Advances in Yb:Fiber Frequency Comb Technology

Axel Ruehl

Femtosecond-laser frequency combs revolutionized the field of precision metrology after their introduction in 1999. Today, they are commonly used in atomic clock calibration, low-noise frequency synthesis, astronomical spectrograph calibration and precision spectroscopy. Scientists are now pushing to extend frequency combs into the mid-infrared and extreme ultraviolet spectral region with Yb:fiber technology.


feature4-img1.jpgArtist’s impression of an extreme ultraviolet (XUV) frequency comb, which creates attosecond pulse bursts at XUV wavelengths. Each of the resulting harmonics has its own set of “teeth,” creating a frequency comb within each harmonic.

The Ye group and Brad Baxley, JILA

A frequency comb is a visual model of a mode-locked laser spectrum generated from a series of femtosecond (fs) pulses. A train of pulses from a mode-locked laser produces a spectrum with a series of sharp spectral lines, each at a specific frequency, that resemble the teeth of a comb. The combs typically operate in the near-infrared and visible spectrum. However, various spectroscopic applications rely on combs that cover the extreme ultraviolet (XUV) as well as the mid-infrared (MIR) spectral region, enabled by high-power sources to drive nonlinear conversion schemes.

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