DUV coherent light emission from ultracompact microcavity wavelength conversion device.

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Wavelength conversion efficiency is enhanced by the square of the electric field amplitude of pump light within a microcavity.
• Existing methods often require specific crystal properties like birefringence or ferroelectricity, limiting material choices.

Purpose of the Study:

• To develop an ultracompact, all-solid-state deep-ultraviolet (DUV) coherent light source.
• To demonstrate efficient wavelength conversion in a material not exhibiting birefringence or ferroelectricity.

Main Methods:

• Designed a novel microcavity device leveraging enhanced electric field amplitude for wavelength conversion.
• Utilized a low-birefringence, paraelectric strontium tetraborate (SrB4O7) crystal with high transparency down to 130 nm.
• Demonstrated deep-ultraviolet coherent light generation at 234 nm.

Main Results:

• Achieved efficient 234 nm deep-ultraviolet coherent light generation using SrB4O7 in a microcavity.
• The device design allows for the use of materials previously unsuitable for wavelength conversion.
• Confirmed the potential of the generated wavelength for applications like human-body irradiation disinfection tools.

Conclusions:

• The developed microcavity device enables efficient DUV coherent light generation.
• Strontium tetraborate is a promising material for wavelength conversion in DUV applications.
• This technology offers a pathway toward practical, all-solid-state DUV light sources for disinfection and other applications.