5 Simple Techniques For a-BBO Crystal
5 Simple Techniques For a-BBO Crystal
Blog Article
The crystal axis is c. The Main ray is parallel towards the course used to evaluate the tuning angle (θ), which can be optimized through period matching. Conversion effectiveness is optimized for rays parallel towards the Main ray and even worse for rays at much larger angles (ψ) to the Main ray.
Sad to say, it can be very hard to check the LIDT specification of an optic to the laser. You'll find several regimes wherein a pulsed laser can damage an optic and this is based around the laser's pulse size. The highlighted columns within the desk down below outline the pertinent pulse lengths for our specified LIDT values.
The placement on the environmentally friendly curve depends on θ. In this case, the angle θ has been tuned to deliver a refractive index for 515 nm light-weight that matches the refractive index for 1030 nm light. This tuning angle is thus optimized for Type-I SHG stage matching and a basic-frequency enter beam of 1030 nm.
On the other hand, to completely make use of the opportunity of BBO crystals, it really is critical to be familiar with their Homes and the way to cope with and retailer them correctly. These crystals involve watchful handling to stop harm to their surfaces and will be saved inside of a dry, great area to take care of their optical overall performance.
The Strength density of one's beam need to be calculated concerning J/cm2. The graph to the best more info displays why expressing the LIDT as an energy density presents the very best metric for brief pulse resources. In this routine, the LIDT given being an Power density is often placed on any beam diameter; 1 will not must compute an adjusted LIDT to regulate for improvements in spot dimensions.
). This spatial concentrating constraint within the SHG course of action will typically end in the crystal length normally getting a lot less than the Rayleigh selection of the enter concentrated pulse.
Determine eighteen: The standard and amazing refractive indices of β-BBO range with frequency and wavelength as a consequence of a cloth home identified as dispersion. Dispersion exists in all media except vacuum.
As illustrated in the subsequent table, the shorter the crystal, the broader the reference pulse spectrum. The desk below assumes a elementary Heart wavelength inside the in the vicinity of-IR.
This house sets it besides linear optical elements that don’t change the frequency of light passing through them. This kind of distinguishing attribute forms the muse to get a plethora of programs that BBO can serve.
Common cleaning and appropriate storage will help lengthen the lifespan of BBO crystals, making certain their ongoing contribution to the sphere of optics and photonics.
Thorlabs offers a large choice of optics optimized to be used with femtosecond and picosecond laser pulses. You should see down below For more info.
The angular material with the resultant SHG pulse, or beam, in the dimension with the angular filter is lowered from an ideal scenario. In the perpendicular dimension, the SHG beam preserves the angular information from the enter beam, because there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. in the horizontal and vertical dimensions, causes an elliptical beam.
The physical, chemical, optical, and thermal Houses on the α -BBO are just like People with the BBO crystals, however the α -BBO won't show the nonlinear optical Homes as a result of central symmetry of its crystal composition.
In addition, the structural and compositional characteristics of BBO give it with impressive thermal steadiness and resistance versus environmental difficulties.