SpotOn Compact-Position Sensing

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SpotOn Compact-Position Sensing

The unit comes with USB2.0 interface, detector and software work with Windows XP/Vista/7/8/10.

High accuracy compact beam positioning system. No need for manifold box.

Built-in electronics within sensor head.

Measure both position and power, available with dual axis Lateral effect detector (down to 0.1um resolution @ 50Hz digital filter, +/-6um absolute accuracy), or with 4-Quadrant detector (accuracy down to +/-0.025% of beam diameter).


Detector L – Lateral Effect L04 Q – Four Quadrant
Size 9 x 9 mm 4 x 4 mm 10 x 10 mm
Type Dual axis Si, No glass cover Dual axis Si, No glass cover 4x Si sectors seperated by 30 μm gap, No glass cover
Usable beam size ⌀50μm to ⌀9 mm ⌀50μm to ⌀4 mm  ⌀50μm to ⌀5 mm
Position measurement range ⌀9 mm ⌀4 mm One beam radius up to ±2.5 mm
Position resolution Down to 0.1 μm at 50 Hz digital filter plus averaging Down to 0.1 μm at 50 Hz digital filter plus averaging Down to 0.25% of beam size
Position accuracy ±12.5 μm over 9 mm dia. ±6 μm over 4 mm dia. ±1μm or ±0.025% of beam size
Update rate Max. 150 Hz at 500 Hz digital filters
Operational Spectral range 350 – 1100 nm
Power range 10 μW to 10 mW with attenuating ND filters
Power accuracy (*) ±5%

Ordering Information

SPOTCOM – Complete system including sensor head, USB2.0 mini 1.8m cable, software and user manual on CD, Carrying case. Select anyone of the heads, calibration files are saved on the PSD heads and load automatically to the software:

  • L – Lateral effect PnP 9mmX9mm, no glass cover
  • Q – Four quadrant PnP 10mmX10mm with 30um gap, no glass cover
  • L04 – Lateral effect PnP 4mmX4mm, no glass cover



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