Lithium Thioindate LiInS2 Non-linear Optical Crystal
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since 2022
Description
Lithium Thioindate (LiInS2 or LIS) is a remarkable ternary semiconductor known for its unique crystallization with mm2 symmetry. This advanced material boasts a large nonlinear optical (NLO) coefficient, positioning it closely alongside other notable compounds such as AgGaS2 and AgGaSe2, albeit with distinct crystal structures. One of the standout features of LiInS2 is its high laser damage threshold, coupled with a broad transparent wavelength range.
The transparency range of LiInS2 spans from 0.5 to 8 μm, making it an exceptional choice for mid-infrared NLO applications. Additionally, LiInS2 is pyroelectric, and its electro-optical parameters make it an effective material for various electro-optical applications. The ability to achieve three-frequency collinear phase matching, along with its large birefringence and low absorption in the THz frequency region, further enhances its potential as a superior optical nonlinear material compared to similar compounds like LiGaO2.
LiInS2's unique properties make it an invaluable asset in the field of nonlinear optics. Its large nonlinear optical coefficient and high laser damage threshold enable it to perform efficiently in demanding environments. The wide transparency range enhances its versatility, allowing it to be used in a variety of optical applications. Furthermore, its pyroelectric nature and favorable electro-optical parameters open up possibilities for innovative uses in electro-optical devices. The combination of these characteristics positions LiInS2 as a leading material in the development of advanced optical technologies.
Lithium Thioindate LiInS2 Non-linear Optical Crystal
Specifications |
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|---|---|
| Crystal Type: | AgGaS2 (Silver Gallium Sulfide) |
| Phase Mathcing Type: | Not Applicable |
| Mounting: | Unmounted |
| Width: | 8 mm |
| Height: | 5 mm |
| Length: | 5 mm |
| Flatness: | <= Lambda/4 |
| Surface Quality (Scratch-Dig): | 20-10 |
| AR Coating: | Both Sides |
Features
- High Nonlinear Optical Coefficient: Lithium Thioindate (LiInS2 or LIS) boasts a large nonlinear optical (NLO) coefficient, comparable to AgGaS2 and AgGaSe2, making it ideal for advanced optical applications.
- Wide Transparency Range: The crystal offers a broad transparency range from 0.5 to 8 μm, making it an excellent choice for mid-infrared NLO applications.
- High Laser Damage Threshold: LiInS2 can withstand high laser intensities, ensuring durability and reliability in demanding environments.
- Pyroelectric and Electro-Optical Properties: The material's pyroelectric nature and electro-optical parameters make it effective for various electro-optical applications.
- Three-Frequency Collinear Phase Matching: LiInS2 supports three-frequency collinear phase matching, enhancing its versatility in optical systems.
- Low Absorption in THz Frequency Region: With low absorption in the THz frequency region, LiInS2 is a potentially more useful optical nonlinear material than LiGaO2.
Applications
- Up-conversion of CO₂ Laser Radiation: Converts CO₂-laser outputs into near-IR or visible regions.
- Mid-IR Frequency Generation: Enables efficient frequency conversion within the 2–12 μm range.
- Optical Parametric Oscillators (OPOs): Supports tunable sources in the 1–12 μm range using Ti:sapphire or Nd:YAG lasers.
- Frequency Mixing in Mid-IR: Provides high efficiency for frequency mixing applications in the mid-infrared spectrum.
- Broadband Mid-Infrared Amplification: Suitable for advanced mid-IR optical parametric amplification systems.
Frequently Asked Questions
Lithium Thioindate (LiInS2 or LIS) is a ternary semiconductor with mm2 symmetry, known for its large nonlinear optical coefficient and high laser damage threshold. It is used as a mid-infrared nonlinear optical crystal.
The transparency range of LiInS2 is from 0.35 to 12.50 micrometers, making it suitable for mid-infrared applications.
LiInS2 is used for up-conversion of CO2-laser radiation, different frequency generation in the middle IR range, optical parametric oscillators, frequency mixing in the middle IR region, and broadband mid-infrared optical parametric amplification.
LiInS2 has a density of 3.5 g/cm3, Mohs hardness of 5, and is non-hygroscopic. It has specific refractive indexes and a non-linear coefficient, and it can withstand an optical damage threshold of approximately 1 GW/cm2 at 1064 nm.
LiInS2 has a large nonlinear optical coefficient similar to AgGaS2 and AgGaSe2 but with different crystal structures. It also has a high laser damage threshold and a wide transparency range, making it potentially more useful than LiGaO2.
No, LiInS2 is non-hygroscopic, meaning it does not absorb moisture from the air.
At 0.532 μm, the refractive indexes are nx= 2.1305, ny= 2.1668, nz= 2.1745. At 1.064 μm, they are nx= 2.2353, ny= 2.2841, nz= 2.2919.