Photobiomodulation (PBM) using organic light-emitting diodes has attracted much attention in biomedical applications. However, therapeutic effects and cytotoxicity of PBM using organic light-emitting diode (OLED) have not been addressed in vitro and in vivo. In this study, the cytotoxicity and skin care effects of OLED lighting modules according to RGB wavelengths were compared with light-emitting diode (LED). Skin care effect of OLED and LED was demonstrated by observing suppression of Nitrogen Oxide production, decrease of melanin synthesis and increase of collagen production.
We demonstrate a highly linear wavenumber- swept active mode locking (AML) fiber laser for optical sensing and imaging without any wavenumber-space resampling process. In this all-electric AML wavenumber-swept mechanism, a conventional wavelength selection filter is eliminated and, instead, the suitable programmed electric modulation signal is directly applied to the gain medium. Various types of wavenumber (or wavelength) tunings can be implemented because of the filter-less cavity configuration. Therefore, we successfully demonstrate a linearly wavenumber-swept AML fiber laser with 26.5 mW of output power to obtain an in-vivo OCT image at the 100 kHz swept rate.
A holey optical fiber (HOF) wavelength division multiplexing (WDM) coupler, which divides optical waves according
to their wavelengths, has been made by using the Fused Biconical Tapered (FBT) method. The transmission band of the
proposing HOF WDM coupler could be easily tuned by adjusting the pulling length during the FBT process. The HOF
used for the WDM coupler was designed to be bending insensitive, which could withstand a bending radius of up to 6
mm. Interestingly, it was observed that the air hole structure of the HOF should be maintained to have the property of a
WDM coupler. The cross sectional SEM images of the implemented HOF WDM coupler are presented along with the
light intensity distribution at the coupling region. The proposed HOF couplers may find applications as optical CWDM
(coarse wavelength division multiplexing) filters and as optical fiber sensors also.
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