a-BBO Crystal Secrets
a-BBO Crystal Secrets
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The crystal axis is c. The Main ray is parallel into the direction utilized to evaluate the tuning angle (θ), which happens to be optimized for the duration of stage matching. Conversion performance is optimized for rays parallel to your chief ray and even worse for rays at larger sized angles (ψ) to your Main ray.
In combination with their use in laser frequency conversion, BBO crystals have discovered purposes in electro-optic modulation and quantum optics experiments.
Figure 22: The diagram at the highest reveals two pulses with distinctive center frequencies incident on a material. The group velocity delay concerning the pulses once they enter the fabric is zero.
A: A superior damage threshold ensures the crystal can cope with much more electric power without the need of degrading, bringing about lengthier lifespan and constant efficiency.
Any contamination can degrade the optical effectiveness with the crystal and probably induce destruction below higher laser electrical power. When storing BBO crystals, they must be placed in a protecting circumstance to stop Actual physical destruction and dust accumulation.
The efficiency of the SHG procedure decreases significantly as the basic beam diverges from its target, Because the pulse Electricity is dispersed across a bigger beam cross portion.
Even though the check final results are only consultant of 1 coating run, Thorlabs specifies injury threshold values that account for coating variances.
This precision allows the fabrication of intricate buildings and patterns on a variety of products, from metals to Organic tissues. It’s not almost producing smaller objects; it’s about creating them with the unprecedented amount of element.
Now Review the maximum Electrical power density to that that's specified because the LIDT for that optic. In case the optic was examined in a wavelength apart from your running wavelength, the destruction threshold needs to be scaled appropriately [three].
The period velocity is the speed at which the sphere copyright, i.e. the sine wave, travels in a material. The speed at which a pulse envelope travels in a material is known as the group velocity and defines the pace from the energy packet comprising the optical pulse touring as a result of the fabric.
The fundamental resource will be the dye laser radiation pumped by the 2nd harmonic of the Q-switched Nd: YAG laser. A stroll-off compensated configuration Along with the BBO crystal pair has enabled us to understand this kind of substantial conversion effectiveness inside the conversation.
Custom made coatings can be applied to the crystal surfaces to enhance their here overall performance at certain wavelengths or to safeguard the crystal from environmental things. However, it’s crucial to note that any customization must be accomplished carefully to avoid degrading the crystal’s optical Attributes.
When laser light is focused to a spot, the diameter of your beam waistline may be the focal spot size, and the rate at which The sunshine diverges from the beam waist is associated with the Rayleigh selection (zR).
This is especially very important in biological and professional medical research wherever specific compounds or cells are tagged with fluorescent markers. The 266nm gentle can excite these markers, creating them jump out Evidently from a track record, thereby facilitating in depth Investigation.