The pulsed damage threshold for the -E03 coating is 0.5 J/cm^2 (1064 nm, 10 ns, 10 Hz, Ø0.433 mm). Hello, We coat these at temperatures ranging from 200 ºC - 250 ºC. If so, is it s- or p- polarized? You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density. Hello, thank you for contacting Thorlabs. Thank you for shopping at Thorlabs. A dielectric mirror, also known as a Bragg mirror, is a type of mirror composed of multiple thin layers of dielectric material, typically deposited on a substrate of glass or some other optical material. Hello, I was wondering if the BB1-E04 came in a 1"x1" size similar to BBSQ1-E02 and BBSQ1-E03. I understand that there will be variations depending on coating runs and I do not need measured data. I have reached out to you directly with dispersion data for the E02 coating. Can you let me know what the CW damage threshold is for E02 coated optics? A response from Adam at Thorlabs to iddoheller: We currently test the mirrors up to 50 degrees C so we cannot guarantee performance at 100 degrees. Please add on large plot at the bottom of the plots tab that shows all the mirrors on one plot. I have reached out to you directly to discuss the possibility of offering this. I'm interested in the reflectance of the E01 coating at an angle of 60 and 75 degrees. Do you have data at these values? The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values. I seem to lose more light when the beam is highly focussed on striking the mirror. AT 780 nm, we can estimate that the damage threshold will be lower by about 25%. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. Upon request, we can provide individual test information and a testing certificate. The energy density of your beam should be calculated in terms of J/cm2. Amongst our wide-ranging portfolio, we provide parabolic and rod & cone mirrors, parabolic & ellipsoidal reflectors, concave and elliptical mirrors as well as back-surface and front-surface mirrors. Thank you in advance. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. We are able to provide dispersion curves for these coatings. We'd like R>99% for 280-300nm with T<30% at 266nm. I will contact you with the data we do have. [3] C. W. Carr et al., Phys. Both the wavefront and the polarization is often scrambled on the transmitted beam. Due to variations in each run, this recommended spectral range is narrower than the actual range over which the optic will be highly reflective. The stated damage threshold is a certification measurement, as opposed to a true damage threshold (i.e., the optic was able to withstand the maximum output of the laser with no damage). If this relatively long-pulse laser emits a Gaussian 12.7 mm diameter beam (1/e2) at 980 nm, then the resulting output has a linear power density of 5.9 W/cm and an energy density of 1.2 x 10-4 J/cm2 per pulse. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Sorry for the double posting, but this was not 100% clear from the previous reply. We do not have your contact information, but please send an email to Techsupport@thorlabs.com to request the data. While the broadband mirror would likely be damaged by the laser, the more specialized laser line mirror is appropriate for use with this system. Common techniques are physical vapor deposition (which includes evaporative deposition and ion beam assisted deposition), chemical vapor deposition, ion beam deposition, molecular beam epitaxy, and sputter deposition. If you have further questions or concerns, please let me know. S & P polarization. Response from Laurie @ Thorlabs to ulbricht: Thank you for your inquiry. Hi I have reached out to you directly with information on the top layer material. • When a wave is reflected in going from a medium with a higher refractive index to a lower refractive index, the phase is not shifted. I'm just trying to make a decision if it's worthwhile for me to test these mirrors in my application or not. We are planning to use these mirrors in an interferometer. Please note since this is outside the designated coating range, there is a chance that the theoretical information may not match every coating run exactly. We can provide these to you. The energy density of the beam can be compared to the LIDT values of 1 J/cm2 and 3.5 J/cm2 for a BB1-E01 broadband dielectric mirror and an NB1-K08 Nd:YAG laser line mirror, respectively. It would be helpful if you add the 45 and 0 degree reflectivity curve together in the plot. