What Does BBO Crystal Mean?
What Does BBO Crystal Mean?
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This post dives deep into the advantages and distinctive Homes of BBO crystal and its paramount value in effective frequency doubling and harmonics technology at 266nm.
This great-tuning ability implies that BBO crystals can cater to each generic and highly specialized requirements with equal finesse.
However, it could be quite challenging to compare the LIDT specification of the optic for your laser. You will find a number of regimes during which a pulsed laser can hurt an optic which is based within the laser's pulse duration. The highlighted columns while in the table beneath define the appropriate pulse lengths for our specified LIDT values.
Thorlabs expresses LIDT for CW lasers to be a linear ability density measured in W/cm. In this routine, the LIDT offered for a linear energy density is often applied to any beam diameter; a single won't really need to compute an adjusted LIDT to regulate for adjustments in location dimension, as demonstrated from the graph to the right. Ordinary linear ability density can be calculated utilizing the equation below.
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Having said that, to completely benefit from the prospective of BBO crystals, it is essential to be familiar with their Qualities and how to tackle and retailer them adequately. These crystals need cautious dealing with to circumvent harm to their surfaces and may be saved in a very dry, cool area to take care of their optical overall performance.
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The group velocity as well as the phase velocity aren't equal, this means the sine wave with the provider and the envelope of the heartbeat move by means of optical media at distinct speeds.
The team velocities click here of the basic and second harmonic pulses will also be various, even though section-matched, and the magnitude in the group velocity mismatch is dependent upon the crystal Attributes and also the optical frequencies inside the pulses.
Rather than decompose the SHG polarization into parts Ex and Ez, The sunshine is often referred to as a rare wave (E'e) by using a refractive index, n'e. Within the diagram on the proper, n'e, which relies on θ, is indicated because of the intersection in the conic section illustrated through the pink ellipse Together with the XZ airplane.
BBO crystals are renowned for their Extraordinary optical Houses. Their large transparency variety makes it possible for them to operate effectively across a broad spectrum, from ultraviolet to around-infrared gentle. This will make them exceptionally multipurpose and suitable for several different apps.
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The angular articles of the centered beam can be visualized by tracing rays with the lens towards the focal place. Each ray drawn within the lens to some tightly focused place (Figure 23) helps make a unique angle (ψ) Using the chief ray, along with the choice of angles improves Together with the NA. As the array of angles boosts beyond the reference NA filter (or angular domain apodization filter width), the period-matching with the rays beyond the filter width diminishes therefore lowering the SHG conversion effectiveness of All those rays.
Even if the crystal material or coating will not be delicate to h2o, little water droplets may possibly concentration laser radiation more tightly than below regular operation, and so destruction the crystal product.