cw Terahertz Generation – Spectroscopy Kit

Spectroscopy Kit for TOPTICA’s cw terahertz package: Fiber-pigtailed photomixers.

Leading-edge photomixer technology
New: GaAs and InGaAs-based emitter/receiver modules
Typ. 1800 GHz bandwidth (GaAs), 1200 GHz (InGaAs)
Terahertz power up to µW levels
Signal-to-noise ratio up to 80 dB
Fully packaged antenna modules with SM/PM fiber pigtail
Requires Standard Package
Can be used with High Power Extension (recommended)
Highest resolution (1 MHz) with High Precision Extension

The cw spectroscopy kit is now available for both 850 nm and 1550 nm, employing state-of-the-art GaAs or InGaAs photomixers. The modules are equipped with SM/PM fiber pigtails and provide a high bandwidth, attractive terahertz power levels, and excellent signal-to-noise ratios. The package is complemented by TOPTICA's proprietary TeraControl unit TC 110 – a digital lock-in amplifier module – and an intuitive software interface.

Technical Information

Specifications:
Wavelength range	853 + 855 nm	1546 + 1550 nm
Semiconductor material	GaAs	InGaAs on InP
Emitter / receiver	2 x photomixer	High-speed photodiode/ photomixer
Antenna type	Broadband log-spiral	Bow-tie
Terahertz scan range	50 – 1800 GHz*	50 – 1200 GHz*
Emitter bandwidth	> 3 THz	~ 2 THz
Terahertz power (typ.)	2 µW @ 100 GHz 0.3 µW @ 500 GHz**	4 µW @ 100 GHz 0.5 µW @ 500 GHz
Terahertz SNR	80 dB @ 100 GHz 70 dB @ 500 GHz***	70 dB @ 100 GHz 50 dB @ 500 GHz***
Photomixer package	Cylindrical, Ø 1”, Integrated Si lens and SM/PM fiber pigtail	Cylindrical, Ø 30 mm, Integrated Si lens and SM/PM fiber pigtail
Recommended operating conditions	Laser power 50 mW Bias ± 10 V	Laser power 20 mW Bias 0 / -1.5 V
Lock-in amplifier	TeraControl TC 110 (included)
Transimpedance amplifier	PDA-S (included)
Frequency control	External PC, USB interface
Software	Control program with GUI inculded
Terahertz optomechanics	U.r. (Extended Version)
Motorized delay stage	U.r. (Extended Version)
Key advantages	High bandwidth High SNR	Compact laser unit Low cost
* Corresponds to the tuning range of the DFB lasers. Other ranges on request. With High Power Extension. * At 300 ms integration time.

Schematic setup of TOPTICA’s cw Terahertz Spectroscopy Kit, in basic and extended version.

cw Terahertz Spectroscopy Kit: Basic version (blue) and extended version (yellow).

Dynamic range of TOPTICA’s cw terahertz system, using the cw Spectroscopy Kit.

Dynamic range of the 850 nm system for terahertz frequencies of 50 – 2000 GHz.
The dips are absorption lines of water vapor.

Fiber-pigtailed photomixers, as used in TOPTICA’s cw Terahertz Spectroscopy Kit.

Photomixers with broadband spiral antenna, Silicon lens, and single-mode fiber pigtail.

TeraControl TC110, digital lock-in module as used in TOPTICA’s cw Terahertz Spectroscopy Kit.

TeraControl TC 110: Digital lock-in for bias modulation and photocurrent detection.

Options & Related Products

Options

Extended version: Xyz stages for photomixers, collimating mirrors, optical rails, motorized delay stage (upon request)
Resonant antennae (upon request)
1550 nm, InP based modules: Available from Q 03 / 2010

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