Nonlinear Optical Crystals

KDP & DKDP Crystals BBO Crystals LBO Crystals BIBO Crystals LiNbO₃ Crystals LiIO₃ Crystals ZGP Crystals RTP Crystals KTP Crystals KTA Crystals HGS Crystals AGS Crystals

Nonlinear Optical (NLO) Crystals: Your Complete Source for Frequency Conversion Solutions

Welcome to the heart of photonic innovation. As a premier provider of high-quality optical materials, Alfa Chemistry is proud to offer the industry's most extensive range of nonlinear optical (NLO) crystals.

The core of your system's performance lies in choosing the right crystal. Each family has its distinct set of properties – from transmission range, to nonlinear coefficient, to damage threshold and phase-matching capabilities.

Browse Our Full Spectrum of NLO Crystals

UV to Visible Range Crystals

Ideal for generating and manipulating shorter wavelengths with high precision.

BBO Crystals (β-BaB₂O₄): The benchmark for deep UV generation. Renowned for its wide transparency range (189 nm - 3500 nm), high damage threshold, and excellent UV performance for SHG, THG, and FHG of Nd:YAG lasers.
LBO Crystals (LiB₃O₅): Known for its large damage threshold, wide acceptance angle and small walk-off. Excellent for high-power frequency doubling and OPOs pumped by Nd:YAG lasers.
BIBO Crystals (BiB₃O₆): Features a very high nonlinear coefficient, making it exceptionally efficient for frequency conversion processes like SHG and THG, particularly in the visible and near-IR spectrum.
KDP & DKDP Crystals (KH₂PO₄ & KD₂PO₄): Classic crystals for electro-optic Q-switching and large-aperture frequency conversion systems, especially for high-power laser applications.

Visible to Near-IR Range Crystals

The workhorses for telecom, spectroscopy, and laser systems.

KTP Crystals (KTiOPO₄): One of the most popular crystals for SHG of Nd:YAG lasers (1064 nm to 532 nm) and OPOs. Offers a large nonlinear coefficient and excellent physical stability.
KTA Crystals (KTiOAsO₄): As a versatile alternative to KTP, KTA offers improved damage resistance in some regimes, ideal for OPOs extending further into the mid-IR.
RTP Crystals (RbTiOPO₄): A relative of KTP that offers superior electro-optic coefficients, making it a premier choice for high-frequency, low-voltage Pockels cells and Q-switches.
LiNbO₃ Crystals: An extremely versatile material used extensively in electro-optics (modulators, Q-switches), nonlinear optics (periodically poled for Quasi-Phase-Matching), and integrated photonics.
LiIO₃ Crystals: Have a large nonlinear coefficient and wide acceptance angle. Commonly used for SHG of lower-power lasers.

Mid to Long-Wave Infrared (IR) Crystals

Unlock the potential of the infrared spectrum for sensing and spectroscopy.

ZGP Crystals (ZnGeP₂): The high-power champion for mid-IR OPOs and OPAs. Offers an extremely high nonlinear coefficient and transparency from 2-8 μm, ideal for pumping with Ho:YAG or Tm-fiber lasers.
AGS Crystals (AgGaS₂): A proven material for mid-IR applications with a broad transparency range (0.5-11 μm). Excellent for frequency doubling CO₂ lasers and OPOs pumped by Nd:YAG lasers.
HGS Crystals (HgGa₂S₄): Features a very wide transparency range (0.55-13 μm) and is a powerful competitor for mid-IR generation, particularly in tunable OPO systems.

Customization & Value-Added Services

We support research labs and OEMs with a full set of finishing service:

Custom crystal orientation, AR coatings, and cut angles for specific phase-matching.
Precision polishing (flatness, parallelism, surface quality) and beveling.
Anti-reflection and protective coatings tuned to your wavelength(s).
Visual inspection, interferometry, spectral/transmission testing, and custom certification reports are available.
Small-lot prototyping through high-volume supply agreements.