The BBO Crystal Diaries
The BBO Crystal Diaries
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We polish our parts employing a fine-grained ruby powder or slurry on a cast iron or copper plate. We apply regular stress and motion to attain a smooth area space with minimized roughness and superior flatness.
A2: Of course, prolonged publicity to humidity can degrade the optical general performance of BBO crystals. Humidity can cause h2o absorption on the crystal floor, which might impact its optical Qualities.
The harm Assessment are going to be carried out on an analogous optic (consumer's optic won't be broken). Tests could cause added prices or direct periods. Get in touch with Tech Aid for more information.
) is The real key for BBO to acquire significant conversion efficiency. Tight aim of laser beam isn't proposed.
Hygroscopic crystal supplies deteriorate when they are not normally kept in sufficiently dry air (or possibly a dry purge gas). This is applicable e.g. to KDP and BBO, As well as in a lesser extent to LBO. It might be useful to keep this kind of crystal at a somewhat elevated temperature, that makes it easier to retain it dry.
BBO crystals, with their one of a kind Qualities and wide selection of programs, are getting to be a cornerstone in the sphere of optics and photonics. These crystals, noted for their huge transparency vary, substantial hurt threshold, and outstanding non-linear optical properties, have revolutionized the best way we manipulate mild, opening up new opportunities in several scientific and technological fields.
The Rayleigh selection quantifies the distance, calculated through the beam waist, about which the beam diameter is around regular. The shorter the Rayleigh variety, the much larger get more info the rate of divergence.
Operation of nonlinear crystals at temperatures below place temperature (to realize phase matching) is usually problematic, as it might cause condensation of drinking water around the crystal surfaces if the encompassing air will not be really dry.
Beam diameter is also crucial that you know when evaluating damage thresholds. Although the LIDT, when expressed in units of J/cm², scales independently of location measurement; large beam sizes are more likely to illuminate a bigger amount of defects which can result in larger variances while in the LIDT [four].
Any scratches can degrade the optical overall performance of your crystal and perhaps cause damage under high laser power. For stubborn stains, an answer of gentle detergent or isopropyl Alcoholic beverages may be Carefully applied to the crystal floor and then rinsed off with distilled drinking water.
Significant nonlinear coefficients: BBO crystals have significant nonlinear coefficients that make productive frequency conversion procedures with small enter power demands probable.
rystal surface is horizontal and a little bit previously mentioned your fingers. Take a contemporary, clear sheet of lens tissue and spot it over the crystal. Make certain the lens tissue might be drawn over the crystal surface area. Up coming, position a small drop of pure isopropyl Liquor (IPA) about the lens tissue in addition to the crystal area.
The 266nm generation refers back to the production of ultraviolet gentle having a wavelength of 266 nanometers.
Since the refractive index isn't going to vary linearly with frequency in dispersive crystals like β-BBO, it's impossible to optimally period match each and every frequency from the enter pulse's spectral selection Along with the corresponding 2nd harmonic frequency inside the generated pulse.