In the nonlinear optical crystal, BBO crystal is a kind of crystal with obvious comprehensive advantages and good performance. It has a very wide light transmission range, a large matching angle, a high resistance to light damage threshold, and a broadband temperature matching. Excellent optical uniformity, especially for the triple frequency of Nd:YAG lasers.

Potassium Dihydrogen Phosphate (KDP) and Potassium Deuterium Phosphate (KD*P) are among the most widely-used commercial NLO materials. They are commonly used for doubling, tripling and quadrupling of Nd:YAG laser at the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro- optical modulators, Q-switches, and Pockels Cells, etc.

CrZnS and CrZnSe laser crystals typically do not exhibit excited-state absorption or upconversion. They possess an extremely broad absorption band, a large emission cross-section, excellent fluorescence quantum efficiency at room temperature, an ultra-wide emission bandwidth, as well as good chemical and mechanical properties. These characteristics make CrZnS & CrZnSe laser crystals excellent sources for efficient and powerful tunable mid-infrared lasers. Since the mid-infrared region corresponds to the atmospheric window, CrZnS & CrZnSe laser crystals hold significant potential for applications in optical communication, pollution gas detection, industrial combustion product testing, and other fields.

Lithium Thioindate (LiInS2 or LIS) is an AIBIIIC2VI ternary semiconductor crystallizing with mm2 symmetry.
LiInS2 has a large nonlinear optical (NLO) coefficient, the non-linear characteristics of the crystals are close to AgGaS2 and AgGaSe2, but their crystal structures are different. LiInS2 crustal has a high laser damage threshold, and a wide transparent wavelength range, the useful transparency range of LiInS2 is 0.5–8 μm, which makes it an excellent mid-infrared NLO crystal. LiInS2 is pyroelectric as well, its electro-optical parameters are the base for using it as an effective electro-optical material. Three‐frequency collinear phase matching is possible in LiInS2, LiInS2 has large birefringence and low absorption in the THz frequency region is judged to be a potentially more useful optical nonlinear material than the analogous compound LiGaO2.

Due to its high damage threshold and high conversion efficiency, the HgGa₂S₄ (HGS) nonlinear crystal is particularly suitable for frequency doubling in the 1-10 μm range, as well as for OPO/OPA applications. For a 4 mm long HgGa₂S₄ element, the frequency doubling efficiency for CO₂ laser radiation is approximately 10% (pulse duration of 30 ns, radiation power density of 60 MW/cm²). Although growing large HGS crystals is quite challenging, their high conversion efficiency and broad radiation wavelength tuning range make them a promising competitor to AgGaS₂, AgGaSe₂, ZnGeP₂, and GaSe crystals.

​Potassium Titanyl Arsenate (KTIOAsO4), or KTA, is a nonlinear optical crystal for Optical Parametric Oscillation (OPO) application.
It has good nonlinear optical and electro-optical properties, e.g. significantly reduced absorption in band range of 2.0-5.0 um, broad angular and temperature bandwidth, low dielectric constants.

​Potassium titanyl phosphate is widely used in commercial and military lasers, including laboratory and medical systems, range detectors, lidars, optical communications and industrial laser systems.
KTP is most commonly used for frequency-doubled Nd:YAG and other Nd-doped lasers, especially in low to medium power lasers. So far, the use of KTP for intracavity and extra cavity frequency doubling of Nd-doped lasers has gradually replaced visible-light dye lasers and tunable sapphire lasers. In many industrial studies, this type of laser is widely used as a green light source.

​Bismuth Triborate (BiB3O6 or BIBO) is a newly developed nonlinear optical crystal. It possesses large effective nonlinear coefficient, high damage threshold and inertness with respect to moisture. Its nonlinear coefficient is 3.5-4 times higher than that of LBO, 1.5-2 times higher than that of BBO. It is a promising doubling crystal to produce blue laser. The top-seeded solution growth (TSSG) technique is used at CRYSTRONG for the growth of BIBO single crystals.

Rubidium Titanyl Phosphate (RbTiOPO4 or RTP) is an isomorph of KTP crystal which is used in nonlinear and Electro-Optical applications. It has advantages of high damage threshold (about 1.8 times of KTP), high resistivity, high repetition rate, no hygroscopy and no induced piezo-electric effect with electrical signals up to 60 kHz. Its transmission range is 350 nm to 4500 nm.

Zinc Germanium Phosphide crystal is an efficient mid-infrared nonlinear optical crystal material. Its transparency range is from 0.76 to 12.0 µm, making it suitable for applications in the mid-infrared spectral region such as optical parametric amplifiers (OPA), optical parametric oscillators (OPO), second-harmonic generation (SHG), and fourth-harmonic generation (FHG).

Lithium iodate single crystal is a kind of nonlinear crystal with early industrial application. It has large nonlinear coefficient, radiation damage resistance and wide light transmission range. It can be used as a medium for generating second harmonic and parametric oscillation in laser technology. It can be used as a second, triple frequency and mixing frequency for medium and low power lasers. It can also be used to manufacture narrow pulse and wideband ultrasonic transducers with broad application prospects in the aerospace, chamical, metallurgical and petroleum industries.

Lithium Triborate (LiB3O5 or LBO) is an excellent nonlinear optical crystal. LBO crystal and its NLO devices now are produced, manufactured and marketed by CRYSTRONG.