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We report on a new monolithic high-power diode pumped Er:YAG solid state laser at 2.94 µm. The pulsed laser reaches 30 W average output power and 150 mJ pulse energy. To accomplish these high powers the thermal lensing of Er:YAG was modeled beyond ABCD matrix formalism with FEM simulations. With the well understood thermal lensing effect alternative laser cavities have been designed for higher brightness. The predicted results fit the theoretically simulated performance and with that an improved beam quality factor of M 2 = 12 has been achieved with 100 mJ pulse energy.

A high power, diode-pumped Er:YAG laser platform is presented, which has been integrated into devices for soft as well as hard tissue applications. The highly efficient side pumping by qcw laser diodes allows easy power scalability and miniaturization proven by a portable fractional ablative laser system based on a 2 W laser. The high repetition rate of up to 1 kHz combined with low energy pulses generates high thermal impact and consequently strong skin rejuvenation. Furthermore a laser for hard tissue applications with up to 15 W average output power at repetition rates up to 2 kHz is presented. The good beam quality allows coupling to 200 µm fibers and the variable pulse duration of 1 to 200 µs ensures precise and fast treatments.

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