High Power and High Resolution Near-Infrared Light Source for Optical Coherence Tomography Using Glass Phosphor and Light Emitting Diode

Abstract

We have fabricated a novel near-infrared light source for optical coherence tomography (OCT) using a glass phosphor and a light emitting diode (LED) as the excitation source. We used 1.glass as the phosphor to obtain wideband light emission around 1000 nm. We observed a full-width at half-maximum (FWHM) as wide as 98 nm with an output power as high as 1 mW. The interference signal showed a coherence length of 4.6 m. This value indicates that the depth resolution of the OCT is twice as high as that of conventional LEDs and super luminescent diodes (SLDs). #

Local Structure Study of Lanthanide Elements by X‐Ray Absorption Near Edge Structure Spectroscopy

“…For example, Ln-doped glasses are known as phosphor materials. [34] The local structure and electronic structure of the dopant is known to be essential for the optical property of this kind of phosphor. EXAFS spectroscopy is a possible local structure analysis technique; however, it is generally difficult to estimate local structure because of its amorphous nature.…”

Broadband light sources using InAs quantum dots with InGaAs strain‐reducing layers

“…Since OCT is based on the Michelson interferometer, a low-coherence broadband light source has some advantages for ultrahigh axial resolution [1]. To avoid multiple scattering in skin tissue and fiber loss, the operating wavelength is necessary to be in the range of 1.0 μm-1.3 μm [2].…”

Ultrahigh-Resolution Optical Coherence Tomography with LED-Phosphor-Based Broadband Light Source

“…For the applications of LED on OCT, Fuchi et al have demonstrated several near-infrared (NIR) sources, including size-dispersed quantum dots LED, 12) and NIR glass phosphors pumped by 590 nm visible LED. 13,14) Broadband emissions with 4.6 m interference signals were observed with high power using NIR glass phosphors and an LED as excitation source. 14) Thus, finding the framework for linking broadband glass-phosphor-based light source and performing corresponding ultrahigh-resolution optical coherence imaging is an important topic in the following research.…”

“…13,14) Broadband emissions with 4.6 m interference signals were observed with high power using NIR glass phosphors and an LED as excitation source. 14) Thus, finding the framework for linking broadband glass-phosphor-based light source and performing corresponding ultrahigh-resolution optical coherence imaging is an important topic in the following research.…”