Photoconductive THz near-field detector · 1550 nm

TeraSpike
TD-1550-X

Our first microprobes sampled directly by telecom-wavelength laser pulses (1500–1600 nm). Sensitive to THz field components transversal to the tip axis — with a clean spectral response thanks to the internal wave-trap.

Request a quote Technical data
Cantilever design · 1550-X-series 1550 NM
1550-X-series cantilever design with wave-trap electrodes.
40 µm
Max. spatial resolution
1500–1600 nm
Excitation wavelength
Transversal (x)
Field sensitivity
Probe design & specifications

Near-field probing at 1550 nm.

Two models

  • -HR-WT — good spatial resolution and a clean spectral response from the internal absorber (wave-trap).
  • -HR-WT-XR — increased mechanical robustness with only a moderate loss of resolution and sensitivity, for rougher applications where the sample distance is harder to control (XR-option).
  • No frequency doubling needed — for 800 nm probes on fiber lasers see the SHG-Units.

1550-X-series probes detect the field component transversal to the probe-tip axis (x), like the TD-800-X series for 700–860 nm lasers.

Technical data

Parameter-HR-WT-HR-WT-XR
Max. spatial resolution40 µm (20 µm#)80 µm
Photo-switch gap size1.5 µm1.5 µm
Dark current @ 1 V bias< 4.5 µA< 4.5 µA
Photocurrent @ 1 V bias> 12 µA*> 12 µA*
Excitation wavelength1500–1600 nm1500–1600 nm
Average excitation power1.5–3.5 mW1.5–3.5 mW
Connection typeSMPSMP

* For a focus diameter of about 20 µm, 1 V bias and 3 mW average optical excitation power. # With front-switch instead of main-switch excitation; front-switch mode shows a reduced SNR. Each probe is individually tested and ships with a manual and test certificate.

Ready to specify

Request a TD-1550-X quote.

Tell us about your fiber laser and sample — we'll recommend -HR-WT or -HR-WT-XR.

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