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High-speed phase- and group-delay scanning with a grating-based phase control delay line.

G J Tearney, B E Bouma, J G Fujimoto

|January 12, 2008

Summary

A novel phase-controlled optical delay line offers high speed and accuracy for interferometric ranging. This technology enhances applications like optical coherence tomography, improving performance with its unique phase control capabilities.

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Area of Science:

Optics and Photonics
Biomedical Engineering
Metrology

Background:

Existing optical delay methods for interferometric ranging face limitations in speed and duty cycle.
Phase and group delay independence and dispersion compensation are crucial for advanced optical ranging.

Purpose of the Study:

To introduce and analyze a rapid-scanning optical delay line utilizing phase control.
To demonstrate its advantages over conventional optical delay techniques for interferometric applications.

Main Methods:

Development of a grating-based phase-control delay line.
Integration into interferometric optical ranging systems.
Testing with techniques like optical coherence domain reflectometry and optical coherence tomography.

Main Results:

Achieved optical ranging over an axial range of 3 mm.
Demonstrated a high scanning rate of 6 m/s and a repetition rate of 2 kHz.
Confirmed phase- and group-delay independence and group-velocity dispersion compensation.

Conclusions:

The phase-control delay line offers significant advantages in speed, duty cycle, and performance for optical ranging.
It is particularly well-suited for high-speed, repetitive scanning applications like optical coherence tomography.