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Fast and compact four-quadrant CEP detection with f-2f polarization interferometry
Optics Express
|August 13, 2025
Summary
We developed a new method, f-2f polarization interferometry, to measure the carrier-envelope phase (φCEP) of light pulses. This technique allows for unambiguous, high-bandwidth measurement of φCEP, crucial for ultrafast experiments.
Area of Science:
- Ultrafast optics
- Nonlinear optics
- Quantum optics
Background:
- Carrier-envelope phase (φCEP) is critical for subcycle light-matter interactions.
- Standard f-2f interferometry measures carrier-envelope offset frequency (fCEO) but struggles with high-bandwidth φCEP measurement.
Purpose of the Study:
- Introduce a novel f-2f polarization interferometry technique.
- Enable unambiguous, high-bandwidth measurement of φCEP.
- Advance ultrafast experimental capabilities.
Main Methods:
- Utilize spectral overlap from a traditional f-2f interferometer.
- Evaluate the polarization state with linear optical components and balanced photodiodes.
- Implement f-2f polarization interferometry for φCEP detection.
Main Results:
- Achieved unambiguous φCEP measurement over a 2π range.
- Demonstrated detection speeds up to 60 kHz.
- Showcased potential for single-shot φCEP detection at MHz rates.
Conclusions:
- f-2f polarization interferometry offers a significant advancement for measuring light pulse φCEP.
- The technique is versatile for applications like φCEP stabilization, phase tagging, and controlling light-matter interactions.
- This method enhances precision in ultrafast experiments.
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