a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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High-precision laser microfabrication is a method where by products are processed and modified on the microscopic scale. This method needs a laser resource that will deliver particularly concentrated and specific beams of light. The 266nm wavelength is particularly suited to this due to its brief wavelength, which ensures that the laser beam could be focused to an incredibly small spot dimensions.
The group velocities of the fundamental and 2nd harmonic pulses may also be distinct, even if section-matched, along with the magnitude in the team velocity mismatch is determined by the crystal Homes along with the optical frequencies during the pulses.
The position with the inexperienced curve depends on θ. In such a case, the angle θ continues to be tuned to deliver a refractive index for 515 nm gentle that matches the refractive index for 1030 nm light. This tuning angle is thus optimized for Type-I SHG phase matching plus a fundamental-frequency input beam of 1030 nm.
When one of those β-BBO Crystals is mounted within the RSP1 mount, the crystal will be centered about the 8-32 (M4) hole from the mount's foundation without the need for spacers.
We use Numerical Aperture (NA) to explain the extent of this angular written content. Ideally, the basic laser light could well be collimated all over the crystal, given that collimated light-weight resembles a bunch of rays aligned to exactly the same way with the NA of zero.
The four lessen figures illustrate that the group velocity delay (temporal wander-off) increases as being the pulses propagate via the material. The temporal wander-off is illustrated for distances Z0 by way of Z3, which can be indicated over the diagram at leading.
The realm of fabric processing has equally benefited with the precision of 266nm era. Advanced microfabrication treatments, which require intricate detailing on supplies in a microscopic degree, involve an exact gentle resource. The sharpness connected with the 266nm wavelength makes certain that lasers could make exact cuts, etches, and modifications.
As illustrated in the next table, the shorter the crystal, the wider the reference pulse spectrum. The desk underneath assumes a fundamental Heart wavelength within the in close proximity to-IR.
Pumped by the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with sign wavelength vary in between 422nm and 477nm is noticed by angle-tuning a sort I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields greater than 50µJ (utmost 130µJ),
The team velocity is definitely the speed of the pulse, or even more formally the envelope of the electrical industry. The team index similarly governs the speed with the envelope relative to the velocity of light in a vacuum and is dependent on the dispersion of the material.
BBO nonlinear crystal is really a unfavorable uniaxial crystal. It provides section matching for a variety of next-buy interactions Just about around its full transparency vary. This transparency ranges from 185 nm to 3.three µm, as inferred from transmittance measurements utilizing crystal samples of a few mm thickness.
Yes, BBO crystals might be custom made Based on unique requirements. This consists of tailor made sizes, styles, and coatings. Having said that, customization could have an affect on the crystal’s Qualities and functionality, so it ought to be carried out by a specialist. Tailor made dimensions and designs may be Lower from a bigger BBO crystal to fit distinct purposes.
A advisable guideline for focusing femtosecond laser pulses right into a nonlinear crystal is to keep up a Rayleigh variety that is definitely not less than many instances longer than the size from the SHG crystal. This minimizes the prospect of harmful the crystal, as well as lowers the unfavorable consequences of spatial stage mismatch and spatial (Poynting vector) wander-off.
And lastly, spectroscopy, the examine of interactions between make any difference and electromagnetic radiation, drastically Advantages within the 266nm era. In spectroscopic purposes, diverse wavelengths of sunshine interact in another way with resources, furnishing a spectrum that could be analyzed to determine website the fabric’s Qualities or composition.