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Phase-Coherent Frequency Combs in the Vacuum Ultraviolet via High-Harmonic Generation inside a Femtosecond Enhancement Cavity

机译:通过飞秒增强腔内的高谐波产生在真空紫外中进行相干频率梳

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摘要

We demonstrate the generation of phase-coherent frequency combs in the vacuum utraviolet spectral region. The output from a mode-locked laser is stabilized to a femtosecond enhancement cavity with a gas jet at the intracavity focus. The resulting high-peak power of the intracavity pulse enables efficient high-harmonic generation by utilizing the full repetition rate of the laser. Optical-heterodyne-based measurements reveal that the coherent frequency comb structure of the original laser is fully preserved in the high-harmonic generation process. These results open the door for precision frequency metrology at extreme ultraviolet wavelengths and permit the efficient generation of phase-coherent high-order harmonics using only a standard laser oscillator without active amplification of single pulses.
机译:我们展示了真空紫外光谱区域中相干频率梳的产生。锁模激光器的输出通过腔内焦点处的气体射流稳定到飞秒增强腔。腔内脉冲的最终高峰值功率可通过利用激光器的完整重复频率实现高效的高谐波产生。基于光学外差的测量结果表明,在高谐波产生过程中,原始激光器的相干频率梳状结构得到了充分保留。这些结果为在极端紫外线波长下进行精确频率计量打开了方便之门,并且仅使用标准激光振荡器就可以有效地产生相干高阶谐波,而无需主动放大单个脉冲。

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