a-BBO Crystal Options
a-BBO Crystal Options
Blog Article
The calculation above assumes a uniform beam intensity profile. You will need to now look at hotspots inside the beam or other non-uniform intensity profiles and roughly estimate a utmost power density.
Besides their use in laser frequency conversion, BBO crystals have found programs in electro-optic modulation and quantum optics experiments.
A further equally intriguing software is optical parametric oscillation. Within this, BBO permits the conversion of a photon into two photons with diverse frequencies, the sum of which equals the first photon’s frequency.
A: A superior destruction threshold guarantees the crystal can tackle a lot more electric power without degrading, resulting in extended lifespan and reliable performance.
BBO crystals can be cleaned employing a tender fabric or air blower. For stubborn stains, a mild detergent or isopropyl Liquor can be used. It’s essential to keep away from employing abrasive supplies that could scratch the crystal’s surface area. When cleaning BBO crystals, it’s essential to use a gentle, round movement to avoid scratching the floor.
Thorlabs expresses LIDT for CW lasers like a linear power density calculated in W/cm. During this routine, the LIDT provided to be a linear electric power density might be applied to any beam diameter; a single isn't going to ought to compute an adjusted LIDT to adjust for variations in place dimension, as shown through the graph to the correct. Regular linear electricity density might be calculated using the equation below.
The spatial walk-off angle is determined by the size on the beam plus the crystal length. While the angle could be important, it is usually tiny, generally to the get of ten mrad, and will be neglected.
On the other hand, although BBO crystals can work at area temperature, Intense temperatures really should nonetheless be averted as they're able to impact the crystal’s stage-matching ailments and potentially bring about damage.
As an example, consider a elementary pulse propagating more than a supplied crystal thickness. When the temporal stroll-off is bigger compared to length of the elemental pulse, this pulse will also have a spectral bandwidth that tremendously website exceeds the spectral width of the reference pulse. A standard rule for restricting the harmful consequences associated with equally Bodily outcomes is to pick a crystal thickness that boundaries the elemental and next harmonic temporal wander-off to not more than the duration of the fundamental pulse.
The group velocity is the speed of the heartbeat, or maybe more formally the envelope of the electric discipline. The group index equally governs the velocity from the envelope relative on the velocity of sunshine inside of a vacuum and is dependent on the dispersion of the fabric.
Both of those wide-bandwidth pulses and temporal walk-off lead to a discount inside the conversion performance, as well as worsen the optical good quality of the next harmonic pulses. The suitable crystal thickness really should be chosen to minimize each results.
Beta Barium Borate (BBO) crystals have taken the earth of photonics by storm. The most amazing areas of these crystals is their revolutionary purpose in 266nm era.
When laser gentle is targeted to a location, the diameter with the beam waistline will be the focal location measurement, and the rate at which The sunshine diverges through the beam waist is related to the Rayleigh array (zR).
BBO’s flexibility certainly shines when one considers the breadth of its applications. It’s not just confined to one market of photonics but stretches across a number of domains. Just take frequency doubling, For illustration. In this method, photons While using the same frequency combine inside the crystal to supply new photons with double the frequency of the initial.