Product Introduction

Terahertz (THz) refers to the frequency range of electromagnetic waves from 0.1 THz to 10 THz, corresponding to wavelengths between 3 mm and 0.03 mm. Compared to the microwave and infrared radiation on both sides, which have been extensively studied and widely used in daily life, the development of terahertz technology has been relatively lagging behind for a long time. However, the application prospects of terahertz technology cannot be ignored. Experiments have shown that various chemicals, including drugs and explosives, have inherent "fingerprint spectra" in the terahertz spectral range, which gives terahertz waves unique advantages in security detection related applications. In addition, terahertz technology also has potential in healthcare. Some tumors and drugs also have unique terahertz fingerprints, which can be detected and analyzed through terahertz waves.

In the terahertz time-domain spectroscopy system (THz TDS), 1-2 sets of optical delay lines are used according to actual needs. Their functions are: (1) to change the relative delay between terahertz waves and detection light reaching the detector (or electro-optic crystal), achieving complete sampling of terahertz ultrafast pulses; (2) Adjust the delay amount. When selecting fiber delay lines for THz TDS systems, the following indicators need to be considered:
Delay scanning range: determines the spectral resolution of the system;
Delay step length: affects the spectral width of the system;
Delay repetition positioning accuracy: affects the signal-to-noise ratio of the high-frequency part of the spectrum and the effective spectral width of the system;
Insertion loss consistency: affects the consistency of terahertz time-domain waveform sampling data;
Insertion loss: Due to the minimal impact of the output power of femtosecond lasers on cost factors, insertion loss is not a key consideration when choosing fiber delay lines. Relatively speaking, the consistency index of insertion loss is more important;
Dispersion effect: affects the output pulse width of femtosecond laser;
Reliability: It is particularly important for building industrial grade terahertz time-domain spectroscopy systems.
Our THz TDS system has special requirements, and we have launched a fiber delay line product optimized for the all fiber coupled terahertz time-domain spectroscopy system, which can ensure that the time-domain waveform sampling rate of the THz TDS system reaches 10 waveforms/second and the spectral sampling width reaches 5.5 THz 1.

Highlights of Terahertz Time Domain Spectrometer Products
High sensitivity (dynamic range better than 80dB)
Broadband spectrum (0.1-5.5 THz)
• Fast scanning (up to 10 spectra per second)
• Stable performance（1-second report result)

•Strong scalability: supports multiple measurement modes such as transmission&reflection and imaging

Terahertz time-domain spectrometerActual measurement chart

Technical parameters of terahertz time-domain spectrometer products

Shanghai Yichi Optoelectronic Technology Co., Ltd