Frequency calibration of a TeraBeam 780 system. The wavelengths of the two DFB
lasers overlap at approx. 784.6 nm (shaded bar).
By heating laser #1 and cooling laser #2, the difference frequency increases up to 2.3 THz.
TeraBeam
DFB Lasers for cw Terahertz Generation
- Two DFB pro lasers + digital frequency control
- Available wavelengths: 780 nm and 1.5 µm
- Difference frequency tuning up to 2 THz
- Frequency accuracy < 2 GHz, minimum step size < 10 MHz
- Computerized frequency tuning via Ethernet
Each TeraBeam system comprises two distributed feedback (DFB) lasers with built-in optical isolators and fiber-optic beam combination. Available at 780 nm and 1.5 µm, the TeraBeam matches the excitation wavelengths of GaAs and InGaAs terahertz emitters, respectively. TOPTICA carefully selects the laser diodes with respect to their thermal tuning range. The DLC Smart controls the temperatures of both lasers with unmatched precision.
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Specification
Specification TeraBeam 780 TeraBeam 1550 Wavelength range 783 + 785 nm 1545 + 1550 nm Laser power > 40 mW (per two-color fiber output) 25 - 30 mW (per two-color fiber output) Difference frequency tuning 0 - 1.8 THz (2.0 THz typ.) 0 - 1.2 THz (up to 2.7 THz with Tuning Range Extension) - Additional Information
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