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Proceedings Paper

Improvement of coherence length in a 200-kHz swept light source equipped with a KTN deflector
Author(s): Shogo Yagi; Kazunori Naganuma; Tadayuki Imai; Yasuo Shibata; Jun Miyazu; Masahiro Ueno; Yuuichi Okabe; Yuzo Sasaki; Kazuo Fujiura; Masahiro Sasaura; Kazutoshi Kato; Masato Ohmi; Masamitsu Haruna
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Paper Abstract

We are developing a new light source for swept-source OCT, namely, an external-cavity LD equipped with a KTN electro-optic deflector. Being free from mechanical resonance, our 1.3-μm laser exhibits scanning range of almost 100 nm up to 200-kHz under a ±300 V deflector driving voltage. Using a semi-empirically derived equation, we find that KTN's convex lens power degrades the coherence length, and this can be compensated with a cylindrical concave lens. Such compensation was experimentally confirmed by observing reduction of elliptical beam divergence. OCT images of a human fingernail are obtained using the swept source.

Paper Details

Date Published: 30 January 2012
PDF: 6 pages
Proc. SPIE 8213, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI, 821333 (30 January 2012); doi: 10.1117/12.908210
Show Author Affiliations
Shogo Yagi, NTT Photonics Labs. (Japan)
Kazunori Naganuma, NTT Advanced Technology Corp. (Japan)
Tadayuki Imai, NTT Photonics Labs. (Japan)
Yasuo Shibata, NTT Photonics Labs. (Japan)
Jun Miyazu, NTT Photonics Labs. (Japan)
Masahiro Ueno, NTT Photonics Labs. (Japan)
Yuuichi Okabe, NTT Photonics Labs. (Japan)
Yuzo Sasaki, NTT Advanced Technology Corp. (Japan)
Kazuo Fujiura, NTT Advanced Technology Corp. (Japan)
Masahiro Sasaura, NTT Photonics Labs. (Japan)
Kazutoshi Kato, NTT Photonics Labs. (Japan)
Masato Ohmi, Osaka Univ. (Japan)
Masamitsu Haruna, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 8213:
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI
Joseph A. Izatt; James G. Fujimoto; Valery V. Tuchin, Editor(s)

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