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Ultralow noise and supermode suppression in an actively mode-locked external-cavity semiconductor diode ring laser

机译:有源锁模外腔半导体二极管环形激光器中的超低噪声和超模抑制

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We report what is to our knowledge the lowest phase and amplitude noise characteristics achieved to date in a 10-GHz pulse train produced by the active harmonic mode locking of an external-cavity semiconductor diode laser. Supermode noise has also been suppressed below 140 dBe/Hz by use of a high-finesse fiber Fabry-Perot etalon as an intracavity filter. Novel noise sideband measurements that extend to the Nyquist offset frequency suggest a significant advantage in using harmonic (rather than fundamental) mode locking to produce ultralow-noise pulse trains, owing to the relationship between the noise roll-off frequency and the fundamental cavity frequency.
机译:我们所报告的知识是迄今为止由外腔半导体二极管激光器的有源谐波模式锁定产生的10 GHz脉冲序列中实现的最低相位和幅度噪声特性。通过使用高品质光纤Fabry-Perot标准具作为腔内滤波器,还可将超模噪声抑制在140 dBe / Hz以下。由于噪声滚降频率与基波腔频率之间的关系,扩展到奈奎斯特偏移频率的新型噪声边带测量结果表明,在使用谐波(而非基波)锁模方式来产生超低噪声脉冲序列方面具有显着优势。

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