Top BBO Crystal Secrets
Top BBO Crystal Secrets
Blog Article
Tailor made coatings can be applied to the crystal surfaces to enhance their functionality at specific wavelengths or to safeguard the crystal from environmental variables. Nonetheless, it’s vital that you Notice that any customization really should be carried out thoroughly to prevent degrading the crystal’s optical Attributes.
The 2 frequencies' section velocities are equal whenever they hold the very same refractive index. The refractive indices for both of these frequencies are normally not equivalent, due to the fact all media apart from vacuum are dispersive. Consequently a cloth's refractive index depends upon The sunshine's frequency.
We lessened our boule into scaled-down merchandise In accordance with shopper technical specs using a ruby blade, or wire observed machine. After that, polish these parts applying ruby powder or slurry on cast iron or copper plates.
The section-matching abilities of BBO crystals are entitled to Unique mention. Within the intricate dance of photons, in which conversion from one wavelength to another is frequently desired, the phase-matching provided by BBO ensures that Electrical power losses are small.
BBO is of specific significance in the noticeable and much UV. Lots of period-matching purposes are doable, including the adhering to:
Many various section-matching techniques may be used to equalize the refractive indices of the fundamental and 2nd harmonic gentle. One approach, which uses linearly polarized mild and also the difference between the standard and incredible refractive indices, is Style-I crucial period matching. This is a popular method for adverse uniaxial crystals wherein no > ne.
Figure 18: The regular and remarkable refractive indices of β-BBO vary with frequency and wavelength due to a material property named dispersion. Dispersion exists in all media apart from vacuum.
the chemical longevity; e.g., some crystal products are hygroscopic, Many others undergo chemical changes when heated inside of a vacuum chamber for software of the dielectric coating
Physically, when the fundamental get more info spectrum is perfectly throughout the reference pulse spectrum, the SHG pulse intensity profile is the sq. of the basic intensity profile, successfully truncating the period. This circumstance is illustrated in Figure 20.
The phase matching angle is usually modified by rotating the crystal within the y axis. An adjustment that is typically in a several levels can possibly optimize the effectiveness in the crystal in the set up or match One more basic frequency while in the crystal's working range.
Pumped from the fourth harmonic of the Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength selection among 422nm and 477nm continues to be observed by angle-tuning a kind I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields more than 50µJ (utmost a hundred thirtyµJ),
As illustrated in the subsequent desk, the shorter the crystal, the wider the reference pulse spectrum. The desk underneath assumes a basic Middle wavelength in the close to-IR.
BBO crystals also have a high destruction threshold, that means they can face up to higher amounts of laser electricity without the need of suffering hurt. This is especially important in applications involving higher-energy lasers. On top of that, BBO crystals Have a very large nonlinear coefficient, which permits effective frequency conversion, a important function in several optical techniques.
Our crystals are used in a wide range of purposes, including many varieties of nonlinear frequency conversion and electro-optics, but in addition quantum technologies.