Broadband dispersive Ge/YbF₃ mirrors for mid-infrared spectral range

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Ultrashort laser pulse manipulation requires precise control of spectral phase.
• Existing dispersive optics often have limitations in specific spectral ranges or material compatibility.

Purpose of the Study:

• To develop novel broadband dispersive mirrors for the mid-infrared (mid-IR) spectral range.
• To utilize new material combinations (Germanium and Ytterbium Trifluoride) for multilayer dispersive optics.
• To compensate for group delay dispersion (GDD) and residual phase modulation in mid-IR laser systems.

Main Methods:

• Design and fabrication of multilayer dielectric coatings using Ge and YbF3.
• Experimental estimation of mechanical stresses in the optical coatings.
• Measurement of spectral and phase properties of the developed mirrors.

Main Results:

• First-time development of dispersive mirrors operating in the 6.5-11.5 μm mid-IR range.
• Successful implementation of Ge and YbF3 layers in multilayer dispersive optics.
• Demonstrated compensation of GDD from ZnSe windows and residual phase modulation for ultrashort pulses.

Conclusions:

• The developed Ge/YbF3 mirrors represent a significant advancement for mid-IR ultrashort pulse applications.
• These mirrors offer a new solution for dispersion management in the 6.5-11.5 μm spectral region.
• The novel material combination and design enable enhanced performance of mid-IR laser systems.