High-power Faraday isolator on a uniaxial CeF₃ crystal

Area of Science:

• Optics
• Materials Science
• Photonics

Background:

• Faraday isolators are crucial for protecting laser systems from back-reflected light.
• High-power laser applications demand isolators capable of handling significant optical power.
• Anisotropic magneto-optical elements (MOE) offer potential for novel isolator designs.

Purpose of the Study:

• To develop and demonstrate the first high-power Faraday isolator utilizing an anisotropic magneto-optical element (MOE).
• To evaluate the performance of a Faraday isolator based on a uniaxial cerium fluoride (CeF3) crystal under high laser power.
• To assess the impact of crystal anisotropy on isolator performance and operational requirements.

Main Methods:

• Fabrication of a Faraday isolator incorporating a uniaxial CeF3 crystal as the magneto-optical element.
• Characterization of the isolator's isolation degree under high average laser radiation power.
• Analysis of the influence of the anisotropic nature of the CeF3 crystal on device performance.

Main Results:

• The developed Faraday isolator achieved an isolation degree of 30 dB.
• The isolator successfully operated at a high average laser radiation power of 700 W.
• The anisotropic properties of the CeF3 crystal did not impose significantly stringent requirements on the optical beam or the MOE itself.

Conclusions:

• The first high-power Faraday isolator based on an anisotropic magneto-optical element (MOE) has been successfully created.
• Uniaxial CeF3 crystals are suitable for high-power Faraday isolator applications, demonstrating excellent isolation performance.
• The anisotropic nature of the crystal presents manageable design considerations for high-power optical systems.