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首页> 外文期刊>Optics Letters >Optical clockwork with an offset-free difference-frequency comb: accuracy of sum- and difference-frequency generation
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Optical clockwork with an offset-free difference-frequency comb: accuracy of sum- and difference-frequency generation

机译：带有无偏移差频梳的光学钟表：和频和差频生成的准确性

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摘要

We demonstrate a simple optical clockwork mechanism based on the broadened frequency comb of a femtosecond laser and on difference-frequency generation (DFG) in a nonlinear crystal. The DFG comb possesses a vanishing carrier envelope offset frequency that permits the construction of a simple and thus potentially more stable optical clockwork. In addition it offers the possibility of extending the frequency comb into the infrared spectral region. The overall accuracy and stability of the DFG comb relative to the initial frequency comb were measured to be 6.6×10~(-21) and 10~(-18) τ~(-1), respectively, where τ is the averaging time in seconds. Assuming that sum- and difference-frequency generation are independent processes, our measurements suggest a<10~(-20) accuracy for them.
机译：我们演示了一个简单的光学发条机制，该机制基于飞秒激光器的增宽频率梳和非线性晶体中的差频生成（DFG）。 DFG梳具有消失的载波包络偏移频率，允许构建简单的因而可能更稳定的光学钟表。另外，它提供了将频率梳扩展到红外光谱区域的可能性。相对于初始频率梳，DFG梳的整体精度和稳定性测得分别为6.6×10〜（-21）和10〜（-18）τ〜（-1），其中τ为平均时间秒。假设和频和差频的产生是独立的过程，我们的测量表明它们的准确度<10〜（-20）。

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