Abstract
Periodically poled crystals from the KTiOPO4 (KTP) family are popular for nonlinear conversion processes, including frequency doubling from the near infrared to the visible spectral region. Like in most nonlinear materials, high intensities of visible radiation induce absorption centers, which can reduce the transmission of visible light, so called “gray-tracks”, and also increase unwanted absorption in the infrared. In periodically poled structure the induced infrared absorption affects the conversion efficiency due to thermal dephasing. As the growth technology of KTP isomorphs advances and the periodic poling technology have been demonstrated for all available isomorphs used for frequency conversion, it is important to investigate the susceptibility to color center formation in currently available isomorphs, KTP, RbTiOPO4 (RTP), RbTiOAsO4 (RTA) and the more recently developed Rb:KTP and low-conductivity KTiOAsO4 (KTA). For instance recent results of high-CW power green-light generation and high-peak power blue-light generation using periodically poled structures would indicate that KTA and Rb:KTP have a lower degree of color center formation compared to the standard flux-grown KTP and higher powers can hence be generated [1, 2].
© 2015 IEEE
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