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53.0 mm x 12.0 mm, Designed for Multiphoton Microscopy
Ø1", Compensates for
Ø1/2", Compensates for
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An example setup consisting of two UMC10-15FS chirped mirrors in POLARIS-C1G mirror mounts. These mirrors are designed with >99.5% reflectance and a low 10° AOI to support multiple reflections.
Thorlabs' Dispersion-Compensating Mirrors correct for the pulse broadening that occurs when ultrashort pulses propagate through an optical system. Ideal for use as dispersion management tools (e.g., precompensation), we offer them in two types: round mirrors that compensate for transmission through fused silica, the most common substrate for ultrafast optics; and rectangular mirrors designed for the long path lengths and optical substrates used in multiphoton microscopes.
Since a femtosecond laser pulse consists of many different wavelengths, pulse broadening (a lengthening of the temporal intensity profile) will occur when the pulse passes through a dielectric medium, like glass. This broadening is caused by the wavelength dependence of the refractive index of the optical components through which the light travels. In typical glass, shorter wavelengths have higher indices of refraction than longer wavelengths, causing shorter wavelengths to travel slower. These mirrors are specifically designed so that longer wavelengths experience larger group delay dispersion than shorter wavelengths, allowing the shorter wavelengths to "catch up" to the longer wavelengths.
The coatings on these mirrors are deposited onto the surface using ion beam sputtering (IBS). This highly repeatable and controllable technique results in durable thin film coatings with high damage thresholds.
For Thorlabs' full selection of optics for ultrafast applications, please see the Ultrafast Optics tab.
The plots below give the theoretically calculated reflectance and group delay (GD) of these mirrors and represent the designed performance. The actual performance will vary from lot to lot within the specifications given in the Specs tab. The highlighted regions represent the specified wavelength range of the mirrors.
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The laser induced damage threshold (LIDT) value of an ultrafast optic is defined as the fluence (per pulse) that produces visible damage after a given number of pulses. These LIDT values were measured with 43.2 fs FWHM pulses at 800 nm that were s-polarized. LIDT values are not guaranteed in the ultrashort pulse regime. As such, they are provided as a service to customers.
Thorlabs offers a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see below for more information.
Thorlabs' UMC05-15FS and UMC10-15FS chirped mirrors feature >99.5% absolute reflectance over the 650 - 1050 nm wavelength range. The coating is engineered such that each reflection compensates for the dispersion introduced by 1.5 mm of fused silica over the entire range. The 10° AOI allows these mirrors to perform similarly for both s- and p-polarized light, and is ideal for a compact setup where multiple reflections are needed.
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The DCMP175 consists of a pair of rectangular optics with >99% average reflectance over the 700 - 1000 nm wavelength range. These mirrors are designed to integrate with multiphoton microscopy setups, which typically include long path lengths through highly dispersive glass. The 8° AOI allows these mirrors to perform similarly for both s- and p-polarized light, and is ideal for a compact setup where multiple reflections are needed.