KTP
KTP crystal is mostly used as nonlinear crystals for frequency doubling of solid-state Nd:YAG crystal or Nd:YVO4 crystal laser, as it has large nonlinear optical coefficients, wide angular bandwidth and small walk-off angle, broad temperature and spectral bandwidth. KTP crystal also has high electro-optic(E-O) coefficient and low dielectric constant, and large figure of merit, these features make it also widely used in electro-optic application
Advantages
Large Nonlinear Optical (NLO) Coefficients
Wide Angular Bandwidth and Small Walk-off Angle
Broad Temperature and Spectral Bandwidth
High Electro-Optic (E-O) Coefficient and Low Dielectric Constant
Large Figure of Merit for an Optical Waveguide Modulator
Nonhygroscopic, Good Chemical and Mechanical Properties
Capabilities:
| Aperture: | 2x2 ~ 10x10mm |
| Lenght: | 0.1 - 20mm |
| Cutting Angle q and f: | Determined by different kinds of homonic generartion |
| Phase matching type: | Type I or Type II |
| End Configuration: | Plano/Plano or Brewst/Brewst or Specified |
Specifications:
| Angle tolerance: | Δθ< ± 0.5°; Δφ< ±0.5° |
| Dimensional Tolerance: | (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) |
| Flatness: | <λ/8 at 633nm |
| Surface Quality: | 10/5 Scracth/Dig |
| Parallelism: | < 20 arc seconds |
| Perpendicularity: | < 5 arc minutes |
| Wavefront Distortion: | <λ/8 at 632.8nm |
| Clear Aperture: | Central 95% |
| Chamfer: | 0.15x45° |
| Coating: | a) * S1,S2: AR @ 1064 nm R<0.1% & 532nm R<0.25% b) * S1:HR @ 1064nm R>99.8% & HT@ 808nm T>95% S2:AR @ 1064 nm R<0.1% & 532nm R<0.25% |
Properties:
| Transmitting range | 350nm~4500nm | |||
| Refractive indices | - | nx | ny | nz |
| 1064nm | 1.7377 | 1.7453 | 1.8297 | |
| 532nm | 1.7780 | 1.7886 | 1.8887 | |
| Absorption coefficients | a < 1%/cm @1.064µ m and 0.532µ m | |||
| Phase matchable range | 0.984 - 3.4 µ m | |||
| Therm-optic coefficients | dnx/dT=1.1x10-5/°C, dny/dT=1.3x10-5/oC, dnz/dT=1.6x10-5/°C | |||
| Nonlinear optical coefficients | d31=2.54pm/V, d31=4.35pm/V, d31=16.9pm/V d24=3.64pm/V, d15=1.91pm/V at 1.064 mm deff(II)≈ (d24 - d15)sin2fsin2q - (d15sin2f + d24cos2f)sinq |
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| Electro-optic coefficients | - | Low frequency(pm/V) | High requency(pm/V) | |
| g13 g23 g33 g51 g42 |
9.5 15.7 36.3 7.3 9.3 |
8.8 13.8 35.0 6.9 8.8 |
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| Dielectric constant | eeff=13 |
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Sellmeier equations
nx2=3.0065+0.03901/(l2-0.04251)-0.01327l2
ny2=3.0333+0.04154/(l2-0.04547)-0.01408l2
nz2=3.3134+0.05694/l2-0.05658)-0.01682l2