This graph was obtained from [1]. The narrowed linewidth increases the in-coupled optical power by pulling the laser close to the center wavelength of the coating, where the composite laser and external cavity typically has the lowest loss. [2] Truong GW, Winkler G, Zederbauer T, Bachmann D, Heu P, Follman D, White ME, Heckl OH, and Cole GD. "Mirror reflectometer based on optical cavity decay time." Plano and Concave (1 m Radius of Curvature) Options Available, Ø8 mm Single-Crystal GaAs/AlGaAs Optical Coating, 1064 nm or 1550 nm Center Wavelength Options, Ø1", 6 mm Thick UV Fused Silica Substrate, Ready for Optical Contacting to Spacers or Backing Rings. Cavity ring-down method; re°ectivity measurement; optical resonator. Rev. 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. Our crystalline coatings have been employed in groundbreaking experiments and cutting edge commercial systems pushing the limits of laser linewidth and cavity noise performance. These lower thresholds are due to absorption or scattering in the cement or metal coating. Clear Aperture =central 80% of diameter 12, 661 (1973). Optics Express. Wedge <3 arc min ("Eyeball" alignment should be sufficient.) 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. Contact our sales office at: For more detailed information please see our catalog content “Introduction to Low Loss optics and Cavity Ring-Down Time Measurements”. To keep the mirrors clean and prevent particulates from sticking, small Now compare the maximum power density to that which is specified as the LIDT for the optic. That leaves scatter as the remaining unknown that can simply be extracted arithmetically. The total optical loss of each mirror is measured using a custom-built cavity ring-down system [2]. Please enable JavaScript on your browser and try again. In this case, the absorptive filter is the best choice in order to avoid optical damage. Cavity ring-down Spektroskopie. The spreadsheet will then calculate a linear power density for CW and pulsed systems, as well as an energy density value for pulsed systems. As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Reflectivity (typical): 99.99% - 99.997% An AC127-030-C achromatic doublet lens has a specified CW LIDT of 350 W/cm, as tested at 1550 nm. For sales in Japan contact our rep: If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. Because of the high mirror reflectivity effective length of the light path can be as long as 10 to 100 km. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. For an explanation of why the linear power density provides the best metric for long pulse and CW sources, please see the "Continuous Wave and Long-Pulse Lasers" section below. [3] C. W. Carr et al., Phys. Please contact. Therefore a cavity ring-down setup is employed to measu­re high reflectance at least for the wavelengths 635 nm and 1064 nm. However, the large average linear power density of the laser system may cause thermal damage to the optic, much like a high-power CW beam. The retroreflection of the cavity input coupler forms an extended cavity diode laser and narrows the laser linewidth (as shown in the inset graph in Figure 3). Cavity ring-down spectroscopy is an absorption technique that is applied in atmospheric chemistry. Typical ring-down signals and the residuals generated from a least squares fit to the model. Thickness: 0.25 inch (0.635 cm) While the broadband mirror would likely be damaged by the laser, the more specialized laser line mirror is appropriate for use with this system. 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. In 1984, Anderson et. Specifications regarding this side are specified over the central Ø19.5 mm region unless otherwise noted. Ø8 mm Crystalline Mirror on Ø1" UVFS Substrate, 1064 nm, Ø8 mm Crystalline Mirror on Ø1" UVFS Substrate, 1550 nm. Mirror reflectometer based on optical cavity decay time. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). This arrangement greatly simplifies the system by removing the need for active laser stabilization. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. Now compare the maximum energy density to that which is specified as the LIDT for the optic. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm): While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. 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. In order to use the specified CW damage threshold of an optic, it is necessary to know the following: Thorlabs expresses LIDT for CW lasers as a linear power density measured in W/cm. Although research is ongoing, we note that minimum optical absorption by the coating may be observed when the polarization is aligned with the fast axis. Cavity ring-down spectroscopy (CRDS) is a highly sensitive optical spectroscopic technique that enables measurement of absolute optical extinction by samples that scatter and absorb light. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. For a Gaussian output, these specifications result in a maximum energy density of 0.1 J/cm2. Critically, this technique is impervious to source amplitude fluctuations, and less sensitive to detector linearity, detection noise, and dynamic range limitations compared to other measurement techniques.

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