Fully stabilized 750-MHz Yb: fiber frequency comb

Area of Science:

• Optics and Photonics
• Atomic, Molecular, and Chemical Physics

Background:

• Fiber frequency combs are essential tools for high-precision spectroscopy and metrology.
• Stabilizing high-repetition-rate combs presents unique challenges for carrier-envelope offset frequency control.

Purpose of the Study:

• To demonstrate a fully stabilized, self-referenced Ytterbium (Yb):fiber frequency comb.
• To achieve a high fundamental repetition rate of 750 MHz without external amplification or compression.
• To investigate methods for phase locking the carrier-envelope offset frequency (f_ceo).

Main Methods:

• Phase locking the Yb:fiber frequency comb to both a microwave standard and an optical reference.
• Implementing a 750-MHz repetition rate directly from the fiber laser.
• Investigating two distinct schemes for f_ceo stabilization: f-2f self-referencing and beat note locking to a continuous wave laser.

Main Results:

• Successful demonstration of a fully stabilized, self-referenced Yb:fiber frequency comb operating at 750 MHz.
• Achieved phase locking without the need for external amplifiers or compressors.
• Comparative analysis of two f_ceo stabilization techniques for high-repetition-rate combs.

Conclusions:

• The presented 750-MHz Yb:fiber frequency comb is a robust platform for precision measurements.
• Both investigated f_ceo stabilization methods are viable for high-repetition-rate fiber combs.
• This work advances the development of compact and high-performance optical frequency standards.