Tuning Range Extension

Tuning range extensions for frequency-domain terahertz systems

Third laser head – access to higher frequencies
Exploits full bandwidth of InGaAs photomixers
Tuning range up to 2.0 THz or 2.7 THz
Frequency calibration for each 2-laser subset
Requires TeraScan 1550 or TeraBeam 1550

TOPTICA is been able to push the frequency limits of frequency-domain spectrometers. Whilst one DFB laser at 1.5 µm offers a tuning range of approximately 600 GHz, a combination of three lasers covers the entire range from DC to 2.0 THz, or – using more elaborate combinations – even up to 2.7 THz. TOPTICA’s “Tuning Range Extension” thus provides access to frequencies that used to be beyond reach with commercial frequency-domain spectrometers.

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Specification

Specifications	THz Tuning Extension 2.0	THz Tuning Extension 2.7
Base system	TeraBeam 1550 (λ₁ = 1550 nm, λ₂= 1545 nm)
3rd laser	λ₃ = 1533 nm
Difference frequency tuning	0 - 2.0 THz 0 - 1.2 THz with lasers #1 and #2 ("TeraBeam") 0.9 - 2.0 THz with lasers #2 and #3	0 - 2.7 THz 0 - 1.2 THz with lasers #1 and #2 ("TeraBeam") 0.9 - 2.0 THz with lasers #2 and #3 1.5 - 2.7 THz with lasers #1 and #3

Specifications

THz Tuning Extension 2.0

THz Tuning Extension 2.7

Base system

TeraBeam 1550 (λ₁ = 1550 nm, λ₂= 1545 nm)

3rd laser

λ₃ = 1533 nm

Difference frequency tuning

0 - 2.0 THz
0 - 1.2 THz with lasers #1 and #2 ("TeraBeam")
0.9 - 2.0 THz with lasers #2 and #3

0 - 2.7 THz
0 - 1.2 THz with lasers #1 and #2 ("TeraBeam")
0.9 - 2.0 THz with lasers #2 and #3
1.5 - 2.7 THz with lasers #1 and #3

Additional Information

Schematic of TeraScan (red) with Tuning Range Extension (yellow).

Dynamic range of a TeraScan 1550 system with Tuning Range Extension to 2.7 THz. The vertical lines on the bottom indicate absorption frequencies of water vapour, the height of the lines corresponding to the line strength on a logarithmic scale.
Applications
Downloads
- Product Brochure Terahertz Systems
- Technical Drawings DL DFB BFY
Literature
- Scientific Paper: Deninger, A., et al., 2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers, J. Infr. THz Waves (2015)
- Scientific Paper: Roggenbruck, A., et al., Using a fiber stretcher as a fast phase modulator in a continuous wave terahertz spectrometer, J. Opt. Soc. Am. B (2012)
- Scientific Paper: Stanze, D., et al., Compact cw Terahertz Spectrometer Pumped at 1.5 µm Wavelength, J Infrared Milli Terahz Waves (2010)
- Scientific Paper: Roggenbruck, A., et al., Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples, New Journal of Physics (2010)
- Overview Article: Lang, M., et al., Laser-based terahertz generation & applications, Photonik International (2012)
- Review paper: Naftaly, M., et al., Industrial applications of terahertz sensing: State of play, Sensors (2019)
- Scientific paper: Nellen, S., et al., Experimental comparison of UTC- and PIN-photodiodes for continuous-wave terahertz generation, J Infrared Milli Terahz Waves (2019)
Related Products
- TeraScan: Complete cw-terahertz spectroscopy platform
- TeraBeam: Dual-color DFB lasers with digital driver electronics
- Phase Modulation Extension: Resolution booster
- Photomixers: Packaged modules with fiber pigtail
- Accessories: Schottky diodes and optomechanics
- TeraFlash pro: Versatile Time-Domain terahertz platform
- TeraFlash smart: Ultrafast Time-Domain Terahertz Platform

Laser power	See TeraBeam 1550
Tuning speed	See TeraBeam 1550
Frequency accuracy	See TeraBeam 1550
Laser size (H x W x D) and weight	60 x 120 x 165 mm, 1 kg
Laser diode warranty	5000 hrs or 2 years (whatever comes first)