Photodetector with wavelength @ 780nm and 1560nm

Photodetector with wavelength @ 780nm and 1560nm

Team members: Sunke Lan

To design photodetector as power monitor with power within 10mW.

Project Outline

1. Objective

• 1.1 Try to design photodetector for 780nm and 1560nm
• 1.2 Measure optical power up to 10mW( depends on which light we will measure finally) to stabilize the intensity of laser

2. Components

• 2.1 Photodiodes (S5917, G12180-010A), BNC test boards, PCB test boards, op-amp (OP27G) (for target 1)
• 2.2 Oscilloscope, Rotation Mount with Resonant Piezoelectric Motors(ELL 14K), SHG optical system (for target 2)

3. Design Considerations

• 3.1.1 Basic current-voltage transferring circuit for S5971

File:Reference circuit.png

Circuit for 780nm Photodetector

Based on the reference circuit, we changed the biase voltage of photodiode to 1V, and used op-amp OP27E to do the current-voltage transferring.