The calculation previously mentioned assumes a uniform beam depth profile. You have to now think about hotspots inside the beam or other non-uniform depth profiles and roughly determine a utmost electrical power density.
The team velocities of the basic and next harmonic pulses are also different, even though period-matched, as well as the magnitude of the group velocity mismatch is determined by the crystal Attributes as well as the optical frequencies within the pulses.
The ability of BBO crystals to alter the frequency of sunshine has produced them indispensable in laser technological innovation. They have got enabled the production of a wide spectrum of sunshine hues, significantly past precisely what is right available from obtainable laser resources.
Instead of the reference pulse ability spectrum comprising an apodization filter, while in the spatial area the filter could be in NA. The angular area apodization filter on the other hand, is barely in a single-dimension outlined with the plane k and .
Quite a few things can impact the performance of BBO crystals. These include temperature, humidity, and the caliber of the incident light. Correct dealing with and storage will help keep the crystal’s overall performance. Temperature can have an effect on the period-matching conditions of BBO crystals, which consequently influences their effectiveness in frequency conversion applications.
Remember to Be aware that We have now a buffer developed between the desired injury thresholds on the web and the tests which We've done, which accommodates variation amongst batches. On request, we can provide person exam facts and a testing certificate.
In some cases, the mismatch can be little. One example is, whenever a β-BBO crystal is accustomed to frequency double 1550 nm mild and supply 775 nm mild, the group velocity mismatch is just a few femtoseconds for every millimeter.
The angular written content of the concentrated beam could be visualized by tracing rays with the lens for the focal spot. Just about every ray drawn in the lens into a tightly targeted spot (Figure 23) can make another angle (ψ) with the chief ray, and also the array of angles will increase Along with the NA. As the variety of angles boosts beyond the reference NA filter (or angular domain apodization filter width), the stage-matching with the rays beyond the filter width diminishes therefore lessening the SHG conversion efficiency of Those people rays.
Now Review the utmost Vitality density to that which is specified as being the LIDT for your optic. If the optic was tested in a wavelength other than your functioning wavelength, the harm threshold have to be scaled appropriately [three].
A5: Of course, BBO crystals have fantastic thermal balance and can maintain their Homes at space temperature. This means that they are often Employed in a wide range of environments devoid of requiring Particular temperature Handle.
This calculation assumes a uniform beam depth profile. You will need to now modify this Electrical power density to account for hotspots or other nonuniform intensity profiles and around calculate a highest Electricity density. For reference a Gaussian beam usually incorporates a maximum Vitality density that is definitely 2 times that of the 1/e2 beam.
From the huge globe of nonlinear optical crystals, BBO crystals stick out as pioneers, specifically in the click here realm of 266nm technology.
The 266nm era refers to the creation of ultraviolet gentle using a wavelength of 266 nanometers.
In frequency conversion, BBO crystals are used to alter the color of laser gentle, enabling the production of a wide array of colors that aren't instantly accessible from accessible laser resources. In electro-optic modulation, they are utilised to manage the intensity, stage, polarization, or way of a laser beam.