Low-GDD Ultrafast Mirrors for 970 - 1150 nm
![](https://www.thorlabs.us/Images/GuideImages/7244_UltrafastMirrors_5.jpg)
- Ideal for 1st Harmonic of Yb:Glass, Yb:YAG, and Nd:YAG Lasers
- High Reflectance Over 990 - 1120 nm (0° AOI) or 970 - 1150 nm (45° AOI)
- Group Delay Dispersion: |GDD| < 30 fs2
UM10-0B
(Ø1", 0° AOI)
UM05-0B
(Ø1/2", 0° AOI)
Application Idea
UM10-45B Low-GDD Mirror in a Previous-Generation Polaris® Mirror Mount
UM20-45B
(Ø2", 45° AOI)
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Features
- Low Group Delay Dispersion: |GDD| < 30 fs2
- Ideal for Pulses Shorter than 250 fs
- Reflectance Greater than 99%
- Designed for 0° or 45° Angle of Incidence (AOI)
- Sizes Available:
- For 0° AOI: Ø1/2" or Ø1"
- For 45° AOI: Ø1/2", Ø1", or Ø2"
Thorlabs' Low Group Delay Dispersion (GDD) Mirrors feature a coating designed for high reflectance in the near IR range. The wavelength range is optimized for Ytterbium (Yb) and Neodymium (Nd) lasers. These mirrors are ideal for applications where pulse broadening is a concern and are designed for a 0° (Item #s ending in -0B) or 45° (Item #s ending in -45B) angle of incidence (AOI). 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 |GDD| less than 30 fs2. For details, please see the Graphs tab.
Our low-GDD mirrors for 0° AOI are available with a 1/2" or 1" diameter and our low-GDD mirrors for 45° AOI are available with a 1/2", 1", or 2" diameter. The edge of each optic is engraved with the item number and an arrowhead pointing to the coated surface. The back surfaces of the 1/2" and 1" mirrors are 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 the low-GDD mirrors here, Thorlabs also offers low-GDD Mirrors for various other wavelength ranges. For mirrors designed for the second harmonic of Ytterbium (Yb) and Neodymium (Nd) lasers, see our low-GDD ultrafast mirrors for 460 - 590 nm. For our full selection of optics for ultrafast applications, please see the Ultrafast Optics tab.
UMxx-0B, Low-GDD Mirrors for 990 - 1120 nm at 0° AOI
![Reflectivity](https://www.thorlabs.us/images/TabImages/UMxx-0B_Reflectance_G1-400.gif)
Click to Enlarge
Click for Raw Data
This graph shows the theoretical reflectance as a function of wavelength. Since these mirrors are designed for normal incidence, the reflectance does not vary with polarization. The shaded region represents the specified wavelength range where the absolute reflectance is >99%. Please note that the reflectance outside of this specified region is typical and can vary from lot to lot, especially where the reflectance is fluctuating or sloped.
![GDD](https://www.thorlabs.us/images/TabImages/UMxx-0B_GDD_G1-410.gif)
Click to Enlarge
Click for Raw Data
This graph shows theoretical results for the group delay dispersion (GDD). The shaded region represents the 990 nm - 1120 nm wavelength range for which GDD is specified. Since these mirrors are designed for normal incidence, the GDD does not vary with polarization.
UMxx-45B, Low-GDD Mirrors for 970 - 1150 nm at 45° AOI
![Reflectivity](https://www.thorlabs.us/images/TabImages/UMxx-45B_Reflectance_G1-400.gif)
Click to Enlarge
Click for Raw Data
This graph shows the theoretical reflectance as a function of wavelength for both s- and p-polarizations. The shaded region represents the specified wavelength range where the absolute RS > 99%. Please note that the reflectance outside of this specified region is typical and can vary from lot to lot, especially where the reflectance is fluctuating or sloped.
![GDD](https://www.thorlabs.us/images/TabImages/UMxx-45B_GDD_G1-420.gif)
Click to Enlarge
Click for Raw Data
This graph shows theoretical results for the group delay dispersion (GDD). The shaded region represents the 970 - 1150 nm wavelength range for which GDD is specified. The GDD values fluctuate rapidly outside of the specified wavelength range for s-polarized light..
Thorlabs offers a wide selection of optics optimized for use with Nd:YAG lasers. Please see below for more information.