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. 2 .BB2-E03 - Ø2" Broadband Dielectric Mirror, 750-1100 nm Response from Bweh at Thorlabs USA: I will share this with you by email. Also note if the mirrors are bulk packaged or does each optic come with its own box. I applied your values to these equations and calculated an LIDT value of ~17 J/cm^2 for our E03 lenses under the parameters you describe. 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. 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]. The LIDT for an optic greatly depends on the type of laser you are using. The reflection phase is the phase shift of reflected light, i.e., the optical phase change obtained when comparing light directly before and directly after the reflection. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). My apologies for the inconvenience caused by this. I guess i will input the code key into the input box labeled 'Reload', should i know what Reload means in this context, have to admit that i do not.”, Fused Silica Broadband Dielectric Mirrors, Ø7.0 mm Broadband Dielectric Mirror, 400 - 750 nm, Ø7.0 mm Broadband Dielectric Mirror, 750 - 1100 nm, Ø7.0 mm Broadband Dielectric Mirror, 1280 - 1600 nm, Ø1/2" Broadband Dielectric Mirror, 350 - 400 nm, Ø1/2" Broadband Dielectric Mirror, 350 - 400 nm, 10 Pack, Ø1/2" Broadband Dielectric Mirror, 400 - 750 nm, Ø1/2" Broadband Dielectric Mirror, 400 - 750 nm, 10 Pack, 1/2" x 1/2" Broadband Dielectric Mirror, 400 - 750 nm, Ø1/2" Broadband Dielectric Mirror, 750 - 1100 nm, Ø1/2" Broadband Dielectric Mirror, 750 - 1100 nm, 10 Pack, 1/2" x 1/2" Broadband Dielectric Mirror, 750 - 1100 nm, Ø1/2" Broadband Dielectric Mirror, 1280 - 1600 nm, Ø1/2" Broadband Dielectric Mirror, 1280 - 1600 nm, 10 Pack, Ø19.0 mm Broadband Dielectric Mirror, 350 - 400 nm, Ø19.0 mm Broadband Dielectric Mirror, 400 - 750 nm, Ø19.0 mm Broadband Dielectric Mirror, 750 - 1100 nm, Ø19.0 mm Broadband Dielectric Mirror, 1280 - 1600 nm, Ø1" Broadband Dielectric Mirror, 350 - 400 nm, Ø1" Broadband Dielectric Mirror, 350 - 400 nm, 10 Pack, Ø1" Broadband Dielectric Mirror, 400 - 750 nm, Ø1" Broadband Dielectric Mirror, 400 - 750 nm, 10 Pack, 1" x 1" Broadband Dielectric Mirror, 400 - 750 nm, Ø1" Broadband Dielectric Mirror, 750 - 1100 nm, Ø1" Broadband Dielectric Mirror, 750 - 1100 nm, 10 Pack, 1" x 1" Broadband Dielectric Mirror, 750 - 1100 nm, Ø1" Broadband Dielectric Mirror, 1280 - 1600 nm, Ø1" Broadband Dielectric Mirror, 1280 - 1600 nm, 10 Pack, Ø2" Broadband Dielectric Mirror, 350 - 400 nm, Ø2" Broadband Dielectric Mirror, 350 - 400 nm, 10 Pack, Ø2" Broadband Dielectric Mirror, 400 - 750 nm, Ø2" Broadband Dielectric Mirror, 400 - 750 nm, 10 Pack, 2" x 2" Broadband Dielectric Mirror, 400 - 750 nm, Ø2" Broadband Dielectric Mirror, 750 - 1100 nm, Ø2" Broadband Dielectric Mirror, 750 - 1100 nm, 10 Pack, 2" x 2" Broadband Dielectric Mirror, 750 - 1100 nm, Ø2" Broadband Dielectric Mirror, 1280 - 1600 nm, Ø2" Broadband Dielectric Mirror, 1280 - 1600 nm, 10 Pack, Ø3" Broadband Dielectric Mirror, 400 - 750 nm, Ø3" Broadband Dielectric Mirror, 750 - 1100 nm, Ø4" Broadband Dielectric Mirror, 400 - 750 nm, Ø4" Broadband Dielectric Mirror, 750 - 1100 nm, Excellent Reflectance Over Specified Wavelength Ranges and Angles of Incidence, Round Mirror Diameters: 7.0 mm, 1/2", 19.0 mm, 1", 2", 3", or 4", Square Mirror Edge Lengths: 1/2", 1", or 2", 350 - 400 nm (Not Stocked with Ø7.0 mm, Ø3", Ø4", or Square Substrates), 1280 - 1600 nm (Not Stocked with Ø3", Ø4", or Square Substrates), The power density of your beam should be calculated in terms of W/cm.

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