Average linear power density can be calculated using the equation below. Calcite's transmittance of light near 350 nm is typically around 75% (see.

For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects. Collectively, our line of wire grid polarizers offers coverage from the visible range to the beginning of the Far-IR range. Kind Regards... Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). These LIDT values are not valid for ultrashort pulses less than one nanosecond in duration. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. Now compare the maximum power density to that which is specified as the LIDT for the optic. However, other wavelengths and units with an integrated quarter-wave plate (to function as a manual polarimeter) are available by request. The SM05PM5 provides SM05 compatibility for pre-mounted polarizers with Ø5 mm clear apertures, while the SM1PM10 and SM1PM15 provide SM1 compatibility for polarizers with Ø10 mm or Ø15 mm clear apertures, respectively. Thank you for contacting Thorlabs. 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. This calculation assumes a uniform beam intensity profile.

You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density. This graph was obtained from [1]. [4] N. Bloembergen, Appl. 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. 12, 661 (1973). Thorlabs offers a diverse range of polarizers, including wire grid, film, calcite, alpha-BBO, rutile, and beamsplitting polarizers. Please note that the thin film in these polarizers is very delicate and should not be touched. The AR coating used for these polarizers is designed for 350 - 700 nm and has an average reflectance of <1% over the AR coating range, however, calcite's transmittance is diminished in the UV (see Graphs tab above for transmission and reflectance curves). 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.

Our nanoparticle linear film polarizers provide extinction ratios as high as 100 000:1. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Average linear power density can be calculated using the equation below. Rev. This calculator assumes a Gaussian beam profile, so a correction factor must be introduced for other beam shapes (uniform, etc.). The orientation of the wave plate controls how much energy is in the beam.

The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF. This coating reflects s-polarized light, while transmitting p-polarized light. A histogram such as that below represents the testing of one BB1-E02 mirror. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application. Remove the SM1RR retaining ring that comes with the PRM1 rotation mount. Mounted Glan-Laser Polarizer, Ø5 mm CA, Uncoated, Mounted Glan-Laser Polarizer, Ø10 mm CA, Uncoated, Unmounted Glan-Laser Polarizer, Ø10 mm CA, Uncoated, Mounted Glan-Laser Polarizer, Ø15 mm CA, Uncoated, Mounted Glan-Laser Polarizer, Ø5 mm CA, AR Coating: 350 - 700 nm, Mounted Glan-Laser Polarizer, Ø10 mm CA, AR Coating: 350 - 700 nm, Unmounted Glan-Laser Polarizer, Ø10 mm CA, AR Coating: 350 - 700 nm, Mounted Glan-Laser Polarizer, Ø15 mm CA, AR Coating: 350 - 700 nm, Mounted Glan-Laser Polarizer, Ø5 mm CA, AR Coating: 650 - 1050 nm, Mounted Glan-Laser Polarizer, Ø10 mm CA, AR Coating: 650 - 1050 nm, Unmounted Glan-Laser Polarizer, Ø10 mm CA, AR Coating: 650 - 1050 nm, Mounted Glan-Laser Polarizer, Ø15 mm CA, AR Coating: 650 - 1050 nm, Mounted Glan-Laser Polarizer, Ø5 mm CA, AR Coating: 1050 - 1700 nm, Mounted Glan-Laser Polarizer, Ø10 mm CA, AR Coating: 1050 - 1700 nm, Mounted Glan-Laser Polarizer, Ø15 mm CA, AR Coating: 1050 - 1700 nm, Mounted Glan-Laser Polarizer, Ø5 mm CA, 1064 nm V-Coating, Mounted Glan-Laser Polarizer, Ø10 mm CA, 1064 nm V-Coating, Mounted Glan-Laser Polarizer, Ø15 mm CA, 1064 nm V-Coating, MIR Wire Grid Polarizers on Silicon Substrates, Click on the red Document icon next to the item numbers below to access the Zemax file download.

My beam is around 60µrad and I try to image it on a camera with 100mm focal length lenses and another one around 1m FL. Thank you for contacting Thorlabs. Finally, our alpha-BBO (UV), calcite (visible to Near-IR), rutile (Near-IR to Mid-IR), and yttrium orthovanadate (YVO4) (Near-IR to Mid-IR) polarizers each offer an exceptional extinction ratio of 100 000:1 within their respective wavelength ranges. The pulse length must now be compensated for.

The ordinary rays are reflected at each interface, causing them to be scattered and partially absorbed by the polarizer housing. In our mounted Glan-Thompson polarizers, this birefringence causes the selective reflection and absorption of one polarization state of an incident beam and the transmission of the other orthogonal polarization state. We are looking at 5-10ns pulses. Available unmounted or mounted in cubes for cage system compatibility.

The transmission curves for calcite are valid for linearly polarized light with a polarization axis aligned with the mark on the polarizer's housing. I will contact you directly for further troubleshooting. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. This can be compared to the LIDT values for a WPQ10E-980 polymer zero-order quarter-wave plate, which are 5 W/cm for CW radiation at 810 nm and 5 J/cm2 for a 10 ns pulse at 810 nm.

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