Quadrant Photodiodes consist of an single chip with four active areas, separated by a small gap.
These photodiodes are used in a wide range of applications such as position sensing of laser beams, autocollimators and other alignment applications.

Main Features:
• Spectral range: 200-1100nm
• Small GAP
• Low dark current
• High shunt resistance
• High resolution
• Special version for 1064nm.

Segmented quadrant avalanche photodiode with enhanced NIR responsivity in hermetic TO type metal can. Very low dark current due to guard ring diode.

Main Features:
• Φ 4 mm total active area
• Segmented in 4 quadrants
• QE > 80% @ 750 nm-910 nm
• Fast rise time, very low noise

Applications:
• Pulsed 905nm laser detection
• Light source positioning
• Laser alignment

Segmented quadrant avalanche photodiode with enhanced IR responsivity in hermetic TO type metal can.

Main Features:
• ø 4 mm total active area
• Segmented in 4 quadrants
• High QE for λ = 850-1064 nm

Applications:
• Pulsed 1064 nm laser detection
• Light source positioning
• Laser alignment

The lateral effect Position Sensitive Detector ( PSD) is an optoelectronic device based on Silicon PIN diode technology.
The PSD converts the energy from an incident light spot into a continuous, position relative, electrical output current. This position signal is relative to the total incident light pattern and indicates the “optical centre” of the incident light.

Main Features:
• Single axis, duo-lateral and tetra-lateral PSD types
• High position resolution
• High linearity

Quadrant photodiode array with current to voltage amplifier that provide top minus bottom and diagonal pair difference signals.
APD Modules and Evaluation Board Modules for Quadrant, Duo-Lateral PSD and Wavelength Sensitive Photodiodes.

Applications:
• NIR & Visible pulsed light positioning and tracking
• Laser beam centering

The HgCdTe detectors can be fabricated in quadrant arrays for tracking and positioning systems, scanning systems and night vision equipment.


The quadrant arrays require a common lead between the four elements in either the X or Y direction.