Nonlinear optical crystal

The nonlinear optical crystal is the crystal that shows the nonlinear optical impact more than two times for the laser electric area. Nonlinear optical crystal is a sort of practical product. The frequency-doubling (or "frequency conversion") crystal can be made use of to convert the laser wavelength. So as to extend the tunable range of the laser. Which has a crucial application worth in the field of laser innovation.

There are thousands of different sorts of nonlinear crystals. Common lithium niobate (LiNbO3--LN), lithium tantalate (LiTaO3--LT), potassium dihydrogen phosphate (KH2PO4-- KDP), potassium deuterium phosphate (KD2PO4--DKDP), lithium iodate (LiIO3--LI), potassium titanium phosphate (KTiOPO4--KTP), barium metaborate (BaB2O4--BBO), lithium trisborate (LiB3O5--LBO), potassium niobate (KNbO3--KN), cesium borate (CSB3O5--CBO), cesium lithium borate (LiCSB6O10--CLBO), potassium beryllium fluoroborate (KBe2BO3F2--KBBF), silver things (AgGaS2--AGS), silver selenium gallium (AgGaSe2--AGSe, arsenic-cadmium germanium (CDGEAS-CGA), cadmium selenide CdSe, Gallium selenide GaSe, phospho-germanium zinc (ZnGEP2-ZGP) are widely utilized in laser regularity doubling, sum frequency, distinction frequency, optical parametric amplification, electro-optic inflection, electro-optic deflection, and so on.

Nonlinear crystal residential or commercial properties

For nonlinear optical crystals, in addition to having large effective nonlinear coefficients, adhering to buildings is also required:

• 1. Generally, the crystal should have high openness for the wavelength involved;
• 2. the inner absorption must be low, and the anti-damage threshold ought to be high;
• 3. Secure physical as well as chemical homes, modest hardness, no deliquescence;
• 4. Stable crystal quality, large size, affordable rate, easy coating.

Right here are some examples of common nonlinear optical crystals

BBO nonlinear optical crystal

BBO crystal is acknowledged as one of the most excellent second-order nonlinear optical crystals worldwide. One of its impressive features is its wide frequency inflection variety. Extra importantly, by utilizing its regularity down-conversion procedure. BBO crystal can be made into a continuously tunable totally treated tuned laser with a wavelength from noticeable to near-infrared.

Barium borate (BBO) has large birefringence and also low dispersion, high damages threshold, wide stage matching array, good temperature security, huge nonlinear optical impact, and also the frequency increasing coefficient is six times that of KDP crystal. It has an extremely vast array of pervious to light, low absorption coefficient, weak piezoelectric buzzing result, various other crystal electro-optic inflection, higher termination proportion, a bigger phase in a supporting function, high optical damages threshold, the temperature level of the broadband matching, as well as superb optical homogeneity and to enhance the laser result power security, Particularly for the three-way regularity Nd: YAG laser has a variety of applications.

LBO nonlinear optical crystal

Lithium trisborate, also known as LBO, is an excellent high-power UV frequency-doubling crystal with a large transmittance band, high damage threshold as well a huge approval Angle. Lithium trisborate (LiB3O5, described as LBO) crystal is usually used in the center as well as high power 1064nm dual and three-way frequency lasers. It has really high light damage resistance threshold, very good light harmony, broad obtaining Angle, good mechanical buildings, solid thermal shock resistance, microduplication, as well as a big nonlinear coefficient.

It is among the nonlinear crystals with excellent comprehensive properties. The largest benefit of LBO is that it can make use of temperature tuning to attain non-critical stage matching (NCPM). When the frequency doubling procedure pleases the non-critical stage matching connection, the departure Angle between the essential regularity and also the second harmonic of the regularity doubling is 0. At this time, the reliable length of the LBO crystal can theoretically get to infinity, which can make up for its small nonlinear coefficient. Because of its big damage limit, this indicates that high-power essential wave pumping can be accomplished.

MgO: LiNbO3

Compared with LiNbO3 crystal, MgO: LiNbO3 crystal has its unique advantages in the application of NCPM regularity increasing. Mixing as well as an optical parametric oscillation in ND-doped lasers.

The anti-damage limit of drugged MgO: LiNbO3 crystal is more than two times higher than that of pure LiNbO3 crystal.

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