PPKTP – Periodically poled potassium titanyl

• Does not suffer from photorefraction and features a high damage threshold.
• Enables phase matching across the entire 400–3500 nm wavelength range.
• High nonlinearity (>10 pm/V @ Type 1, SPDC 400->800 nm)
• Among the best options for green or red light generation, especially when CW or low-power sources are used.
• High Gray-Track Resistive (HGTR) materials are used for best performance.
• High-damage-threshold coatings allow pumping with significantly higher intensities compared to other periodically poled materials.
• IBS coatings with low absorption around 3μm.
• Laser-grade surface with low roughness available for: plano, wedged, or convex (ROC > 5 mm).
• Small poling periods could be reached down to 2μm.

• PPKTP crystals with lengths of 20–30 mm may be more prone to side-surface chiping, so extra care is required.
• During the poling process, the structure of KTP is modified, which may lead to a reduction in the material’s nonlinear coefficient.
• High CW powers still may rise Gray-Tracking effects @ 532 nm or lower wavelenghts.

• SPDC, nth-HG, SFG, DFG frequency conversions, including 400->800 nm, 775->1550 nm or 1064->532 nm
• Light squeezing or spectral narrowing
• Optical parametric amplifiers, oscillators, generators for visible spectrum to mid-infrared with tunable output

3photon offers the following PPKTP crystals:

• Standard aperture of 1×6 mm (W×H), with lengths up to 30 mm; custom apertures available upon request
• Laser-grade surface processing: plano, wedged, or convex (ROC > 5 mm)
• Poling periods greater than 2μm
• Custom-designed ovens to maintain the crystal at optimal operating temperatures
• Coating, polishing, and mounting services available upon request to ensure optimal performance

3photon standard IBS coatings examples:

S1/S2: AR(R<0.1%) @ 1064 + AR(R<0.5%) @ 532 nm, AOI = 0 deg

S1/S2: AR(R<0.35%) @ 1600 + 800 nm, AOI = 0 deg

S1/S2: AR(R<0.35%) @ 1550+775 nm, AOI = 0 deg

S1/S2: AR (R<0.5%) @ 760-800 + AR (R<0.5%) @ 1520-1600 nm, AOI = 0 deg

S1/S2: AR (R<1%) @ 1990 + AR (R<0.65%) @ 995 + 663 nm, AOI = 0 deg

• 3photon’s unique IBS (Ion Beam Sputtering) system enables high-precision coating of nonlinear crystals. This results in superior performance compared to e-beam coatings, while simultaneously enhancing the quality, effectiveness, laser damage threshold and reduces absorption around 3μm.
• LIDT conditions: Wavelength: 1064 nm; Pulse duration: 10 ns;1 – on – 1
  

  ID#, J/cm²	LID def.	LID max.
  KTP	59.7	101.3

• Custom coatings are also available upon request.