a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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A2: Indeed, extended publicity to humidity can degrade the optical functionality of BBO crystals. Humidity can cause water absorption on the crystal surface, which could have an effect on its optical Houses.
Although this rule of thumb delivers a normal pattern, It isn't a quantitative Investigation of LIDT vs wavelength. In CW purposes, For example, damage scales far more strongly with absorption in the coating and substrate, which won't always scale well with wavelength.
This improvement in clarity can lead to early prognosis and well timed intervention, possibly conserving life and strengthening affected person outcomes.
Any contamination can degrade the optical overall performance in the crystal and possibly result in destruction less than higher laser energy. When storing BBO crystals, they must be placed within a protective circumstance to prevent Bodily hurt and dirt accumulation.
In the case of Variety-I stage matching and β-BBO crystals, the basic light propagates as a unprecedented wave inside the crystal, when the 2nd harmonic light-weight propagates as a standard wave.
In some cases, the mismatch is often modest. As an example, each time a β-BBO crystal is accustomed to frequency double 1550 nm mild and provide 775 nm light-weight, the team velocity mismatch is only some femtoseconds per millimeter.
As illustrated in the next desk, the shorter the crystal, the broader the reference pulse spectrum. The table underneath assumes a elementary Centre wavelength within the close to-IR.
BBO crystals really should be managed with treatment to avoid scratching or damaging their surfaces. They should be stored inside a dry, interesting location and retained away from direct sunlight. Regular cleaning by using a delicate fabric or air blower is recommended to keep up their optical general performance. When managing BBO crystals, it’s vital that you use gloves to stop oils through the skin from contaminating the crystal surface.
The team velocity would be the pace of the heartbeat, or even more formally the envelope of the electrical field. The team index likewise governs the speed on the envelope relative towards the speed of light within a vacuum and is particularly depending on the dispersion of the material.
Equally broad-bandwidth pulses and temporal wander-off cause a reduction within the conversion performance, together with worsen the optical quality of the next harmonic pulses. The appropriate crystal thickness really should be decided on to minimize both equally results.
When check here evaluating an LIDT specified for the pulsed laser in your laser, it is crucial to learn the subsequent:
Nonetheless, the nonlinear optical Attributes of a-BBO crystal is vanished as a result of centric symmetry with its crystal framework. It is far from encouraged to implement for NLO procedures.
Technology of deep ultraviolet radiation at 210 nm by Kind-I third harmonic era is attained in a very pair of BBO crystals with conversion performance as large as 36%.