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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 250 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-10k PD4Q-100k
Detector
Wavelength range 400 nm to 1050 nm 400 nm to 1050 nm
Active area per quadrant 12.3 mm² 12.3 mm²
Photodiode peak responsivity (900 nm) 0.64 A/W 0.64 A/W
Maximum photocurrent per quadrant 1 mA 100 µA
Electronics
3 dB bandwidth 500 kHz 250 kHz
Transimpedance gain 10 kV/A 100 kV/A
Noise Equivalent Power 8.3 pW/√Hz (at 10 kHz) 1.6 pW/√Hz (at 10 kHz)
Output impedance 1 kΩ 1 kΩ
Output voltage range -10 V to 10 V -10 V to 10 V
Output SMA female connector SMA female connector
Power supplies
Positive supply voltage 11.5 V to 13 V (12 V nominal) 11.5 V to 13 V (12 V nominal)
Negative supply voltage -13 V to -11.5 V (-12 V nominal) -13 V to -11.5 V (-12 V nominal)
Quiescent current 20 mA per rail 20 mA per rail
Maximum current 75 mA per rail 75 mA per rail
Other
Outside dimensions 60 mm x 49 mm x 18 mm 60 mm x 49 mm x 18 mm
Operating temperature 0 °C to 50 °C 0 °C to 50 °C
Weight 43 g 43 g

More Photodetectors

Functional diagram

PD4Q functional diagram

Characterization

Output noise

The figure below shows the X output (X = (A+D)-(B+C)) power spectral density, with and without light. The optical source is a 810 nm LED driven by a Koheron DRV110-A-375 laser driver.

PD4Q-10k Output power spectral density
PD4Q-10k Output power spectral density
PD4Q-100k Output power spectral density
PD4Q-100k Output power spectral density

Frequency response

The figure below shows the frequency response of the PD4Q photodetector.

PD4Q frequency response

Noise Equivalent Power

The figure below shows the Noise Equivalent Power of the PD4Q photodetector 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

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Ordering codes

REFERENCE ATTRIBUTE
PD4Q-10k Transimpedance gain 10 kV/A
PD4Q-100k Transimpedance gain 100 kV/A

Export information

REFERENCE COUNTRY OF ORIGIN HS CODE HTSUS ECCN
PD4Q-10k France 85414900 8541499500 EAR99
PD4Q-100k France 85414900 8541499500 EAR99

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