The Definitive Guide to BBO Crystal
The Definitive Guide to BBO Crystal
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Crystals that happen to be non-critically stage-matched in a crystal oven may perhaps exhibit difficulties once the crystal temperature is modified far too speedily or too generally. Specifically, anti-reflection coatings could possibly be harmed on account of distinctive thermal growth coefficients from the involved components.
This wonderful-tuning functionality implies that BBO crystals can cater to both of those generic and very specialised requirements with equivalent finesse.
From the ray-design point of view, the propagation way defines the orientation with the central (Main) ray in Determine 23. The SHG approach is impacted because of the number of angles about which incident light propagates, due to the fact light-weight that is not parallel into the chief ray has reduced phase-matching relative for the chief ray.
Thorlabs expresses LIDT for CW lasers as a linear electrical power density measured in W/cm. In this particular routine, the LIDT specified to be a linear electrical power density could be applied to any beam diameter; just one isn't going to should compute an adjusted LIDT to regulate for improvements in location sizing, as shown via the graph to the best. Regular linear ability density is usually calculated utilizing the equation beneath.
The seed crystal is slightly BBO crystal with a distinct positioning together considered one of its principal axes. The seed crystal is affixed to some turning rod that dips to the thaw floor place.
Indeed, BBO crystals is usually custom-made In line with certain prerequisites. This involves custom dimensions, styles, and coatings. Nonetheless, customization might have an effect on the crystal’s Attributes and efficiency, so it ought to be accomplished by knowledgeable. Personalized dimensions and designs could be Slash from a bigger BBO crystal to suit particular purposes.
Determine eighteen: The common and amazing refractive indices of β-BBO differ with frequency and wavelength due to a material assets named dispersion. Dispersion exists in all media other than vacuum.
When one particular of those β-BBO Crystals is mounted while in the RSP1 mount, the crystal might be centered over the eight-32 (M4) gap in the mount's foundation with no will need for spacers.
The team velocities of the elemental and next harmonic pulses are diverse, even if stage-matched, along with the magnitude on the team velocity mismatch will depend on the crystal Houses along with the optical frequencies during the pulses.
The Strength density of the beam must be calculated regarding J/cm2. The graph to the appropriate displays why expressing the LIDT being an energy density provides the ideal metric for brief pulse sources. Within this regime, the LIDT given being an Electrical power density is often placed on any beam diameter; one would not should compute an altered LIDT to regulate for improvements in spot sizing.
Pumped with the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength range amongst 422nm and 477nm has long been noticed by angle-tuning a type I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields greater than 50µJ (utmost one hundred thirtyµJ),
BBO nonlinear crystal can be a detrimental uniaxial crystal. It offers section matching for several next-get interactions Pretty much more than its whole transparency assortment. This transparency ranges from 185 nm to 3.three µm, as inferred from transmittance measurements working with crystal samples of a few mm thickness.
The temporal stroll-off is commonly thought of serious once the temporal lag exceeds the length of the basic pulse. Significant stroll-off can result in temporal lag that irreparably increases the length on the output next harmonic pulse.
flux-grown KTP and RTP with its more info significant nonlinearity, also in variants with large grey tracking resistance