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Experimental study demonstrates a 1762 nm single-frequency fiber laser using thulium-doped germanate glass, suggesting a compact optical source for barium ion quantum computing.
A diode-pumped single-longitudinal-mode distributed Bragg reflector fiber laser operating at 1762 nm, corresponding to the electric quadrupole (E2) transition of barium ions, is demonstrated using a 2.5-cm-long 4 wt. % thulium (Tm3+)-doped germanate fiber. With the maximum available pump power of 270 mW at 793 nm, an output power of 7.24 mW was obtained with a slope efficiency of 21.7% with respect to the absorbed pump power without any active temperature control. Single-longitudinal-mode operation was verified using a scanning Fabry–Pérot interferometer. This compact single-longitudinal-mode fiber laser source represents a promising robust and reliable candidate for laser cooling and quantum computing applications, particularly for quantum systems based on barium ion traps.
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AlYahyaei et al. (2026) studied this question.
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