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Narrow-line InGaN/GaN green laser diode with high-order distributed-feedback surface grating
摘要： We demonstrate narrow-line green laser emission at 513.85 nm with a linewidth of 31 pm and side-mode suppression ratio of 36.9 dB, operating under continuous-wave injection at room temperature. A high-order (40th) distributed-feedback surface grating fabricated on multimode InGaN-based green laser diodes via a focused ion beam produces resolution-limited, single-mode lasing with an optical power of 14 mW, lasing threshold of 7.27 kA cm?2, and maximum slope efficiency of 0.32 W A?1. Our realization of narrow-line green laser diodes opens a pathway toward efficient optical communications, sensing, and atomic clocks.
关键词： InGaN/GaN,green laser diode,distributed-feedback,narrow-line,surface grating
更新于2025-11-28 14:23:57
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Optical and Gamma-Ray Variability of the vRL NLSy1 Galaxy, 1H 0323+342
摘要： 1H 0323+342 was one of the ?rst vRLNLSy1 galaxies detected at gamma-rays with the Fermi-LAT and is one of the brightest of this class observed at optical wavelengths. We report the results of monitoring the optical ?ux, polarization and the gamma-ray ?ux of 1H 0323+342 during the past ~5 years. In some cases, the optical ?ux has been monitored on timescales as short as ~minutes simultaneously with two telescopes, demonstrating, for the ?rst time, the reality of microvariability events with durations as short as ~15 min for this object.
关键词： gamma-ray source,blazar,narrow line seyfert 1 galaxy
更新于2025-09-09 09:28:46