Schematic of an OPTP setup with external seed oscillator, FemtoFiber ultra and TeraFlash pro.
Optical-Pump THz-Probe Systems
Femtosecond lasers synchronized with a TD-THz platform
Optical-Pump THz-Probe (OPTP) measurements, also known as Time-Resolved Terahertz Spectroscopy (TRTS), explore the dynamics of materials on sub-microsecond time scales.
In a typical OPTP experiment, a femtosecond laser pulses excites a sample, and the terahertz measurement monitors the change in the properties of the sample, e.g. its transmission or its refractive index. The technique thus provides insights into charge carrier dynamics, lattice vibrations, and biological processes. OPTP applications include vibrational spectroscopy of molecules, or carrier dynamics in photoconductive and photovoltaic materials. In the latter application, the laser pulse generates charge carriers in the sample under test, and the THz measurement probes its conductivity in a contact-free, non-destructive way.
TOPTICA can optically synchronize any laser of the FemtoFiber ultra family to a TeraFlash pro system. An additional translation stage allows users to conveniently vary the time-of-arrival of the pump-laser pulses with respect to the terahertz measurement. The optical synchronization, even at visible or UV wavelengths of the FemtoFiber Ultra, guarantees an exact timing with minimum relative jitter. This enables high-precision measurements even in the most demanding applications.
For applications that require two synchronized ultrafast lasers but no terahertz measurements, TOPTICA also offers customized Optical-Pump Optical-Probe systems.
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Specification
Pump Laser* Ultra 390 Ultra 460 Ultra 525 Ultra 780 Ultra 920 Ultra 1050 Ultra 1550 Smart 1560 Wavelength 390 nm 460 nm 525 nm 780 nm 920 nm 1050 nm 1550 nm 1560 nm Average power > 100 mW > 100 mW > 1 W > 1 W > 1.5 W > 5 W > 2 W > 250 mW Pulse duration < 200 fs < 200 fs < 150 fs < 100 fs < 100 fs < 100 fs < 200 fs < 100 fs Dispersion control N.A. N.A. N.A. Integrated Integrated Integrated N.A. N.A. Power
modulationN.A. N.A. N.A. Optional AOM
> 1 MHz modulation bandwidthN.A. N.A. TeraFlash pro dual* Components One femtosecond laser at 1.5 µm
2.5 m SM/PM fiber umbilicals (alternatively 4.0 m)
2 mechanical delay stages, one stationary, one moving
2 InGaAs photoconductive switches
2 connectors for additional TX and RX antennas
Electronics for data acquisitionSpectral range / Wavelength 0.1 – 6.5 THz THz Power Up to 300 µW Time-domain dynamic range Up to 120 dB Pulse duration 500 fs typ. Repetition rate 80 MHz, optically synchronized via common laser oscillator with pump laser Relative timing control (optional) Integrated delay line to adjust the relative timing between optical pump and THz probe pulses, 500 ps total scan range *Specifications are subject to change without further notice
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