title: Thermal optimization of second harmonic generation at high pump powers.
abstract: We measure the temperature distribution of a 3 cm long periodically poled LiNbO₃ crystal in a single-pass second harmonic generation (SHG) setup at 488 nm. By means of three resistance heaters and directly mounted Pt100 sensors the crystal is subdivided in three sections. 9.4 W infrared pump light and 1.3 W of SHG light cause a de-homogenized temperature distribution of 0.2 K between the middle and back section. A sectional offset heating is used to homogenize the temperature in those two sections and thus increasing the conversion efficiency. A 15% higher SHG output power matching the prediction of our theoretical model is achieved.
authors: Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany. Alexander.Sahm@FBH-Berlin.de
authors: Alexander
authors: A
authors: Sahm
authors: Mirko
authors: M
authors: Uebernickel
authors: Katrin
authors: K
authors: Paschke
authors: Götz
authors: G
authors: Erbert
authors: Günther
authors: G
authors: Tränkle