Fiber-based, hybrid terahertz spectrometer using dual fiber combs

Area of Science:

• Spectroscopy
• Optics and Photonics
• Terahertz Technology

Background:

• Terahertz (THz) spectroscopy is crucial for material analysis and imaging.
• Existing THz spectrometers often face limitations in terms of size, cost, or spectral resolution.
• Dual fiber-laser-based frequency combs offer a promising avenue for advanced THz spectroscopic techniques.

Purpose of the Study:

• To construct a novel fiber-based, hybrid THz spectrometer.
• To integrate two distinct THz spectroscopic working modes into a single instrument.
• To evaluate the performance and potential applications of the developed spectrometer.

Main Methods:

• Utilized dual fiber-laser-based frequency combs to create a hybrid THz spectrometer.
• Implemented asynchronous-optical-sampling THz time-domain spectroscopy (AOS-THz-TDS) for broad spectral range measurements.
• Employed multiple-frequency-heterodyning THz comb spectroscopy (MFH-THz-CS) for detailed spectral structure analysis.

Main Results:

• Achieved a 2 THz spectral range and a dynamic range of 100 in 200ms single-sweep AOS-THz-TDS mode.
• Successfully observed the detailed structure of the THz frequency comb in MFH-THz-CS mode.
• Demonstrated compactness, robustness, flexibility, and cost-effectiveness of the hybrid spectrometer.

Conclusions:

• The developed hybrid THz spectrometer offers high spectral resolution and rapid data acquisition.
• The instrument combines the strengths of AOS-THz-TDS and MFH-THz-CS for versatile THz analysis.
• This compact and cost-effective spectrometer has significant potential for practical applications in various scientific and industrial fields.