High-speed Terahertz Spectrometer

MENLO SYSTEMS-Terahertz Time Domain Solution TERA OSCAT-3w.jpg


Advanced Features and Benefits

    • NEW: Remote control and data transfer over network
    • Fast scanning without optomechanical delay unit
    • All-PM fiber laser technology with instantaneous mode locking, for highest stability and reliability
Antenna model TERA15-FC*
Spectral range >3 THz in step mode, >1 THz in rapid mode
Dynamic range >60 dB in step mode, >35 dB in rapid mode
Total scan range up to 4 ns (pulse-to-pulse, virtually unlimited)
Rapid scan range up to 40 ps
Rapid scan rate >200 waveforms / s
THz frequency resolution <3 GHz
Scan mode rapid / step scan
Laser specifications  
Wavelength 1560 nm
Total average output power >60 mW
Repetition rate 250 MHz
Output port configuration 2 x fiber coupled FC/APC ports, PM fiber
Pulse duration <90 fs directly from laser, <120 fs after OSCAT delay line
Dimensions / weight  
Optical unit 450 x 560 x 200 mm³ / 34 kg
THz control electronics 448 x 132 x 550 mm3 / 10 kg   

*depending on measurement settings


Our new TERA OSCAT all fiber Terahertz spectrometer for fast data acquisition is based on the novel OSCAT (Optical Sampling by CAvity Tuning) technique. It enables THz time-domain spectroscopy without any external delay line. Similar to the ASOPS technique, the OSCAT offers the capability of high-speed imaging measurements and great flexibility of the system configuration.

The OSCAT principle makes use of a varying laser repetition rate and two differently long output fibers, introducing a variable delay between the femtosecond pulses arriving at the THz emitter and the receiver antenna. The scanning through repetition rate variation eliminates constraints of the conventional mechanical delay lines. The apparatus is designed to be user friendly and nearly alignment-free, enabling quick changing between transmission and reflection measurement geometry.

With its two modes of operation, TERA OSCAT is a versatile tool for high-resolution and for high-speed data acquisition applications. The high-resolution operation mode offers a high signal dynamic range for THz broadband spectroscopy. Operation in the high-speed mode enables unprecedented fast THz measurements, and is ideally suited for THz imaging applications or measurements of samples in a pulsed field.

It has been shown that Terahertz technology is capable of inline and non-destructive material inspection in polymer industry. Industrial environment includes strongly varying temperature, humidity and acoustic vibrations.

System components:

  • femtosecond Er-doped fiber oscillator with 250 MHz repetition rate
  • THz path with fiber coupled emitter and receiver modules and broadband polymer THz optics
  • OSCAT electronics based on our SYNCRO platform for laser repetition rate control
  • PC with data acquisition platform and evaluation software


  • TERA Image Extension Unit

    Product Code: TERA Image


    For THz imaging applications our fully automated extension TERA Image can be integrated.

    DownloadTERA Image information.

  • Reflection Guide Add-on for flexible THz measurement geometry

    Product Code: Reflection Guide


    THz path pivot platform for quick and flexible manual adjustment of the reflection angle, ranging from a minimal reflection angle of 38° to normal up to a stretched configuration for measurements in transmission geometry. A scale for measurement angle indication is included. The platform assures automatic angle adjustment of the sample holder.

  • ImageLab: Extended Edition THz Image Analysis

    Product Code: ImageLab


    Hyperspectral Image Processing Software for THz Imaging Data


Timing jitter of the OSCAT laser:

OSCAT timing jitter


Rapid scan THz trace:

OSCAT rapid scan trace

Dr. Christoph Gleichweit
Your direct line to our expert

Data sheets

Product literature

Ordering information

  • Product Code


+49 89 189166 0

Menlo Systems, Inc.

+1 973 300 4490

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