Nonlinear Crystals: POM
Nonlinear Crystals: POM
Description
POM (Potassium Dihydrogen Phosphate or KDP) is a widely used nonlinear crystal in laser technology for frequency doubling and optical parametric amplification. It has a relatively high nonlinear coefficient, wide transparency range, and good thermal and mechanical properties, making it a popular choice for many applications.
In frequency doubling, POM is used to convert a laser beam from one frequency to another by doubling its frequency. This process can be used to generate laser light in the ultraviolet region, which is useful for many applications such as spectroscopy, microscopy, and material processing.
POM can also be used for optical parametric amplification, where it is used to amplify laser pulses at a specific frequency range by transferring energy from a pump beam. This process is used for applications such as ultrafast laser systems and nonlinear optics.
POM has a relatively high damage threshold, good thermal and mechanical properties, and is relatively easy to grow and process, making it a popular choice for many laser applications. However, it is susceptible to photorefractive damage, where the crystal structure is altered by exposure to laser radiation over time, which can limit its lifetime and usefulness in some applications.
| Transparency range, nm | 440 - 2300 |
| Symmetry | orthorhombic |
| Point group | 222 |
| Lattice parameters, Å | a = 21.359; b = 6.111; c = 5.132 |
| Density, g/cm3 | 1.55 |
| Non-linear coefficient, pm/V | d = 9.7 |
| Acousto-optical properties, MKS | 5.4 x 10-13 |
| Absorption coefficients, cm-1 | |
| 1064 nm | 0.05 |
| 532 nm | 0.2 |
| Refractive indexes: | |
| at 1064 nm | nx = 1.625; ny = 1.663; nz = 1.829 |
| at 532 nm | nx = 1.660; ny = 1.75; nz = 1.997 |
| Conversion efficiency, % | 20 (1.32 µm, 10 ns, 10 MW/cm2, L = 4 mm) |
| 25 (1.064 µm, 20 ns, 50 mJ) | |
| Optical damage threshold, GW/cm2 | |
| 1060 nm, 15 ns | 2 |
| 530 nm, 15 ns | 0.075 |
| 530 nm, 25 ps | 270 |
| Chemical properties | slightly volatile |
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