About BBO Crystal
About BBO Crystal
Blog Article
In some cases, the mismatch could be compact. One example is, any time a β-BBO crystal is utilized to frequency double 1550 nm gentle and supply 775 nm light-weight, the group velocity mismatch is only some femtoseconds for each millimeter.
Optical parametric chirped-pulse amplification (OPCPA): We use OPCPA to determine our items�?nonlinear conversion efficiency and also period-matching angle to get a supplied enter wavelength and signal/idler wavelengths.
We diminished our boule into more compact objects according to consumer requirements using a ruby blade, or wire saw machine. After that, polish these items utilizing ruby powder or slurry on cast iron or copper plates.
Take note that regardless of whether the nominal depth is under the nominal hurt threshold, there might be difficulties on account of fluctuations while in the beam energy or regional depth (e.g., if a beam profile has “incredibly hot places�?, or because of isolated defects within a crystal, that happen to be additional sensitive in comparison to the normal crystal materials.
BBO is of particular value from the noticeable and much UV. Numerous types of section-matching purposes are achievable, such as the next:
Normal cleansing and appropriate storage might help lengthen the lifespan of BBO crystals. It’s also vital that you prevent exposing the crystals to situations outside their specified working variety, as this could potentially cause long-lasting injury.
A suggested guideline for focusing femtosecond laser pulses right into a nonlinear crystal is to keep up a Rayleigh vary that's at least several times lengthier compared to the size on the SHG crystal. This minimizes the chance of harming the crystal, and also decreases the damaging effects of spatial period mismatch and spatial (Poynting vector) stroll-off.
Beta Barium Borate (BBO) crystals have taken the entire world of photonics by storm. One of the most spectacular areas of these crystals is their groundbreaking function in 266nm technology.
The team velocities of the elemental and 2nd harmonic pulses are different, even though section-matched, plus the magnitude in the team velocity mismatch will depend on the crystal Houses plus the optical frequencies in the pulses.
Although this general guideline gives a typical trend, It's not necessarily a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, destruction scales far more strongly with absorption within the coating and substrate, which doesn't necessarily scale nicely with wavelength.
Excessive optical intensities all through operation may perhaps immediately damage a crystal. Regrettably, read more nonlinear crystals frequently have to be operated not significantly from their optical damage threshold to realize a adequately higher conversion effectiveness. This suggests a trade-off concerning conversion effectiveness and crystal life span.
The pole is progressively brought up even though revolving at a consistent velocity. This triggers a skinny thaw layer to bolster the seed crystal, creating a round boule.
Hence, the 2nd harmonic pulse spectrum, revealed on the right, contains a spectral width roughly the same as the ideal circumstance. Ideally, each frequency in the basic pulse spectrum could well be concurrently section matched.
Yet another equally intriguing software is optical parametric oscillation. Within this, BBO allows for the conversion of the photon into two photons with distinct frequencies, the sum of which equals the original photon’s frequency.