Goth, KatharinaKatharinaGothGriesbeck, MichaelMichaelGriesbeckRupp, MariusMariusRuppEitner, MadeleineMadeleineEitnerEichhorn, MarcMarcEichhornKieleck, ChristelleChristelleKieleck2023-09-072023-09-072023https://publica.fraunhofer.de/handle/publica/45038410.1109/cleo/europe-eqec57999.2023.10231704Laser light from Ho 3+ : YAG crystals in the 2 μm range has a variety of applications like remote sensing, medical applications, or the pumping of optical parametric oscillators for the generation of mid-infrared radiation. When working with this quasi-three-level laser material, a high pump intensity is required which can be generated in an end-pumped design. However, such a design leads to a large longitudinal temperature gradient resulting from the exponential absorption of the pump light. One approach to decrease the temperature peak at the front of the crystal and therefore reduce temperature-induced stresses in the crystal is the use of diffusion-bonded crystals consisting of multiple segments with increasing doping concentrations along the crystal axis [1].enconference paper