Ultimate Limit in the Spectral Resolution of Extreme Ultraviolet Frequency Combs

Extreme ultraviolet frequency combs for precision measurement and strong-field physics

Extreme ultraviolet frequency comb metrology.

The remarkable precision of frequency-comb (FC) lasers is transferred to the extreme ultraviolet (XUV, wavelengths shorter than 100 nm), a frequency region previously not accessible to these devices. A frequency comb at XUV wavelengths near 51 nm is generated by amplification and coherent up-conversion of a pair of pulses originating from a near-infrared femtosecond FC laser. The phase coherenc...

Comparative analysis of spectral coherence in microresonator frequency combs.

Microresonator combs exploit parametric oscillation and nonlinear mixing in an ultrahigh-Q cavity. This new comb generator offers unique potential for chip integration and access to high repetition rates. However, time-domain studies reveal an intricate spectral coherence behavior in this type of platform. In particular, coherent, partially coherent or incoherent combs have been observed using ...

Phase-locked, time-delayed harmonic pulses for high spectral resolution in the extreme ultraviolet.

We present experiments in the time and frequency domains aimed at confirming the measured mutual phase coherence of time-delayed, collinear harmonic pulses. We show that pairs of phase-locked harmonic pulses of medium order can be generated for peak intensities up to ~1.5 10(14)W/cm(2) in xenon, demonstrating the possibility of performing high-resolution spectroscopy in the extreme ultraviolet ...

Phase-locked, time-delayed, harmonic pulses for high spectral resolution in the extreme ultraviolet: errata.