High-repetition-rate optical delay line using a micromirror array and galvanometer mirror for a terahertz system.

Area of Science:

• Optics and Photonics
• Spectroscopy
• Materials Science

Background:

• Terahertz time-domain spectroscopy (THz-TDS) is a powerful technique for characterizing materials.
• Achieving high repetition rates in THz-TDS systems is crucial for improving measurement speed and signal-to-noise ratio.
• Existing optical delay lines can limit the repetition rate of THz-TDS systems.

Purpose of the Study:

• To develop a high-repetition-rate optical delay line for terahertz time-domain spectroscopy.
• To demonstrate the performance of the new optical delay line in measuring terahertz waveforms.

Main Methods:

• Fabrication of a micromirror array using x-ray lithography.
• Integration of the micromirror array with a galvanometer mirror to create the optical delay line.
• Implementation of the optical delay line in a terahertz time-domain spectroscopy setup.

Main Results:

• Successful development of a high-repetition-rate optical delay line.
• Demonstration of terahertz time-domain waveform measurements up to 25 Hz.
• The micromirror array fabrication via x-ray lithography proved effective.

Conclusions:

• The developed optical delay line is suitable for high-repetition-rate terahertz time-domain spectroscopy.
• This technology can significantly enhance the speed and efficiency of THz-TDS measurements.
• The use of x-ray lithography for micromirror fabrication is a viable approach for optical system development.