Low GDD Ultrafast Mirrors for 970 nm

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Nd:YAG Optics
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Ultrafast Optics

Item #	UM05-45B	UM10-45B
Design Wavelength Range	970 - 1150 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% (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	λ/4 at 632.8 nm Over Clear Aperture	λ/6 at 632.8 nm Over Clear Aperture
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.

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 970 nm - 1150 nm 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 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 second harmonic of Nd:YAG 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.

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

Click to Enlarge
Click for Raw Data
The shaded region represents the specified wavelength range where R_S>99%.

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 the GDD design wavelength range, which is shaded in the plot.

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:

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	950 - 1170 nm	1400 - 1700 nm	1760 - 2250 nm

Metallic Mirrors			Dielectric Mirror	High-Power Mirrors for Picosecond Lasers

Ultrafast-Enhanced Silver Mirrors, 750 - 1000 nm	Protected Silver Mirrors, 450 nm - 20 µm	Unprotected Gold Mirrors, 800 nm - 20 µm	Dual-Band Dielectric Mirror, 400 nm and 800 nm	Ytterbium Laser Line Mirrors, 250 nm - 1080 nm

Dispersion-Compensating Optics		Low-GDD Harmonic Beamsplitters	Deterministic GDD Beamsplitters

Dispersion-Compensating Mirrors, 650 - 1050 nm	Dispersion-Compensating Prisms, 700 - 900 nm	Harmonic Beamsplitters, 400 nm and 800 nm or 500 nm and 1000 nm	Beamsplitters & Windows, 600 - 1500 nm or 1000 - 2000 nm

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Low GDD Ultrafast Mirrors for 970 nm - 1150 nm

Features