Swept Source OCT System
Chapter 2: System Description
Rev H, June 3, 2011
Page 12
2.4.2. Swept Source OCT Engine and Imaging Module
SSOCT applications require a laser that can be swept over a broad wavelength range with very high speed. The
broad wavelength tuning range is required for obtaining high image resolution while the high tuning speed is
needed for video rate imaging speeds higher than 20 fps.
Thorlabs' Swept Source Laser is specifically designed for SSOCT applications. The 1300 nm laser sweeps across
at least 100 nm at a 16 kHz repetition rate, offers a coherence length of 6 mm, and delivers more than 10 mW of
average optical power out of an SMF28 single mode fiber. The Swept Source Engine is based on a patented
external cavity laser diode design.
The Imaging Module serves as an electro-optical interface between the Swept Source Engine, Imaging Probe,
and the host computer. It contains the galvanometer control circuits as well as additional optical elements needed
for OCT image processing. It is also the control point for the vi
sible “aiming” laser that is combined with the swept
source output to allow the user to see the actual sampling area at the Imaging Probe output.
Figure 3
Imaging Module and Swept Source Engine
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