurements presented here for the indicate favorable absorption and emission properties. Favorable absorption properties in the ∼0.8-µm pump wavelength are compatible with a variety of potential pump sources. Favorable emission properties at reduced temperatures near 150 K indicate that operating at 0.914 µm and 0.946 µm will have normal-mode laser thresholds similar to that of room-temperature Nd:YAG operating at 0.946 µm. In Q-switched operation, however, is predicted to exceed the performance of Nd:YAG due to the lower 1.06/0.94 cross-section ratio, which helps to limit amplified spontaneous-emission effects. Although is not a new material, it has not been the topic of study due to growth problems associated with its high melting point. New advances in growth techniques and the favorable spectroscopic features of have inspired a new examination of this material.
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