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Optical Pump Terahertz Probe System
Optical Pump Terahertz Detection (OPTP) technology is a method used for studying the ultrafast carrier dynamics in semiconductors. THz has the characteristic of low photon energy, and it is highly sensitive to the changes and distributions of carriers in semiconductors. Therefore, THz is very suitable for being used as a probe to study the ultrafast carrier dynamics processes in semiconductors. When a laser excites semiconductor materials, the excited electrons and holes in the material will occupy some energy states, resulting in a decrease in the transmission rate of THz. As the carriers recombine, the transmission rate of THz will gradually increase. Thus, the dynamic process of non-equilibrium carriers in semiconductors can be obtained through the study of the THz transient transmission spectrum.
The optimized terahertz time-domain spectroscopy optical path structure has enhanced the system stability, effectively eliminated chromatic aberration in the optical path, and achieved better focusing effect of the terahertz light spot. While ensuring the high signal-to-noise ratio of the system, we also ensured the measurement stability and repeatability of the system, laying a solid foundation for the subsequent optical pumping - terahertz detection. Additional requirements can be selected for upgrade based on customer needs, such as 800 nanometers and 400 nanometers optical pumping. It should be particularly noted that if the femtosecond laser is equipped with an optical parametric amplifier system, we can integrate its output light as the optical pumping source, expanding the system's optical pumping capability to the ultraviolet-visible-near-infrared band, thereby significantly enhancing the system's testing capability. At the same time, we can also assist customers in integrating temperature control systems, electromagnetic fields, sample scanning imaging and other options.
Terahertz time-domain spectroscopy and spectral signals (the transmitting end is: [110] crystal orientation znte, thickness 2mm; the receiving end is: [110] crystal orientation znte, thickness 2mm).
Time-resolved terahertz spectroscopy
OPTP System Parameters | |
Terahertz Transmitter | Photoconductive antenna / ZnTe crystal / Lithium niobate crystal |
Terahertz Receiver | Photoconductive antenna / ZnTe crystal / GaP crystal |
Spectral Range | 0.1-3THz/0.1-6THz |
Dynamic Range | ≥60dB |
Pump Wavelength | 800nm/400nm(Tunable wavelength via OPA is optional) |
Requirements for Laser | |
Wavelength | 800nm |
Pulse Width | ≤150fs |
Repetition Rate | 1KHz/80MHz/100MHz |
Average Power | ≥2W |