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4-quadrant photodetector

PRODUCTS > PHOTONICS > PHOTODETECTORS > 4-QUADRANT PHOTODETECTOR
PD4Q - 4-quadrant photodetector
PD4Q - 4-quadrant photodetector PD4Q - Output noise density PD4Q - Frequency response PD4Q - Noise Equivalent Power PD4Q - Functional diagram PD4Q - Position noise

Koheron PD4Q is a 4-quadrant photodetector with 100 kV/A transimpedance gain and 200 kHz bandwidth. The PD4Q outputs three voltages: X = (A+D)-(B+C), Y = (A+B)-(C+D) and SUM = (A+B+C+D)/4. Thanks to its low noise and high dynamic range, the PD4Q can measure laser beam position with a resolution below 20 nm in a 10 kHz bandwidth.

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Specifications

PD4Q-100k
Detector
Wavelength range 400 nm to 1050 nm
Active area per quadrant 12.3 mm²
Photodiode peak responsivity (at 900 nm) 0.64 A/W
Maximum photocurrent per quadrant 100 µA
Electronics
3 dB bandwidth 250 kHz
Transimpedance gain 100 kV/A
Noise Equivalent Power 1.6 pW/√Hz (at 10 kHz)
Output impedance 1 kΩ
Output voltage range -10 V to 10 V
Output SMA female connector
Power supplies
Positive supply voltage 11.5 V to 13 V (12 V nominal)
Negative supply voltage -13 V to -11.5 V (-12 V nominal)
Quiescent current 20 mA per rail
Maximum current 75 mA per rail
Other
Outside dimensions 60 mm x 49 mm x 18 mm
Operating temperature 0 °C to 50 °C
Weight 43 g

More Photodetectors

Functional diagram

PD4Q functional diagram

Characterization

Output noise

Noise density of the X output (X = (A+D)-(B+C)) with and without light. Optical source is a 810 nm LED driven by a Koheron DRV110-A-375 laser driver.

PD4Q-100k output noise

Frequency response

PD4Q-100k frequency response

Noise equivalent power

Measured at 810 nm.

PD4Q noise equivalent power

Position noise

The Noise Equivalent Power (NEP) of the detector can be converted into a position noise spectral density:

$$ L_{n} = \sqrt{\mathrm{NEP}^{2} + \frac{2 e P_{\rm opt}}{S}} . \frac{D}{P_{\rm opt}}, $$

where $D$ is the beam diameter, $P_{\rm opt}$ is the total input optical power and $S$ is the photodiode responsivity. Below is the position noise over a $\Delta f$ = 10 kHz bandwidth for a 800 nm laser with 4 mm beam diameter:

PD4Q-100k position noise

Complementary products

Dual power supply

Dual power supply

245 €

Ordering codes

REFERENCE ATTRIBUTE
PD4Q-100k

Export information

REFERENCE COUNTRY OF ORIGIN HS CODE HTSUS ECCN
PD4Q-100k France 85414900 8541499500 EAR99

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