Phase-predictable tuning of single-frequency optical synthesizers

Area of Science:

• Optical physics
• Frequency metrology
• Laser engineering

Background:

• Single-frequency optical synthesizers are crucial for precision measurements.
• Existing synthesizers often require complex comb line order switching for broad tuning.
• Novel approaches are needed to improve tuning stability and range.

Purpose of the Study:

• To investigate the tuning behavior of a new type of single-frequency optical synthesizer.
• To demonstrate phase-stable and cycle-slip-free frequency tuning.
• To assess the necessity of comb line order switching during tuning.

Main Methods:

• Phase comparison of output signals from two identical novel optical synthesizers.
• Characterization of frequency tuning stability and phase deviation.
• Evaluation of tuning range without comb line order switching.

Main Results:

• Achieved phase-stable and cycle-slip-free frequency tuning over a 28.1 GHz range.
• Observed a maximum zero-to-peak phase deviation of 62 mrad.
• Demonstrated successful tuning across multiple comb line spacing ranges without comb line order switching.

Conclusions:

• The novel single-frequency optical synthesizer exhibits robust tuning capabilities.
• Elimination of comb line order switching simplifies operation and broadens tuning.
• This advancement offers improved performance for optical frequency synthesis applications.