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LilO3 Crystal

POC-OC-122413-LilO3 Crystal

  • Wide transparency range from 300 nm to 5000 nm.
  • High nonlinear optical coefficient (d15 = -5.5 × 10^-12 m/V).
  • Negative uniaxial refractive indices for improved optical performance.
  • Suitable for frequency-doubling, tripling, and mixing applications.
  • Available in polished or as-cut formats with AR-coated options.

Customizable Components Available for This Material to Meet Your Specific Needs!

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General Description

Lithium Iodate (LiIO3) is one of the oldest commercial nonlinear optical (NLO) crystals, widely recognized for its high nonlinear coefficient and broad transparency range. It is used extensively in frequency-doubling, tripling, and laser mixing applications, particularly for low and medium power laser systems. Its hexagonal structure and excellent optical homogeneity make it ideal for critical laser components. However, LiIO3 is highly hygroscopic and requires dry storage and sealed housing for extended durability. Photonics On Crystals (POC) ensures high-quality fabrication to meet industry standards for precision optics.

General Applications and Examples

  1. Frequency-Doubling and Tripling
    LiIO3 crystals are extensively used in frequency-doubling and tripling processes for lasers operating in the UV and visible ranges. This capability is especially valuable in laser spectroscopy and bioimaging applications.
    Example: Conversion of a 532 nm laser to 266 nm for biomedical imaging.
  2. Laser Mixing Applications
    The high nonlinear coefficient makes LiIO3 a preferred choice for laser mixing in low to medium power setups, enabling a variety of wavelength combinations for research and industrial applications.
    Example: Generating 355 nm output from 1064 nm and 532 nm lasers.
  3. Optical Parametric Oscillators (OPOs)
    LiIO3 is also used in OPO systems due to its wide transparency range and excellent phase-matching properties.
    Example: Generating tunable wavelengths for spectroscopy and telecommunications.

Chemical and Structural Properties

PropertyValue
Crystal StructureHexagonal, Point Group 6
Transparency Range300–5000 nm
Nonlinear Coefficient (d15)-5.5 × 10^-12 m/V
Refractive Indicesnₒ = 1.8571, nₑ = 1.7165 (at 1064 nm)

Optical and Nonlinear Optical Properties

PropertyValue
Transparency Range (nm)300–5000
Refractive Indices (1064 nm)nₒ = 1.8571, nₑ = 1.7165
Nonlinear Coefficient (d15)-5.5 × 10^-12 m/V
Sellmeier Equation (nₒ)n² = 3.415716 + 0.047031 / (λ² – 0.035306) – 0.008801
Sellmeier Equation (nₑ)n² = 2.918692 + 0.035145 / (λ² – 0.028224) – 0.003641

Standard Fabrication Specification

SpecificationValue
Dimension Tolerance (mm)W ± 0.2 × H ± 0.2 × L + 0.5 / -0.2
Clear ApertureCentral 90% of the diameter
Surface Quality (Scratch/Dig)20/10 to MIL-PRF-13830B
Flatnessλ/4 @ 633 nm
Transmitted Wavefront Distortionλ/4 @ 633 nm
Parallelism< 30 arc sec
Perpendicularity≤ 15 arc min
Angle Tolerance (°)Δθ ≤ 0.5
Quality Warranty PeriodOne year under proper use

Spectrum Transmission Curve

Spectrum transmission curves for LiIO3 crystals can be provided upon request, showcasing their excellent UV and visible light transmission characteristics.

Coating Specification

  • AR Coatings: Anti-reflective coatings available for specific wavelengths upon request.
  • Customization: Custom coatings (e.g., BBAR, HR) are available for diverse applications.
  • Adhesion Test: Compliant with MIL-C-675C military standards, an adhesion test involved applying a tape that meets LT-90 specifications onto the lens film layer. The tape was affixed fully and then removed vertically. This procedure was performed three times, resulting in no blistering or peeling.
  • Temperature Test: In line with MIL-C-675C specifications, test pieces were subjected to temperatures of -62±1℃ and 71±1℃. After maintaining them at room temperature (16℃~32℃) for two hours, the adhesion test was repeated, confirming no film detachment.
  • Abrasion Resistance Test: Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance test involved a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) to the film. This was repeated 25 times with gauze widths of 1/4 inch (6.4mm) and 3/8 inch (9.5mm), ensuring no damage occurred to the film surface.
  • Humidity Test: Under MIL-C-675C criteria, the test piece was placed in a controlled temperature and humidity chamber set to 49 ±2℃ and 95%~100% humidity for 24 hours. The film remained intact, with no peeling, scratches, or other defects.
  • Solvent and Cleaning Testing: Following MIL-C-675C specifications, test pieces were exposed to room temperature conditions (16℃~32℃) and tested with acetone and alcohol for at least 10 minutes each. After air drying and subsequent cleaning with a cotton cloth soaked in alcohol, the film surface showed no signs of peeling or scratches.
  • Salt Spray Test: After 100 hours in a 35°C environment with a 5% saltwater concentration, the film showed no signs of damage.
Product CodeDimensions (mm)CoatingApplication
POC-LiIO3-532-1010 × 10 × 10AR @ 532 nmFrequency Doubling
POC-LiIO3-266-1212 × 12 × 12AR @ 266 nmTripling
POC-LiIO3-CustomCustomizableOn RequestAll Applications

POC-OC-122413-LilO3 Crystal

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