Semiconductor lasers operating at 808nm wavelength have found widespread use in many industrial and defense settings, often operating in harsh environments. An example is a demanding Aerospace application where they are used to pump a solid state laser. Here, the lasers and array packages must be capable of operating reliably and efficiently at elevated temperatures, survive large temperature swings (-60 to 100 C), and high vibration environments.
We have developed a rugged and compact conductively cooled ten bar array utilizing bars optimized to meet these requirements. This array provides peak powers in excess of 950 W under specified operating conditions of 0.5% duty cycle at 45C. Threshold currents of 15A, slope efficiencies of 12.8 W/A and power conversion efficiencies (PCE) as high as 60% are realized at this temperature. Spectral widths of 2.5 nm FWHM are typical for this package. The array is built using only hard solder and materials CTE matched to GaAs.