Ideal for beam-stabilization applications
Analog output
Convenient adjustable gain settings and switchable output normalization
Quadrant-cell photoreceivers are ideal when you need to measure deviations in the position or pointing of your laser beam, such as that required in beam-stabilization systems.
Quadrant-cell photoreceivers consist of four individual yet identical photocells positioned very close to each other (100-µm gaps). To increase the sensitivity of these photoreceivers, each of the cells’ photocurrents is sent to its own individual amplifier before being processed with the other photocell signals to generate top-minus-bottom difference (vertical error) and right-minus-left difference (horizontal error) signals. A sum-of-all-quadrants signal is also provided for normalization purposes.
Model 2901 offers silicon sensors which are responsive in the 190-1050 nm wavelength range. Model 2903 uses InGaAs sensors for 900-1700 nm responsivity.
The 2901 and 2903 quadrant-cell photo-receivers can run off batteries or your own DC power supply. To ensure low noise operation, we strongly recommend our Model 0901 power supply.
Shared-beam experiments
Beam stabilization
Semiconductor capital equipment
Defense and aerospace
Life sciences
| 2901 | 2903 | |
|---|---|---|
| Sensor Size (mm) | 3 x 3 | Ø3 |
| Wavelength Range (nm) | 190-1050 | 900-1700 |
| Conversion Gain, Maximum (V/W) | 102 to 106 | 103 to 105 |
| Responsivity (A/W) | 0.5 | 1 |
| Transimpedance Gain | 2x102 to 2x106 V/A | 2x102 to 2x106 V/A |
| Saturation Power CW | 30 mW per channel | 15 mW per channel |
| Output | Analog | Analog |
| Digital Output | ||
| Connector, Analog Output | Male BNC | Male BNC |
| Analog Output | X, Y, SUM | X, Y, SUM |
| Analog Output Impedance | 100 Ω | 100 Ω |
| Analog Output Voltage Range (V) | +2,5 | +2,5 |
| Bandwidth (-3 dB) () | 100 kHz | 100 kHz |
| Power Requirements | ±15 V or 9-V Battery | ±15 V or 9-V Battery |
