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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Polarization-Tailored Raman Frequency Conversion in Chiral Gas-Filled Hollow-Core Photonic Crystal Fibers.

S Davtyan¹, D Novoa¹, Y Chen¹

¹Max Planck Institute for the Science of Light, Staudtstrasse 2, 91058 Erlangen, Germany.

Physical Review Letters

|May 4, 2019

Summary

Researchers developed a novel helically twisted hollow-core fiber to generate tunable, circularly polarized light. This breakthrough overcomes limitations of conventional methods, enabling new applications in laser science and biomedicine.

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Area of Science:

Optics and Photonics
Laser Science
Materials Science

Background:

Broadband-tunable circularly polarized light is essential for laser science, biomedicine, and spectroscopy.
Existing methods using nonlinear conversion and standard optics are limited by material transparency and polarization instability.
Gas-filled hollow-core photonic crystal fibers offer tunable dispersion and high Raman efficiency but struggle with preserving circular polarization due to linear birefringence.

Purpose of the Study:

To develop a novel fiber-based source for generating broadband-tunable, pure circularly polarized light.
To overcome the limitations of conventional methods and existing hollow-core fibers in maintaining polarization states.
To enable continuous tuning of the polarization state of frequency-shifted Raman signals.

Main Methods:

Fabrication and utilization of a helically twisted hollow-core photonic crystal fiber.
Generation of Stokes and anti-Stokes signals via rotational Raman scattering in hydrogen gas.
Continuous tuning of the polarization state by adjusting gas pressure near the gain-suppression point.

Main Results:

The helically twisted fiber exhibits circular birefringence, robustly maintaining circular polarization against external perturbations.
Pure circularly polarized Stokes and anti-Stokes signals were successfully generated.
The polarization state of the Raman bands was continuously tunable by gas pressure.

Conclusions:

A revolutionary approach using helically twisted hollow-core photonic crystal fiber enables robust maintenance of circular polarization.
This technology facilitates the generation of pure, tunable circularly polarized broadband light via Raman scattering.
The findings pave the way for compact, efficient, fiber-based light sources with fully controllable polarization states.