Efficient coupling of several broad area laser diodes into an optical fiber

Abstract

A high brightness, fiber coupled optical pumping system is described based on readily available optical components. Operating at a wavelength of 670 nm we have achieved an output of 1.25 W from a 50 mu m core diameter fiber (0.22 NA) and 3.5 W from a 100 mu m core diameter fiber (0.22 NA). This represents a six- to eightfold increase over commercially available systems at that wavelength. The design is generic and can immediately be implemented at other wavelengths, where high brightness pumping systems are not commercially available. The design and implementation are detailed

Instrumentation in Diffuse Optical Imaging

“…For example, it was shown very recently that multi-mode fibers significantly improved the SNR in diffuse correlation spectroscopy due to increased admittance of signals [ 23 ]. In multispectral imaging, light generated from multiple diverging sources can be simultaneously coupled into a single optical fiber, e.g., using a tilted coupling lens [ 24 ]. The advantages of fiber-coupling include high flexibility in hardware configuration and improved instrument ruggedness.…”