a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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The crystal axis is c. The chief ray is parallel into the route utilized to evaluate the tuning angle (θ), and that is optimized for the duration of phase matching. Conversion performance is optimized for rays parallel on the Main ray and worse for rays at more substantial angles (ψ) to your Main ray.
β-BBO Crystal—a commonly used nonlinear crystal for frequency conversion from the ultraviolet, visible and in close proximity to-infrared
A further Similarly intriguing application is optical parametric oscillation. In this particular, BBO allows for the conversion of a photon into two photons with various frequencies, the sum of which equals the original photon’s frequency.
Having said that, it’s imperative that you Observe that although BBO crystals can handle high ability, they ought to however be employed in just their specified electrical power array to stop likely destruction and assure ideal performance.
From the ray-product point of view, the propagation course defines the orientation with the central (chief) ray in Figure 23. The SHG process is influenced from the number of angles in excess of which incident light propagates, because gentle that isn't parallel into the Main ray has diminished stage-matching relative on the chief ray.
The performance of the SHG method decreases substantially as the basic beam diverges from its emphasis, Because the pulse Vitality is dispersed across a bigger beam cross section.
Determine eighteen: The regular and remarkable refractive indices of β-BBO range with frequency and wavelength due to a material residence identified as dispersion. Dispersion exists in all media except vacuum.
The Actual physical, chemical, optical, and thermal properties of the α -BBO are much like People of your BBO crystals, however the α -BBO will not exhibit the nonlinear optical Homes as a result of central symmetry of its crystal framework.
Assuming a crystal of a specified thickness, it is feasible to determine a reference pulse by using a spectral variety that is the utmost that can be sufficiently stage matched. This spectral bandwidth limitation can also be thought of in terms of an SHG spectral filter whose passband will depend on both of those the specific crystal and the pulse's Heart frequency. Frequencies outside of this filter’s passband will be turned down from going through the SHG procedure.
Thus, the second harmonic pulse spectrum, revealed on the appropriate, includes a spectral width somewhere around similar to the ideal circumstance. Ideally, each individual frequency in the basic pulse spectrum could be at the same time phase matched.
Every single aspect of BBO, from its atomic composition read more to its broad software spectrum, underscores its pivotal function in modern-day science and engineering.
Next, the ability/Power is both enhanced or diminished as well as the optic is uncovered at 10 new spots. This process is recurring until problems is observed. The injury threshold is then assigned being the highest electrical power/Electricity that the optic can stand up to with no causing hurt. A histogram which include that beneath signifies the tests of one BB1-E02 mirror.
Nevertheless, the nonlinear optical Qualities of a-BBO crystal is vanished a result of the centric symmetry with its crystal framework. It's not necessarily recommended to make use of for NLO procedures.
Furthermore, the structural and compositional characteristics of BBO give it with impressive thermal security and resistance in opposition to environmental problems.