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Proceedings Paper

All-semiconductor high-speed akinetic swept-source for OCT
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Paper Abstract

A novel swept-wavelength laser for optical coherence tomography (OCT) using a monolithic semiconductor device with no moving parts is presented. The laser is a Vernier-Tuned Distributed Bragg Reflector (VT-DBR) structure exhibiting a single longitudinal mode. All-electronic wavelength tuning is achieved at a 200 kHz sweep repetition rate, 20 mW output power, over 100 nm sweep width and coherence length longer than 40 mm. OCT point-spread functions with 45- 55 dB dynamic range are demonstrated; lasers at 1550 nm, and now 1310 nm, have been developed. Because the laser's long-term tuning stability allows for electronic sample trigger generation at equal k-space intervals (electronic k-clock), the laser does not need an external optical k-clock for measurement interferometer sampling. The non-resonant, allelectronic tuning allows for continuously adjustable sweep repetition rates from mHz to 100s of kHz. Repetition rate duty cycles are continuously adjustable from single-trigger sweeps to over 99% duty cycle. The source includes a monolithically integrated power leveling feature allowing flat or Gaussian power vs. wavelength profiles. Laser fabrication is based on reliable semiconductor wafer-scale processes, leading to low and rapidly decreasing cost of manufacture.

Paper Details

Date Published: 29 November 2011
PDF: 10 pages
Proc. SPIE 8311, Optical Sensors and Biophotonics III, 831116 (29 November 2011); doi: 10.1117/12.912119
Show Author Affiliations
Michael P. Minneman, Insight Photonic Devices, Inc. (United States)
Jason Ensher, Insight Photonic Devices, Inc. (United States)
Michael Crawford, Insight Photonic Devices, Inc. (United States)
Dennis Derickson, California Polytechnic State Univ. (United States)

Published in SPIE Proceedings Vol. 8311:
Optical Sensors and Biophotonics III
Jürgen Popp, Editor(s)

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