phase shift dielectric mirror

right-handed circularly polarized light changes to left-handed circularly polarized light and vice versa.) This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application. Could you please publish this data since it is a recurrent need of the customer as I can see from the feedback ? Zero phase shift coatings are the highest reflectivity, lowest loss coatings available for CO2 laser optics. Please contact TechSupport@thorlabs.com if you have further questions. If you have further questions, please email us at europe@thorlabs.com. Reflectivity change is not an issue. Hello I also need to know the phase of s and p polarization upon reflection for the E03 coating. Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. What is the reflectivity plot versus wavelength for unpolarized light at 0 degrees angel of incidence for the broadband dielectric-coated mirrors? the 2" mirror is too much wide for 45 degree incident angle. As described on the previous tab, LIDT values in the nanosecond pulse regime scale with the square root of the laser pulse duration: This adjustment factor results in LIDT values of 0.45 J/cm2 for the BB1-E01 broadband mirror and 1.6 J/cm2 for the Nd:YAG laser line mirror, which are to be compared with the 0.7 J/cm2 maximum energy density of the beam. Following up on the question asked by thierry.taillandier-loize: Is circular polarisation maintained at 45 degrees AOI? Response from Tim at Thorlabs: Thank you for your request. A histogram such as that below represents the testing of one BB1-E02 mirror. Dielectric mirrors exhibit retardance as a function of angle of incidence and mirror design.[1]. Maybe you could attach the drawings to kits as well? Excel Spreadsheet with Raw Data for -E01 Coating, 8° and 45° AOI, Excel Spreadsheet with Raw Data for -E02 Coating, 8° and 45° AOI, Excel Spreadsheet with Raw Data for -E03 Coating, 8° and 45° AOI, Excel Spreadsheet with Raw Data for -E04 Coating, 8° and 45° AOI. Falk Eilenberger. In principle also more extreme angles could be useful. Response from Bweh at Thorlabs USA: I will send this to you via email. If you have any concerns about the interpretation of this data, please contact Tech Support. Rev. Hi, So, the maximum energy density of this beam is ~0.7 J/cm2. For applications that would benefit from having a small portion of the beam transmitted through the optic, consider one of our backside polished mirrors. A high surface quality is often important in laser technology. In this regime, the LIDT given as an energy density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size. Is the GVD available? What is your initial beam diameter, the focal length of your focusing lens, and its NA? Response from Buki at Thorlabs: A plot of all the reflectivity of all four mirrors was added to the overview tab so that it is easy to visually determine the effective spectral range of each mirror coating. • 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. Pulsed Nanosecond Laser Example: Scaling for Different Pulse DurationsSuppose that a pulsed Nd:YAG laser system is frequency tripled to produce a 10 Hz output, consisting of 2 ns output pulses at 355 nm, each with 1 J of energy, in a Gaussian beam with a 1.9 cm beam diameter (1/e2). 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. Our mirrors can be manufactured in almost any shape: round, rectangular, elliptical, or any other shape including cut-outs and drill holes. Response from Bweh E at Thorlabs: It is possible to have this on silicon wafers. Typical mirror coatings include dielectric low-loss high reflectors (HR), multi-wavelength high reflectors, dichroic mirrors, trichroic mirrors, beam splitter mirrors, low phase shift mirrors, non-polarizing and dispersion controlled mirrors. I will contact directly with these calculations. For long pulses to CW, linear power density becomes a constant with spot size. As described on the previous tab, the LIDT value of an optic scales with the square root of the wavelength in the nanosecond pulse regime: This scaling gives adjusted LIDT values of 0.08 J/cm2 for the reflective filter and 14 J/cm2 for the absorptive filter. This graph was obtained from [1]. I will reach out to you directly to discuss this application as we do not test for the maximum temperature allowable for the -E03 coating. Is it polarized? Holes may also be drilled at an angle to the surface normal. High reflectivity is of prime importande so I am looking at dielectric instead of (protected) silver mirrors. The all-dielectric broadband reflection phase shifting mirror was fabricated with an ion beam sputtering system. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions. We specify a damage threshold of 0.5 J/cm^2 for the E03 dielectric coated mirrors under the following conditions: 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.