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13 March 2024 Advanced single-mode VCSEL fiber pigtail
M. Grabherr, M. Zorn, Lin R. Borowski
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Proceedings Volume 12904, Vertical-Cavity Surface-Emitting Lasers XXVIII; 129040C (2024) https://doi.org/10.1117/12.3000185
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
Single-mode VCSELs are almost perfect laser sources in terms of beam shape, spectral purity, and wavelength control. For many applications, e.g. tunable diode laser absorption spectroscopy (TDLAS), fiber coupling to single-mode fibers would offer additional benefits. In addition to the challenging 5 axis geometrical alignment on micron scale any mode field diameter mismatch between VCSEL and fiber is limiting the achievable coupling efficiency. Furthermore, temperature and current dependent emission angle could add to non-linearity of the coupled intensity. We present a detailed analysis of the dependencies of farfield angle with temperature, current, and laser aperture for surface relief stabilized single-mode VCSELs [1]. We describe the coupling to HP780 single-mode fiber, free of optical feedback, and finally present related performance parameters of an advanced single-mode VCSEL pigtail emitting at 760 nm wavelength. Coupling efficiencies better than 50 % and respective output power at the fiber connector exceeding 0.5 mW are reported. The built in microTEC allows for a wavelength tuning range of more than 6 nm. Such pigtail is perfectly suited for oxygen TDLAS or other applications that require wavelength tunable laser power from a single-mode fiber and a pre-defined optical interface determined by the optical fiber only.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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M. Grabherr, M. Zorn, and Lin R. Borowski "Advanced single-mode VCSEL fiber pigtail", Proc. SPIE 12904, Vertical-Cavity Surface-Emitting Lasers XXVIII, 129040C (13 March 2024); https://doi.org/10.1117/12.3000185
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KEYWORDS
Vertical cavity surface emitting lasers
Single mode fibers
Absorption spectroscopy
Oxygen
Tunable diode lasers
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