KDP (Potassium Dihydrogen Phosphate) is a nonlinear crystal widely used in various applications, particularly in high-power laser systems for frequency conversion, harmonic generation, and optical parametric amplification. KDP has a high nonlinear coefficient, wide transparency range, and good optical, mechanical, and thermal properties, making it a popular choice for many laser applications.
In frequency conversion, KDP is used to convert the frequency of laser light by doubling, tripling or quadrupling its frequency. This process is important for generating laser radiation at wavelengths that are not directly available from laser sources, such as ultraviolet (UV) or deep ultraviolet (DUV) light. KDP is also used for harmonic generation in laser-based atomic physics experiments, and as a nonlinear element in optical parametric amplification systems.
KDP crystals have a relatively high damage threshold, which makes them suitable for use in high-power laser applications. They also have good optical properties, including a high refractive index, high birefringence, and low absorption in the visible and near-infrared regions. However, KDP is susceptible to photorefractive damage, which can limit its useful lifetime in some applications.
|Transparency range, µm||0.174 - 1.57|
|Lattice parameters, Å||a=b=7.453; c=6.975|
|Refractive index at 407.8 nm :||no=1.52301; ne=1.47898|
|at 632.8 nm||no=1.50737; ne=1.46685|
|at 1064 nm||no=1.4938; ne=1.4599|
|Non-linear coefficient at 1.064 µm, pm/V||d36 = 0.39|
|Optical damage threshold, MW/cm2||300 - 600 (1064 nm, 20 ns)|