Now compare the maximum energy density to that which is specified as the LIDT for the optic. The spreadsheet will then calculate a linear power density for CW and pulsed systems, as well as an energy density value for pulsed systems. 0000007406 00000 n For any requests on custom items in the future, we can help you at Thank you for participating in our Feedback Forum. 0000001652 00000 n Optical constants of Fused silica matching liquid Cargille-50350. I'm looking for 1 mm thick 12.7 mm diameter UV FS windows with broadband AR coating (650 - 1050). Am. Wavelength, µm n, k. Chart context menu. What is the reflection at 45º for the AR B-coating 650-1060 nm? The energy density of your beam should be calculated in terms of J/cm2. This graph was obtained from [1]. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). We intent to use it in a high temperature application (200°C) and would like to know if it can suit our need. can you please provide optical refractive index data of the fused silica material that is used for these UV Fused Silica High-Precision windows.

I need a small rod of UV fused silica, 5 mm diameter or square, 10 mm in length, polished both ends. <<1C21D9390601C949A7813C9921FCDB10>]/Prev 1331297/XRefStm 1422>> 3009 0 obj <> endobj Beam diameter is also important to know when comparing damage thresholds. The above Sellmeier dispersion equation for SiO2 was used to fit the refractive indices of 35 wavelengths from 2326 nm to 185 nm. Extinction coefficient [ i ] k =. Response from Tim at Thorlabs to Sébastien: Your temperature should be fine as we often coat these 200-250C. A histogram such as that below represents the testing of one BB1-E02 mirror. For additional information on these coatings, please see the Graphs tab. Regards, The pulse length must now be compensated for. the attenuation for that range should be minimal. Solids 223, 158-163 (1998) * Sellmeier formula is reported in Ref. We recommend mounting the thin, round windows in our LMR1 or LMR1/M Fixed Lens Mount and securing them with a SM1LTRR Stress-Free Retaining Ring.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. A naive calculation of the average linear power density of this beam would yield a value of 0.5 W/cm, given by the total power divided by the beam diameter: However, the maximum power density of a Gaussian beam is about twice the maximum power density of a uniform beam, as shown in the graph to the right. We need glass will be used in flame detector, before R2868 flame sensor. Extinction coefficient [ i ] k =. Thank you. In order to illustrate the process of determining whether a given laser system will damage an optic, a number of example calculations of laser induced damage threshold are given below. If you do not provide the rods, any leads to find the provider will be appreciated. Both of these LIDT values, while measured at 355 nm, were determined with a 10 ns pulsed laser at 10 Hz. Contact Tech Support for more information. To learn more about how fused silica fits into your application, contact Swift Glass today. I will have a quote sent to you. FRANCE.

To request a quote, one can contact as well. Can you make such windows? On the other hand, the pulsed LIDT scales with the square root of the laser wavelength and the square root of the pulse duration, resulting in an adjusted value of 55 J/cm2 for a 1 µs pulse at 980 nm. 0 Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. Fused Silica – Refractive Index. The index of refraction of optical quality fused silica (SiO2) was determined for 60 wavelengths from 0.21 to 3.71 μ at 20°C. 0000002197 00000 n This system falls somewhere between the regimes of CW and pulsed laser induced damage, and could potentially damage an optic by mechanisms associated with either regime. For assistance with performing similar calculations, we provide a spreadsheet calculator that can be downloaded by clicking the button to the right. LIDT in linear power density vs. pulse length and spot size. Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. The LIDT scaling laws are determined from empirical relationships; their accuracy is not guaranteed.

In this case, the absorptive filter is the best choice in order to avoid optical damage. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. In fused silica, the density (refractive index) increases when glass is rapidly cooled from a higher temperature (Bruckner, 1970). Dear Madam/Sir, For long pulses to CW, linear power density becomes a constant with spot size. As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers.

As before, the CW LIDT of the optic scales linearly with the laser wavelength, resulting in an adjusted CW value of 6 W/cm at 980 nm. trailer Determination of refractive index of silica glass for infrared wavelengths by IR spectroscopy, J. Non-Cryst. Created with Highcharts 5.0.14.

UV-grade fused silica is well-suited for applications that benefit from increased transmission deeper into the UV than N-BK7. Conditions: 22 ˚C, 760 mm Hg, N 2 Wavelength [Vacuum] [nm] Refractive Index1 n Thermal Coefficient2 ∆n/∆T [ppm/C] Sellmeier Dispersion Equation Constants1, 20 ˚C 2326.050 1.433027 8.7 A 1 7.033574317E-02 The temperature dependence of the refractive indices of high-purity fused silica and crystal quartz was measured in the 450-1600 nm wavelength range and at temperatures from room temperature to 400 degrees C. The average thermal coefficients of the refractive indices of those materials show opposite sign. do you also provide measured transmission spectra for the coated windows (especially coating A and B)? We also offer laser windows and wedged laser windows, which have wavelength-specific AR coatings centered around commonly used laser wavelengths, and Brewster windows, which eliminate p-polarization reflectance. For pulse widths between 1 - 100 ns, an approximation is as follows: Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. Hello, Therefore, a more accurate determination of the maximum linear power density of the system is 1 W/cm. %PDF-1.4 %���� The damage threshold of an NDUV10A Ø25 mm, OD 1.0, reflective neutral density filter is 0.05 J/cm2 for 10 ns pulses at 355 nm, while the damage threshold of the similar NE10A absorptive filter is 10 J/cm2 for 10 ns pulses at 532 nm. An AC127-030-C achromatic doublet lens has a specified CW LIDT of 350 W/cm, as tested at 1550 nm. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions. While the LIDT, when expressed in units of J/cm², scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. All of the round UVFS windows can be ordered from stock uncoated or with one of the following broadband AR coatings: 245 - 400 nm (designated as -UV), 350 - 700 nm (designated as -A), 650 - 1050 nm (designated as -B), or 1050 - 1700 nm (designated as -C).Thorlabs' high-performance multilayer AR coatings have an average reflectance of less than 0.5% (per surface) across the specified wavelength ranges (denoted by the shaded blue area in the Coating graphs below).


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