The quality of the die bonding is critical to the operation and reliability of the laser diodes since it can affect the
electrical, thermal, and optical properties of the device. We investigated the effect of mounting induced strain and
defects on the performance of high power laser. In this paper measurements of the temperature distribution, the
spontaneous emission spectrum and the electroluminescence along the cavity of quantum well lasers are presented. The
electro-optical parameters of the high output power laser diodes, such as emission wavelength, output power, threshold
current, slope efficiency, and operating lifetime are presented too. In the experiment, high power diode lasers emitting in
808 nm and 880 nm- range are investigated. We have observed that defect lines tend to create in areas where temperature
gradients were observed in thermovision measurements.