Molecular Vista
4 - quadrant photo detectors PD1 and PD2
Description:
The small board with soldered PD IC can be mounted into home-built
AFM or SNOM set-up's. The sensitivity is optimized for 2 mW lasers at
670 nm wave length. It can be changed in dependence on the costumers
requirements. The housing of the PD is on ground potential. We provide
the blank board with 4 mm laboratoy connectors for the power supplyand
with BNC connectors for the signals. As the application can need different
band width or smaller noise, we make costumer specific boards. The full data sheet is
provided.
Basic Data:
voltage supply: 12V
detector type: QD7-5 (R&S 652 027)
amplification: 47 kOhm
outputs:4 x BNC
Properties of the Photo Diode:
| active diameter: | 3 mm |
| active area: | 7 mm*mm |
| inactive spacing: | 0,2 mm |
| sensitivity: | 0,5 A/W (typ.) |
| wave length for maximum sensitivity: | 820 nm |
| spectral range: | 430 nm ... 900 nm |
| dark current (VR = 1 V): | 0,03 nA typ., 3 nA max. |
| capacitance: | 80 pF (Vs = 0 V) |
Electronic Board:
typical applications
laser deflection for displacement detection
(AFM, SNOM, micromechanics)
| type: | current voltage converter |
| amplification: | typical: 10 V/mA (10 kOhm) |
| band width: | > 300 kHz |
| output noise: | < 10 mVpp |
| dimensions: | 15 mm x 26 mm |
typical applications
laser deflection for displacement detection
(AFM, SNOM, micromechanics)
There are two types:
PD 1
PD 2
T = Top, B = Bottom, L = Left and R = Right, or TL = Top-Left.