Low-GDD Ultrafast Mirrors for 970 - 1150 nm

Ideal for 1^st 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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Overview
Graphs
Nd:YAG Optics
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Ultrafast Optics

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

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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.

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

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 R_S > 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.

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.

Nd:YAG Optics Selection
Dielectric Mirrors			Ultrafast Mirrors

Laser Line Mirrors, 1064 nm, 532 nm, 355 nm, 266 nm	Right-Angle Prism Mirrors, 1064 nm, 532 nm	Cage Cube-Mounted Prism Mirrors, 1064 nm, 532 nm	Low GDD Ultrafast Mirrors, 1064 nm or 532 nm
Beamsplitters			Wave Plates

Harmonic Beamsplitters, 1064 nm, 532 nm, 355 nm, 266 nm	High-Power Polarizing Beamsplitter Cubes, 1064 nm, 532 nm: Unmounted or Mounted	Non-Polarizing Plate Beamsplitters, 1064 nm, 532 nm	Dual Wavelength Multi-Order Wave Plates, 1064 nm / 532 nm
Attenuators	Filters	Objectives	Doublet Lenses

Laser Beam Attenuator, 1064 nm / 532 nm	Hard-Coated Bandpass Filters, 1064 nm or 532 nm	High Power Focusing Objectives, 1064 nm, 532 nm	Air-Spaced Doublets, 1064 nm, 532 nm
Spherical Singlet Lenses

N-BK7 Plano-Convex Lenses, Unmounted: 1064 nm / 532 nm	UVFS Plano-Convex Lenses: 1064 nm: Unmounted 532 nm: Unmounted 1064 nm / 532 nm: Unmounted or Mounted	UVFS Bi-Convex Lenses, Unmounted: 1064 nm, 532 nm, or 1064 nm / 532 nm	UVFS Plano-Concave Lenses, Unmounted: 1064 nm, 532 nm, or 1064 nm / 532 nm

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

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

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

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

Low-GDD Ultrafast Mirrors, 990 - 1120 nm, 0° AOI

Zoom

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 Threshold^a	0.40 J/cm² (1030 nm, 309 fs FWHM, S-Pol, 1000 Pulses)
Substrate	Fused Silica
Front Surface Flatness^b	λ/6
Front Surface Quality	15-5 Scratch-Dig
Parallelism	≤3 arcmin
Back Surface	Polished

For ultrafast optics, the laser induced damage threshold (LIDT) is defined as the fluence (per pulse) that produces visible damage after a given number of pulses. LIDT values are not guaranteed in the ultrashort pulse regime. As such, they are provided as a service to customers.
At 632.8 nm Over Clear Aperture

Low-GDD Ultrafast Mirrors, 970 - 1150 nm, 45° AOI

Zoom

Item #	UM05-45B	UM10-45B	UM20-45B
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	R_s > 99% (970 - 1150 nm) R_p > 99% (1020 - 1080 nm)
Angle of Incidence	45°
Group Delay Dispersion	\|GDD_s\| < 30 fs² (970 - 1150 nm) \|GDD_p\| < 30 fs² (1020 - 1080 nm)
Laser Induced Damage Threshold^a	0.40 J/cm² (1030 nm, 309 fs FWHM, S-Pol, 1000 Pulses)
Substrate	Fused Silica
Front Surface Flatness^b	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

For ultrafast optics, the laser induced damage threshold (LIDT) is defined as the fluence (per pulse) that produces visible damage after a given number of pulses. LIDT values are not guaranteed in the ultrashort pulse regime. As such, they are provided as a service to customers.
At 632.8 nm Over Clear Aperture