Low GDD Ultrafast Mirrors for 460 - 590 nm

Designed for 2^nd Harmonic of Yb:Glass, Yb:YAG, and Nd:YAG Lasers
Greater than 99% Reflectance over 460 - 590 nm
Group Delay Dispersion < 30 fs²

UM10-45G

(Ø1")

UM05-45G

(Ø1/2")

Application Idea

UM10-45G Mounted in a Ø1" Polaris Mount

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Overview
Graphs
Nd:YAG Optics
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Ultrafast Optics

Item #	UM05-45G	UM10-45G
Design Wavelength Range	460 - 590 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	R_s > 99% (460 - 590 nm) R_p > 99% (480 - 560 nm)
Angle of Incidence	45°
Group Delay Dispersion	\|GDD_s\| < 30 fs² (460 - 590 nm) \|GDD_p\| < 30 fs² (480 - 560 nm)
Substrate	Fused Silica
Front Surface Flatness	λ/10 at 632.8 nm Over Clear Aperture
Front Surface Quality	20-10 Scratch-Dig
Parallelism	≤3 arcmin
Back Surface	Polished

Features

Designed for Frequency-Doubled Ultrafast Yb and Nd Lasers
Ideal for Laser Pulses Shorter than 250 fs
Low Group Delay Dispersion: |GDD| < 30 fs²
Available in Ø1/2" and Ø1" Sizes
For Use at 45° AOI

These Low Group Delay Dispersion (GDD) Ultrafast Mirrors provide high reflectance and low group delay dispersion in the 460 - 590 nm range. This wavelength range is optimized for the second harmonic of Ytterbium (Yb) and Neodymium (Nd) 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 the low GDD mirrors here, Thorlabs also offers low GDD mirrors for various other wavelength ranges. For mirrors designed for the fundamental harmonic of Ytterbium (Yb) and Neodymium (Nd) lasers, see our Low GDD Ultrafast Mirrors for 970 - 1150 nm. For our full selection of optics for ultrafast applications, please see the Ultrafast Optics tab.

The graphs below are theoretical results of the reflectance and the group delay dispersion and represent typical performance of the coating. Both plots are shown for an AOI of 45°.

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Click Here for Raw Data
The shaded region represents the specified wavelength range where R_s > 99%.

Click to Enlarge
Click Here for Raw Data
The shaded region represents the wavelength range where |GDD| < 30 fs² for s-polarized light. The GDD values fluctuate rapidly outside of the design wavelength range.

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			Objectives

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	High Power Focusing Objectives, 1064 nm, 532 nm
Lenses		Filters

UVFS Plano-Convex Lenses: 532 nm/1064 nm: Unmounted or Mounted 532 nm: Unmounted 1064 nm: Unmounted	Air-Spaced Doublets, 1064 nm, 532 nm	Laser Line Filters, 1064 nm: Standard or Premium	Laser Line Filters, 532 nm: Standard or Premium

Posted Comments:

Fernando Manuel DA SILVA RIBEIRO (posted 2021-07-07 02:27:38.897)

Dear Mr(s). Do you have the damage threshold data for this mirrors? I am particularly interested in the 515nm wavelength in the nano- and femto- second regimes. How they compare with the UM10-Y2HP?

YLohia (posted 2021-07-12 08:05:43.0)

Hello, please see our comment below (dated 2018-10-04) on the damage thresholds of these mirrors. The test parameters were 200 fs pulses at 200 kHz rep rate. Unfortunately, we do not have data for ns regimes at the moment, so we suggest following the same damage threshold guidelines as the femtosecond regime.

Peter.Butler (posted 2018-10-03 09:27:04.29)

Please you provide the damage threshold for these mirrors. I am particularly interested in using these mirrors with a 517 nm expanded to 8 mm diameter beam, up to 4 nJ per pulse, PRF 75 MHz.

YLohia (posted 2018-10-04 09:53:09.0)

Hello, thank you for contacting Thorlabs. While we have not yet obtained conclusive damage threshold test data on these mirrors yet, we do expect it to be on the order of 0.06 to 0.10 J/cm^2 at that wavelength.

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	Low-GDD, High Power, Broadband Polarizing Beamsplitter, 700 - 1100 nm	β-BBO Crystals for Second Harmonic Generation	Dispersion-Compensating Mirrors, 650 - 1050 nm	Dispersion-Compensating Prisms, 700 - 900 nm