Abstract:
We present a compact and efficient method for directly coupling a near-ultraviolet laser diode with high beam ellipticity to a hollow core fiber (HCF) using an all-fiber ...Show MoreMetadata
Abstract:
We present a compact and efficient method for directly coupling a near-ultraviolet laser diode with high beam ellipticity to a hollow core fiber (HCF) using an all-fiber mode field diameter (MFD) converter. This MFD converter, approximately 1 mm in length and composed of graded-index fiber (GIF) and coreless fiber (CSF), effectively addresses the MFD mismatch between the laser diode and HCF through image magnification. As a proof of concept, we tested a 405 nm laser diode with a beam ellipticity of 2.37. Simulations predicted a coupling efficiency of ~80%, and we achieved 67% experimentally. Additionally, we introduced an elliptic GIF to further enhance coupling efficiency for highly elliptical beams, leading to a significant performance improvement.
Published in: IEEE Photonics Technology Letters ( Volume: 37, Issue: 4, 15 February 2025)
Funding Agency:
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Microsoft Azure Fiber, Unit 7, The Quadrangle, Romsey, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
Microsoft Azure Fiber, Unit 7, The Quadrangle, Romsey, U.K.
Optoelectronics Research Centre, University of Southampton, Southampton, U.K.