The best Side of a-BBO Crystal
The best Side of a-BBO Crystal
Blog Article
Large-precision laser microfabrication is a technique where components are processed and modified on a microscopic scale. This process demands a laser source that may develop really centered and exact beams of light. The 266nm wavelength is especially well suited for this as a result of its brief wavelength, which ensures that the laser beam might be targeted to a very little place size.
The length on the SHG crystal appreciably influences the spectral width on the reference pulse, or alternatively the bandwidth on the SHG filter.
While this general guideline supplies a normal trend, It's not a quantitative Examination of LIDT vs wavelength. In CW applications, As an illustration, injury scales extra strongly with absorption within the coating and substrate, which would not necessarily scale perfectly with wavelength.
This effectiveness is important, particularly when a person considers the technology on the 266nm wavelength, where by even minimal inefficiencies can result in significant Electricity losses.
Determine 23: This diagram illustrates a beam's focal area in a very uniaxial birefringent content. Straight traces, symbolizing rays, are drawn with the center from the beam waist. Given that the beam diverges through the beam midsection, the Vitality from the beam is dispersed above a larger cross sectional spot.
Unfavorable uniaxial α-BBO crystal is a wonderful birefringent crystal, appropriate for the manufacture of polarizer, polarization beam displacer, time hold off compensator plate and also other birefringent gadget, specifically for UV and significant electrical power laser.
The second harmonic frequency wave is generated as an extraordinary wave, that is polarized orthogonal to the elemental-frequency everyday wave.
These Qualities make BBO crystals extremely desirable in many purposes, from laser frequency conversion to electro-optic modulation. Their wide transparency variety permits them to operate with a wide range of laser wavelengths, even though their large injury threshold guarantees they might cope with superior-electricity laser beams with out degradation.
Knowledge Crystal is akin to appreciating the bedrock of Sophisticated optical technological know-how. At its essence, BBO, or Beta Barium Borate, stands like a nonlinear optical crystal. The expression “nonlinear�?here signifies the exclusive means from the crystal to communicate with light-weight within a way that alters The sunshine’s frequency.
The group velocity will be the velocity of the heart beat, or maybe more formally the envelope of the electric field. The group index similarly governs the speed of the envelope more info relative to your velocity of light inside a vacuum and is depending on the dispersion of the fabric.
Equally wide-bandwidth pulses and temporal walk-off bring about a discount inside the conversion performance, in addition to worsen the optical top quality of the next harmonic pulses. The right crystal thickness should be selected to reduce both equally outcomes.
Custom made coatings might be placed on the crystal surfaces to reinforce their effectiveness at unique wavelengths or to shield the crystal from environmental things. Having said that, it’s important to note that any customization need to be accomplished thoroughly to stop degrading the crystal’s optical Houses.
The 266nm technology refers to the production of ultraviolet gentle using a wavelength of 266 nanometers.
In frequency conversion, BBO crystals are accustomed to change the shade of laser light, enabling the manufacture of a variety of colours that aren't immediately obtainable from accessible laser resources. In electro-optic modulation, They're applied to manage the intensity, period, polarization, or direction of a laser beam.