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This research demonstrates effective sodium D2 light generation in spectroscopy, suggesting advancements for lidar technology.
The sodium D2 resonance light was generated in sum-frequency generation pumped with two continuous-wave distributed-feedback lasers. The output power reached 11 mW at a wavelength near the sodium D2 line with a high conversion efficiency in a fiber-coupled periodically poled LiNbO3 waveguide. Three dominant spectra, the D2-a, the D2-b, and the crossover resonance, were clearly observed in Doppler-free saturation spectroscopy by high-rate scanning the sum frequency at around the D2 resonance line with a linewidth of ≈ 3 MHz.
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Saito et al. (2026) studied this question.
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