TY - GEN
T1 - A mechanical-free 150-kHz repetition swept light source incorporated a KTN electro-optic deflector
AU - Yagi, Shogo
AU - Naganuma, Kazunori
AU - Imai, Tadayuki
AU - Shibata, Yasuo
AU - Ishibashi, Shigeo
AU - Sasaki, Yuzo
AU - Sasaura, Masahiro
AU - Fujiura, Kazuo
AU - Kato, Kazutoshi
PY - 2011
Y1 - 2011
N2 - We present a new light source for the swept-source OCT, that is, an external-cavity LD incorporating an electro-optic deflector. We use a KTN deflector that is unique in being very fast and simultaneously providing an appreciable deflection caused by injected carriers. Particularly, high-speed and nearly linear to the applied voltage operation is attained when KTN crystal is pre-charged. Our 1.3-μm Littman-Metcalf external-cavity laser exhibits static linewidth < 0.1 nm, and a 110-nm scanning range up to 150-kHz under a ±200 V sinusoidal driving voltage to the deflector. Being free of mechanical resonance, the laser would hopefully realize a faster (in a separate study, deflector itself worked up to 400 kHz) and wavenumber-linear scan that is ideal for the swept-source OCT by designing the waveform of driving voltage. And as for the resolving power of deflector, while our KTN deflector has only 35 spatial resolvable points, the number of wavelength points for the swept source clearly exceeds to this limit, which we attribute to line narrowing effect accompanied by the laser operation. Preliminary OCT images taken using the swept source are also presented.
AB - We present a new light source for the swept-source OCT, that is, an external-cavity LD incorporating an electro-optic deflector. We use a KTN deflector that is unique in being very fast and simultaneously providing an appreciable deflection caused by injected carriers. Particularly, high-speed and nearly linear to the applied voltage operation is attained when KTN crystal is pre-charged. Our 1.3-μm Littman-Metcalf external-cavity laser exhibits static linewidth < 0.1 nm, and a 110-nm scanning range up to 150-kHz under a ±200 V sinusoidal driving voltage to the deflector. Being free of mechanical resonance, the laser would hopefully realize a faster (in a separate study, deflector itself worked up to 400 kHz) and wavenumber-linear scan that is ideal for the swept-source OCT by designing the waveform of driving voltage. And as for the resolving power of deflector, while our KTN deflector has only 35 spatial resolvable points, the number of wavelength points for the swept source clearly exceeds to this limit, which we attribute to line narrowing effect accompanied by the laser operation. Preliminary OCT images taken using the swept source are also presented.
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U2 - 10.1117/12.876024
DO - 10.1117/12.876024
M3 - Conference contribution
AN - SCOPUS:79953737769
SN - 9780819484260
T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE
BT - Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV
T2 - Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV
Y2 - 24 January 2011 through 26 January 2011
ER -