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Low GDD Ultrafast Mirrors for 1760 nm - 2250 nm
UM05-45D Low GDD Mirror in a
Thorlabs' Low Group Delay Dispersion (GDD) Mirrors feature a coating designed for high reflectance in the 1760 nm - 2250 nm range. The wavelength range is optimized for lasers around 2 µm in wavelength, such as thulium (Tm) and holmium (Ho) doped lasers. These mirrors are ideal for applications where pulse broadening is a concern and are designed for a 45° angle of incidence. The dielectric coating is applied with an ion-beam-sputtering (IBS) technique, providing a highly controlled and durable dielectric thin film coating.
These mirrors offer an ideal combination of greater than 99% reflectance and less than |30 fs2| GDD. For details, please see the Graphs tab.
Our low GDD mirrors are available with either a 1/2" or 1" diameter. The edge of each optic is engraved with the item number and an arrowhead pointing to the coated surface. The back surface of these mirrors is polished so that the small percentage of light that leaks through the reflective coating may be used for applications such as power monitoring.
In addition to these mirrors for 1760 - 2250 nm, Thorlabs also offers Low GDD Mirrors for various other wavelength ranges. For our full selection of optics for ultrafast applications, please see the Ultrafast Optics tab.
The graphs below are measured and theoretical results of the reflectance and the group delay dispersion, respectively, at an AOI of 45°.
Thorlabs offers a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see below for more information.