Single-shot terahertz time-domain spectrometer using 1550 nm probe pulses and diversity electro-optic sampling

Area of Science:

• Physics
• Spectroscopy
• Optics

Background:

• Classical terahertz spectroscopy methods (Fourier Transform, Time-Domain) are impractical for high peak power, low repetition rate sources like intense lasers or accelerators.
• Existing techniques require extensive measurement times, limiting their application with advanced terahertz sources.

Purpose of the Study:

• To present and test a novel time-domain spectrometer designed for single-shot terahertz spectral recording.
• To enable practical terahertz spectroscopy with high peak power, low repetition rate sources.
• To expand the application range of cutting-edge terahertz sources.

Main Methods:

• Development of a novel time-domain spectrometer utilizing a 1550 nm probe fiber laser.
• Implementation of single-shot operation via chirped-pulse electro-optic sampling in Gallium Arsenide.
• Achieving high bandwidth using the Diversity Electro-Optic Sampling (DEOS) method.

Main Results:

• The novel spectrometer successfully recorded real-time terahertz spectra at the TeraFERMI Coherent Transition Radiation source.
• The system demonstrated a 2.5 THz bandwidth and a maximum dynamic range of 25 dB.
• Measurement time was reduced from minutes to a split-second.

Conclusions:

• The developed single-shot terahertz spectrometer is effective for high peak power, low repetition rate sources.
• This technology significantly enhances the practicality and application scope of advanced terahertz sources.
• The system offers a rapid and efficient method for terahertz spectral analysis.