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Related Experiment Video

Updated: Jun 28, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Published on: January 15, 2013

Spectrally-sampled OCT for sensitivity improvement from limited optical power.

Eun Joo Jung¹, Jae-Seok Park, Myung Yung Jeong

¹Department of Nanosystem Engineering, Pusan National University, Busan, Korea.

|October 30, 2008

Summary

A novel spectrally sampled multi-wavelength light source improves optical coherence tomography (OCT) sensitivity. This advancement enhances dynamic range by nearly 50% without increasing damaging optical illumination power.

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Area of Science:

Biomedical optics
Optical imaging
Coherence tomography

Background:

High optical illumination power in optical coherence tomography (OCT) improves signal-to-noise ratio but is limited by tissue damage thresholds and autocorrelation signals.
Existing OCT methods face challenges in enhancing sensitivity without escalating optical power.

Purpose of the Study:

To introduce a spectrally sampled multi-wavelength light source for OCT systems.
To improve signal sensitivity and dynamic range in OCT without increasing optical illumination power.

Main Methods:

A fiber Sagnac comb filter was employed to spectrally sample a continuous spectral light source.
The spectrally sampled light source was integrated into an OCT system.
Point spread function analysis was conducted to evaluate system performance.

Main Results:

The spectrally sampled OCT system demonstrated an approximate 50% improvement in dynamic range compared to conventional continuous spectral light source OCT.
This enhancement was achieved at the same average optical power of 6 mW.
The proposed method effectively addresses the limitations of high optical power in OCT.

Conclusions:

A spectrally sampled multi-wavelength light source is a viable strategy for enhancing OCT sensitivity and dynamic range.
This technique offers a method to improve OCT performance while adhering to safety limits for biomedical tissues.