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TeraScan

Frequency-Domain Terahertz Spectroscopy System

TopSeller systems for cw-THz spectroscopy
Includes cutting-edge GaAs or InGaAs photomixers
Highest dynamic range: TeraScan 1550, highest scan range: TeraScan 780
New: Rh:InGaAs receivers, more than 10 dB signal improvement
Applications: Spectroscopy, metamaterial research, gas sensing, THz communication testbed

TOPTICA’s TeraScan platforms are well-established “TopSeller” configurations for frequency-domain terahertz spectroscopy. The systems combine mature DFB diode lasers with state-of-the-art GaAs or InGaAs photomixers. The TeraScan 780 offers an outstanding bandwidth, and the TeraScan 1550 sets new benchmarks in terms of terahertz power and dynamic range. Both systems feature TOPTICA's proprietary “DLC smart” control electronics.

Owing to their exceptional frequency resolution, the TeraScan systems lend themselves to applications that involve spectrally narrow signatures, e.g. spectroscopy of low-pressure gases, high-Q resonators or metamaterials. In addition, users may choose to operate their TeraScan at an arbitrary, fixed frequency, a feature that has proven beneficial in terahertz communication research.

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Specification

Specification	TeraScan 780	TeraScan 1550
Difference Frequency Tuning	1.8 THz (2.0 THz typ.)	1.2 THz (up to 2.7 THz with Tuning Range Extension)
Terahertz dynamic range (300 ms integration time)	80 dB @ 100 GHz 70 dB @ 500 GHz	90 dB @ 100 GHz 70 dB @ 500 GHz
Minimum frequency step size	< 10 MHz

Tuning Speed	Up to 100 GHz / sec
Frequency accuracy	< 2 GHz
Terahertz emitter	PCA-FD-0780-100-TX- , GaAs photomixer	PCA-FD-1550-100-TX-1, InGaAs photodiode
Terahertz receiver	PCA-FD-0780-130-RX-1, GaAs photomixer	PCA-FD-1550-130-RX-1, InGaAs photomixer
Receiver option		THz PCA / HF cw: Use of Rh:InGaAs receiver instead of the standard one, signal improvement > 10 dB
Antenna type	Log-spiral	Bow-tie
Terahertz polarization	Circular	Linear
Emitter and receiver package	Cylindrical, ∅ 1", Integrated Si lens and SM/PM, fiber pigtail	Cylindrical, ∅ 25 mm, Integrated Si lens and SM/PM, fiber pigtail
Emitter and receiver bandwidth	Approx. 3 THz
Terahertz power (typ.)	2 µW @ 100 GHz, 0.3 µW @ 500 GHz	100 µW @ 100 GHz, 10 µW @ 500 GHz
Laser size and weight	Two DFB pro L laser heads, each with dimensions 90 x 90 x 244 mm (H x W x D), 2,8 kg	Two DFB pro BFY laser heads, each with dimensions 60 x 120 x 165 mm (H x W x D), 1 kg
Control unit	DLC smart
Controller size (H x W x D) + weight	19" and 1 RU (H x W x D: 45 x 480 x 290 mm), 4 kg
Computer interface	Ethernet
Software	Control software with GUI + Remote command interface
Key advantages	High bandwidth with one set of lasers	High terahertz power, compact laser unit