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Good discussions. It is not a simple question, because the optimum dopig level depends on the output power level, mode quality (multimode, low order mode or TEM00 mode), pumping and cooling geometry, laser crystal size, and the crystal material. Most of the opinion above are valid, you can take them into account when you design a laser, but you need to figure out the optimum doping for your laser by carrying out some experiments. I think you only need to try maximum three diferent doping to find the best one. You should always remember that the laser theory is simple, but there are endless engineering work to make a good laser. Good luck! |