Low GDD Ultrafast Mirrors for 1760 nm - 2250 nm
![](https://www.thorlabs.de/Images/GuideImages/8226_MIRUlrafastMirrors_2.jpg)
- High Reflectance Over 1760 nm - 2250 nm
- Group Delay Dispersion < 30 fs2
- Ideal for Femtosecond Thulium (Tm)
and Holmium (Ho) Lasers
UM10-45D
Ø1"
UM05-45D
Ø1/2"
Application Idea
UM05-45D Low GDD Mirror in a
POLARIS-K05F1 Low-Distortion Mount
and Mounted with a POLARIS-CA1
Clamping Arm
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Item # | UM05-45D | UM10-45D |
---|---|---|
Design Wavelength Range | 1760 - 2250 nm | |
Diameter | 1/2" (12.7 mm) | 1" (25.4 mm) |
Diameter Tolerance | +0.00 / -0.10 mm | |
Thickness | 6.4 mm (0.25") | 9.5 mm (0.37") |
Thickness Tolerance | ±0.20 mm | |
Clear Aperture | >80% of Diameter | |
Reflectance | Rs > 99% (1760 - 2250 nm) Rp > 99% (1900 - 2050 nm) |
|
Angle of Incidence | 45° | |
Group Delay Dispersion | |GDDs| < 30 fs² (1760 - 2250 nm) |GDDp| < 30 fs² (1900 - 2050 nm) |
|
Substrate | Fused Silica | |
Front Surface Flatness | λ/6 at 632.8 nm Over Clear Aperture |
λ/4 at 632.8 nm Over Clear Aperture |
Front Surface Quality | 15-5 Scratch-Dig | |
Parallelism | ≤3 arcmin | |
Back Surface | Polished |
Features
- Low Group Delay Dispersion: |GDD| <30 fs2
- Ideal for Pulses Shorter than 250 fs
- Reflectance Greater than 99%
- Ø1/2" and Ø1" Mirrors Available
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°.
![Reflectivity](https://www.thorlabs.de/images/TabImages/UMxx-45D_Reflectance_G1-400.gif)
Click to Enlarge
Click for Raw Data
The shaded region represents the specified wavelength range where RS>99%.
![GDD](https://www.thorlabs.de/images/TabImages/UMxx-45D_GDD_G1-400.gif)
Click to Enlarge
Click for Raw Data
The shaded region represents the specified wavelength range where S-Polarization GDD<|30 fs2|. The GDD values fluctuate rapidly outside of this region.
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Thorlabs offers a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see below for more information.
Low-GDD Mirrors | |||||
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355 - 445 nm | 460 - 590 nm | 700 - 930 nm | 970 - 1150 nm | 1400 - 1700 nm | 1760 - 2250 nm |
Dielectric Mirror | High-Power Mirrors for Picosecond Lasers |
Metallic Mirrors | Low-GDD Pump-Through Mirrors |
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Dual-Band Dielectric Mirror, 400 nm and 800 nm |
Ytterbium Laser Line Mirrors, 250 nm - 1080 nm |
Ultrafast-Enhanced Silver Mirrors, 750 - 1000 nm |
Protected Silver Mirrors, 450 nm - 20 µm |
Unprotected Gold Mirrors, 800 nm - 20 µm |
Pump-Through Mirrors, 1030 - 1080 nm and 940 - 980 nm |
Deterministic GDD Beamsplitters |
Low-GDD Harmonic Beamsplitters |
Low-GDD Polarizing Beamsplitters |
β-BBO Crystals | Dispersion-Compensating Optics | |
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Beamsplitters & Windows, 600 - 1500 nm or 1000 - 2000 nm |
Harmonic Beamsplitters, 400 nm and 800 nm or 500 nm and 1000 nm |
High-Power, Broadband, High Extinction Ratio Polarizers, 700 - 1300 nm | β-BBO Crystals for Second Harmonic Generation |
Dispersion-Compensating Mirrors, 650 - 1050 nm |
Dispersion-Compensating Prisms, 700 - 900 nm |