Scattering measurement and Laser power issue

Abe, Dan Chen

We try to measure the laser power using power meter.
We find that laser power is too low comparing spec sheet.
We use laser diode "L520P50".

We inject 124mA.
According to spec sheet, laser power is 50mW.
However, laser power is almost 10mW.
And laser shape is bad and not collimated with collimator lens.


Because the ratio scattering light and inject power is most important, we try to measure scattering of Aztec#3.
Laser power is,
Before iris:8.15mW
After sample:4.55mW
Reflection light:415uW+331uW(415uW is front surface)

In this figure, scattering light is in the yellow box.(Blue box is reflection light by mirror surface)