High-brightness passively Q-switched micro-lasers with sub-ns duration could be used for applications such aslaser ignition or terahertz generation and can provide several mJ pulses to the user. To scale-up the output fromsuch laser, additional Master Oscillator Power Amplifier (MOPA) system is necessary. This will increase both thesize and price of the setup. Additionally, if the repetition rate to be increased, heat generation inside the activemedia will cause severe thermal lens and birefringence loss. To avoid these severe effects, another approach forlaser cavity design is required. Recently, it became possible to make a periodic structure consisting of transparentheatsink and active laser media. Materials like Sapphire or Diamond could be contacted to Nd3+:YAG crystal in aconsecutive pattern for removing heat generation. Combination of several units of these crystal pairs will produceso called Distributed Face Cooling (DFC) chip. Optimization of this design can help to withstand high averagepowers with the change of several parameters such as thickness of both gain and heatsink material, pump laserwavelength, doping of gain crystal, etc.
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