KTiOPO4

Potassium titanyl phosphate, with the chemical formula KTiOPO4, often abbreviated as KTP, is a synthetic, non-linear optical crystal. It is known for its high optical damage threshold, wide transparency range, and significant nonlinear optical coefficients, making it valuable in various laser applications. KTP crystallizes in the tetragonal system. It is transparent from approximately 350 nm to over 4000 nm. Its primary use is as a frequency doubling material for solid-state lasers, particularly for converting the output of near-infrared lasers, such as Nd:YAG lasers, into visible green light. This process, known as second-harmonic generation, is crucial for many laser systems used in scientific research, industrial processes, and medical devices. KTP also exhibits a high refractive index and good photorefractive properties. The crystal is typically grown using a flux method, which allows for the production of large, high-quality single crystals. Due to its excellent nonlinear optical properties and robustness, KTP has become a standard material in many laser systems requiring efficient frequency conversion. It is also used in optical parametric oscillators (OPOs) and optical parametric amplifiers (OPAs).