Spatially resolved self-heating and thermal impedance of laser diodes using CCD-TR imaging

The spatial distribution of the surface temperature single and multi-section slotted semiconductor laser diodes with gratings is investigated experimentally CCD-thermoreflectance imaging. lasers are frequency devices, operating at approximately 1550 nm. High resolution maps ridge obtained, near 1 µm. profile in direction lateral to presented a rapid decay away from observed. Acquisition takes about 8 minutes, three required for 400 µm device. rise shown be linear power consumed by diode. along uniform within section laser. thermal impedance various sections were determined. It was found that length product ( Z th L ) 40 ± 6 ° C µm/mW all lengths. Between also