Laser power meters are an essential equipment for anyone working with lasers. It will be capable of measuring powers from 10s of nW to 10s of mW. To make a precision power meter, two issues need to be concerned carefully. First, the large dynamic range of power is the primary challenge to designing the instrument. Second, the photo sensitivity (A/W) of photodiode is dependent on wavelength, so a tight calibration for full spectral response is another challenge.
Home-built laser power meters, 1st version
Details:
- Open source Arduino UNO, C language
- 16 bit ADC with ADS1115, I2C
- 128 x 64 OLED display, SH1106 , I2C
- Silicon photodiode (300-1000 nm), diameter 5 mm
- Photiode TIA design
Circuit design and performance test
Update time: 2021-11-19