Abstract

We describe the fundamental characteristics of a synthesized light source (SLS) consisting of two low-coherence light sources to enhance the spatial resolution for optical coherence tomography (OCT). The axial resolution of OCT is given by half the coherence length of the light source. We fabricated a SLS with a coherence length of 2.3 µm and a side-lobe intensity of 45% with an intensity ratio of LED1:LED2 = 1:0.5 by combining two light sources, LED1, with a central wavelength of 691 nm and a spectral bandwidth of 99 nm, and LED2, with a central wavelength of 882 nm and a spectral bandwidth of 76 nm. The coherence length of 2.3 µm was 56% of the shorter coherence length in the two LEDs, which indicates that the axial resolution is 1.2 µm. The lateral resolution was measured at less than 4.4 µm by use of the phase-shift method and with a test pattern as a sample. The measured rough surfaces of a coin are illustrated and discussed.

© 2005 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Application of the maximum entropy method to spectral-domain optical coherence tomography for enhancing axial resolution

Yoshiyuki Takahashi, Yuuki Watanabe, and Manabu Sato
Appl. Opt. 46(22) 5228-5236 (2007)

Imaging characteristics of an 8.8  mm long and 125  μm thick graded-index short multimode fiber probe

Manabu Sato, Kou Shouji, Daisuke Saito, and Izumi Nishidate
Appl. Opt. 55(12) 3297-3305 (2016)

A dual-modal retinal imaging system with adaptive optics

Alexander Meadway, Christopher A. Girkin, and Yuhua Zhang
Opt. Express 21(24) 29792-29807 (2013)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (15)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (8)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription