The results of investigations of the matrix of powerful laser diodes (MLD) with quantum well active layer are discussed in this report. Along with creation of MLD with the given parameters and the high operation resource the supply and control electronics units, including the thermostabilizing, ensuring reliable functioning of the semiconductor laser module, were developed.
The matrix of laser diodes SLMP-6NP-845N was produced by JSC “Inject” (Russia) based on AlGaAs/GaAs heterostructure. The MLD lasing wavelength is in the vicinity of 846 nm. The spectral width of radiation is 6 nm. The operation temperature is of 30 ± 0.5 °C.
The mirror sides of crystals of laser diodes (cavity mirrors) were created by the method of electron beam evaporation in vacuum. The received reflection coefficients are 25% and 98% for output and high reflective mirrors, respectively.
The pulse front of the laser radiation of the MLD reaches 83% of its maximum intensity for the first 12 ns and 100% for 30 ns. At the stage of its switching off, intensity sharply falls approximately through 15 ns. The described behavior is realized for pulses with duration from 35 to 100 ns. Maximal average power of the laser radiation of MLD linearly increases with increase in pulse repetition rate.
Temperature on the matrix surface and heat sink temperature differs on 5ºC that demonstrates stable operation of elements of Peltye. However the main contribution to heat-up of the heat sink and air was entered by two resistors connected to both stacks of the matrix sequentially, but this fact doesn't influence on stable operation of the module of laser illumination.
Thus, for effective operation of illumination module based on matrix of powerful laser diodes it is necessary to decrease the temperature gradient near the MLD, which can be done by mounting the resistors and matrix on a general radiator using external culling such as element of Peltye. It was ascertained that an increase in radiation pulse repetition rate from 0.5 to 10 kHz and corresponding change of the power operation mode doesn't influence on the divergence of output radiation of the MLD.
