Improvement of coherence length in a 200-kHz swept light source equipped with a KTN deflector

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

doi:10.1117/12.908210

Improvement of coherence length in a 200-kHz swept light source equipped with a KTN deflector

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

11 Citations (Scopus)

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.

Original language	English
Title of host publication	Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI
Publisher	SPIE
ISBN (Print)	9780819488565
DOIs	https://doi.org/10.1117/12.908210
Publication status	Published - 2012
Externally published	Yes
Event	Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI - San Francisco, CA, United States Duration: Jan 23 2012 → Jan 25 2012

Publication series

Name	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume	8213
ISSN (Print)	1605-7422

Other

Other	Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI
Country/Territory	United States
City	San Francisco, CA
Period	1/23/12 → 1/25/12

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Radiology Nuclear Medicine and imaging
Biomaterials

Access to Document

10.1117/12.908210

Cite this

Yagi, S., Naganuma, K., Imai, T., Shibata, Y., Miyazu, J., Ueno, M., Okabe, Y., Sasaki, Y., Fujiura, K., Sasaura, M., Kato, K., Ohmi, M., & Haruna, M. (2012). Improvement of coherence length in a 200-kHz swept light source equipped with a KTN deflector. In Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI Article 821333 (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 8213). SPIE. https://doi.org/10.1117/12.908210

Improvement of coherence length in a 200-kHz swept light source equipped with a KTN deflector. / Yagi, Shogo; Naganuma, Kazunori; Imai, Tadayuki et al.
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI. SPIE, 2012. 821333 (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 8213).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Yagi, S, Naganuma, K, Imai, T, Shibata, Y, Miyazu, J, Ueno, M, Okabe, Y, Sasaki, Y, Fujiura, K, Sasaura, M, Kato, K, Ohmi, M & Haruna, M 2012, Improvement of coherence length in a 200-kHz swept light source equipped with a KTN deflector. in Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI., 821333, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 8213, SPIE, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI, San Francisco, CA, United States, 1/23/12. https://doi.org/10.1117/12.908210

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AU - Miyazu, Jun

AU - Ueno, Masahiro

AU - Okabe, Yuuichi

AU - Sasaki, Yuzo

AU - Fujiura, Kazuo

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AB - 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.

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Improvement of coherence length in a 200-kHz swept light source equipped with a KTN deflector

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