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학술지 Wide Tuning Range Wavelength-Swept Laser with a Single SOA at 1020 nm for Ultrahigh Resolution Fourier-Domain Optical Coherence Tomography
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이상원, 송현우, 정문연, 김승환
Optics Express, v.19 no.22, pp.21227-21237
Optical Society of America(OSA)
11MC2300, 종양치료용 레이저 이온 가속 시스템 원천 기술 개발, 김승환
In this study, we demonstrated a wide tuning range wavelengthswept laser with a single semiconductor optical amplifier (SOA) at 1020 nm for ultrahigh resolution, Fourier-domain optical coherence tomography (UHR, FD-OCT). The wavelength-swept laser was constructed with an external line-cavity based on a Littman configuration. An optical wavelength selection filter consisted of a grating, a telescope, and a polygon scanner. Before constructing the optical wavelength selection filter, we observed that the optical power, the spectrum bandwidth, and the center wavelength of the SOA were affected by the temperature of the thermoelectric (TE) cooler in the SOA mount as well as the applied current. Therefore, to obtain a wide wavelength tuning range, we adjusted the temperature of the TE cooler in the SOA mount. When the temperature in the TE cooler was 9 °C, our swept source had a tuning range of 142 nm and a full-width at half-maximum (FWHM) of 121.5 nm at 18 kHz. The measured instantaneous spectral bandwidth (灌{\\lambda}) is 0.085 nm, which was measured by an optical spectrum analyzer with a resolution bandwidth of 0.06 nm. This value corresponds to an imaging depth of 3.1 mm in air. Additionally, the averaged optical power of our swept source was 8.2 mW. In UHR, FD/SS-OCT using our swept laser, the measured axial resolution was 4.0 μm in air corresponding to 2.9 μm in tissue (n = 1.35). The sensitivity was measured to be 93.1 dB at a depth of 100 μm. Finally, we obtained retinal images (macular and optic disk) and a corneal image. © 2011 Optical Society of America.
KSP 제안 키워드
20 nm, 5 nm, Applied current, Axial Resolution, Center wavelength, Corneal image, Full-width at half-maximum(FWHM), Littman configuration, Optic Disk, Optical Coherence Tomography(OCT), Optical power