Posted Comments: | |
XIZE Gao
 (posted 2024-02-07 19:50:13.597) Dear Thorlabs team. I wonder if the reflectivity and GDD fluctuate greatly with the angle of incidence, when the angle of incidence is less than 6 degrees? Thank you. cdolbashian
 (posted 2024-02-16 11:37:51.0) Thank you for reaching out to us with this inquiry! We would not expect the GDD and reflectivity to vary much with such a small change in AOI. I have contacted you directly to discuss this further. Egor Manuylovich
 (posted 2021-12-16 12:17:05.037) Dear Thorlabs team,
Could you provide me with the reflectance and GDD for AOI = 0°, please?
Kind regards,
Egor YLohia
 (posted 2021-12-23 01:11:03.0) Hello, additional data for these mirrors can be requested by emailing techsupport@thorlabs.com. I have reached out to you directly with a theoretical estimate. slm9
 (posted 2014-08-22 11:24:18.123) Dear Thorlabs-Team
Do you have some specs for this coating if this mirror will be used under AOI 0°? I would like to know the spectral shift and the low GDD behavior @AOI 0°.
Thanks and with best regards
Markus besembeson
 (posted 2014-08-25 06:25:53.0) Response from Bweh at Thorlabs USA: We have theoretical plots for the reflectivity and GDD when used at 0 deg in comparison to 45 deg. Our European office will followup with you by email regarding this. strotherj
 (posted 2014-03-26 15:43:56.47) It would be nice to have mirror that would do 850nm to 1050nm, these are the wavelengths used for imaging fluorescent proteins. At present we use protected silver mirrors, and just accept that we lose most of our light in the mirrors. besembeson
 (posted 2014-03-27 04:51:45.0) Response from Bweh E at Thorlabs: Thanks for contacting Thorlabs. We would look into your suggestion of having a low GDD mirror that will cover the 850nm to 1050nm range. |
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 |
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Item # | UM05-0B | UM10-0B |
---|---|---|
Design Wavelength Range | 990 - 1120 nm | |
Diameter | 1/2" (12.7 mm) | 1" (25.4 mm) |
Diameter Tolerance | +0.00 / -0.10 mm | |
Clear Aperture | >80% of Diameter | |
Thickness | 6.4 mm (0.25") | 9.5 mm (0.37") |
Thickness Tolerance | ±0.20 mm | |
Reflectance | R > 99% | |
Angle of Incidence | 0° | |
Group Delay Dispersion | |GDD| < 30 fs² | |
Laser Induced Damage Thresholda | 0.40 J/cm2 (1030 nm, 309 fs FWHM, S-Pol, 1000 Pulses) | |
Substrate | Fused Silica | |
Front Surface Flatnessb | λ/6 | |
Front Surface Quality | 15-5 Scratch-Dig | |
Parallelism | ≤3 arcmin | |
Back Surface | Polished |
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Item # | UM05-45B | UM10-45B | UM20-45B |
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Design Wavelength Range | 970 - 1150 nm | ||
Diameter | 1/2" (12.7 mm) | 1" (25.4 mm) | 2" (50.8 mm) |
Diameter Tolerance | +0.00 / -0.10 mm | ||
Clear Aperture | >80% of Diameter | ||
Thickness | 6.4 mm (0.25") | 9.5 mm (0.37") | 12.0 mm (0.47") |
Thickness Tolerance | ±0.20 mm | ±0.10 mm | |
Reflectance | Rs > 99% (970 - 1150 nm) Rp > 99% (1020 - 1080 nm) |
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Angle of Incidence | 45° | ||
Group Delay Dispersion | |GDDs| < 30 fs² (970 - 1150 nm) |GDDp| < 30 fs² (1020 - 1080 nm) |
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Laser Induced Damage Thresholda | 0.40 J/cm2 (1030 nm, 309 fs FWHM, S-Pol, 1000 Pulses) | ||
Substrate | Fused Silica | ||
Front Surface Flatnessb | λ/4 | λ/6 | <λ/3 |
Front Surface Quality | 15-5 Scratch-Dig | 20-10 Scratch-Dig | |
Parallelism | ≤3 arcmin | ≤5 arcmin | |
Back Surface | Polished | Fine Ground |