Hygroscopic crystal products deteriorate when they're not usually kept in sufficiently dry air (or a dry purge gasoline). This applies e.g. to KDP and BBO, and in a lesser extent to LBO. It may be practical to maintain such a crystal at a fairly elevated temperature, which makes it simpler to maintain it dry.
Inertness to Humidity: BIBO crystal is inert to dampness, meaning it does not degrade or lose its optical Houses when subjected to humidity. This would make BIBO a more stable and dependable selection for optical apps in several environments.
5 mm to minimize team velocity mismatch and are perfect for frequency doubling or tripling of Ti:sapphire and Yb:doped laser pulses. The vital and noncritical period matching LBO crystals are perfect for 2nd or 3rd harmonic era of Nd:YAG and Yb:doped lasers.
Crystal life span can even be strongly dependent on the fabric excellent, Despite the fact that sure degradation phenomena look like intrinsic restrictions of the material.
Both have a comparatively small harm threshold, but tend not to need to be operated at large intensities because of their superior nonlinearity. They've an inclination for photorefractive effects, that happen to be harmful for frequency conversion, but are useful for, e.g., holographic information storage in Fe-doped LiNbO3 crystals. The tendency for “photorefractive problems�?relies upon strongly on the material composition; e.g. it can be lowered through MgO doping and by using a stoichiometric composition.
Dust and stains on crystal surfaces may cause scattering/decline of light and may even react with light-weight to break optical surfaces in a substantial incident laser energy.
Observe that even if the nominal depth is underneath the nominal injury threshold, there might be problems because of fluctuations while in the beam electrical power or neighborhood intensity (e.g., if a beam profile has “warm places�?, or as a result of isolated defects inside a crystal, that are a lot more delicate than the standard crystal material.
Bismuth Triborate (BiB3O6 or BIBO) is often a freshly formulated nonlinear optical crystal. It possesses significant efficient nonlinear coefficient, substantial hurt threshold and inertness with regard to moisture.
In the case of ultrashort pulses the substantial group velocity mismatch enforces website the usage of a shorter crystal, which needs substantial optical intensities for the presented conversion effectiveness.
Crystals which can be non-critically section-matched in the crystal oven may show issues if the crystal temperature is changed far too quickly or far too frequently. Specifically, anti-reflection coatings might be destroyed because of diverse thermal enlargement coefficients in the included materials.
In lots of instances, a nonlinear crystal used for nonlinear frequency conversion has an exceedingly very long lifetime, which happens to be for a longer period than that of The full laser program. The crystal substance is essentially not modified during Procedure. Nonetheless, a reduced crystal life span can take place under several situations:
China BIBO crystals can be used not merely as high-effectiveness frequency doubling and frequency summing equipment, but also have broad software potential customers in the sphere of optical parametric oscillation (OPO), and Additionally, it has a vital software within the productive technology of ultrabright entangled photons through blue pumped Spontaneous Parametric Down Conversions (Also Know as SPDC).
The magnitude of your powerful nonlinear coefficient depends upon the nonlinear tensor parts and around the utilized stage-matching configuration. A high nonlinearity is vital specially When the achievable optical intensities are very low.
Considering that the second harmonic (SHG) can be commonly used to crank out coherent seen light-weight and ultraviolet radiation, folks concentrate to it, but the normal nonlinear crystals like KDP, LBO, KTP, B-BBO also have quite a few shortcomings. BIBO crystal is a new variety of nonlinear crystal. In contrast with KDP crystal, it will make up with the drawback that KDP crystal can grow in big measurement but dissolve in water.