These crystals are exceptional thanks to their capability to alter the frequency of light passing by way of them, a house that is highly wanted in different fields like laser technology and quantum physics. The versatility of BBO crystals will make them an important part in several Highly developed optical devices.
As well as their use in laser frequency conversion, BBO crystals have discovered purposes in electro-optic modulation and quantum optics experiments.
The flexibility of BBO crystals to alter the frequency of light has created them indispensable in laser engineering. They may have enabled the creation of a wide spectrum of light colours, considerably past what on earth is specifically obtainable from out there laser resources.
Beam diameter is usually crucial that you know when comparing harm thresholds. While the LIDT, when expressed in models of J/cm², scales independently of spot measurement; substantial beam sizes are more likely to illuminate a bigger amount of defects which can cause greater variances from the LIDT [four].
Finally, the extensive-angle tunability of BBOs facilitates customization like never prior to. Depending upon the unique requirements of an application, the crystal could be modified with precision, making certain that the output is often optimized.
). This spatial focusing constraint on the SHG method will commonly bring about the crystal duration normally staying a lot less than the Rayleigh number of the enter targeted pulse.
Their higher hurt threshold and great thermal stability make them suitable for use in high-electrical power laser devices, whilst their huge transparency range lets them to work that has a broad number of laser wavelengths.
As illustrated in the following desk, the shorter the crystal, the wider the reference pulse spectrum. The table underneath assumes a essential Heart wavelength from the near-IR.
For the reason that refractive index isn't going to fluctuate linearly with frequency in dispersive crystals like β-BBO, it really is not possible to optimally period match each and every frequency in the enter pulse's spectral range Along with the corresponding next harmonic frequency inside the created pulse.
The temporal walk-off with the slower pulse with respect towards the a lot quicker is usually a substantial portion of the heartbeat duration. This is a-BBO Crystal often illustrated in Figure 22.
The team velocity plus the period velocity are certainly not equal, this means the sine wave of your provider as well as envelope of the pulse move by way of optical media at various speeds.
The angular written content of the resultant SHG pulse, or beam, from the dimension with the angular filter is diminished from a super situation. While in the perpendicular dimension, the SHG beam preserves the angular content with the enter beam, considering the fact that there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. from the horizontal and vertical Proportions, leads to an elliptical beam.
The next harmonic light-weight is then polarized parallel towards the airplane. Angle tuning adjusts θ which is performed by rotating the crystal within the Y-axis.
Generation of deep ultraviolet radiation at 210 nm by Variety-I 3rd harmonic era is attained in a set of BBO crystals with conversion efficiency as superior as 36%.