Femtosecond Optimized High Reflector Harmonic Mirrors

These mirrors are part of the Femtosecond Optimized optics series, Newport's premier optics product line, reflecting over 99% at 267 or 400 nm. They offer near-zero Group Delay Dispersion (GDD) over small wavelength ranges around 267 or 400 nm. These harmonic mirrors allow for distortion-free manipulation of femtosecond pulses at near normal or 45° AOI.

Near zero GDD
R>99% @ 267 or 400 nm for near normal or 45° AOI
Distortion free manipulation of ultrashort femtosecond pulses
Polished back surface allows transmissions at other wavelengths
400 nm mirror doubles as harmonic beamsplitter for 800 nm

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Description	Compatibility	Wavelength Range	Material	Avail.	Price
10Q20UF.HR20Ultrafast Mirror, FemtoOptics, 25.4 mm, 3.5° AOI, HR 267 nm	UNIVERSAL	257-277 nm	N-BK7	In Stock	$446
10Q20UF.HR25Ultrafast Mirror, FemtoOptics, 25.4 mm, 45° AOI, HR 267 nm	UNIVERSAL	250-285 nm	N-BK7	In Stock	$446
10Q20UF.HR40Ultrafast Mirror, FemtoOptics, 25.4 mm, 0° AOI, HR 400 nm, HT 800 nm	UNIVERSAL	360-440 nm	N-BK7	In Stock	$336
10Q20UF.HR45Ultrafast Mirror, FemtoOptics, 25.4 mm, 45° AOI, HR 400 nm, HT 800 nm	UNIVERSAL	350-440 nm	Fused Silica	In Stock	$336

Specifications

Models
Wavelength Range	257-277 nm	250-285 nm	360-440 nm	350-440 nm
Angle of Incidence	3.5°	45°	0°	45°
Reflectivity	R>99% @ 257-277 nm	R_S>99% @ 250-285 nm, R_P>98% @ 259-275 nm	R>99.6% @ 360-440 nm, T>96% @ 500-1000 nm	R_S>99.5% @ 350-440 nm, R_P>99.5% @ 360-420 nm, T_P>96% @ 500-1000 nm
Material	N-BK7	N-BK7	N-BK7	Fused Silica
Surface Quality	10-5 scratch-dig	10-5 scratch-dig	10-5 scratch-dig	10-5 scratch-dig
Surface Flatness	λ/10 at 632.8 nm	λ/10 at 633 nm	λ/10 at 633 nm	λ/10 at 632.8 nm
Back Surface	Commercial Polished	Commercial Polished	Commercial Polished	Commercial Polished
Thickness	6.35 mm	6.35 mm	6.35 mm	6.35 mm
Thickness Tolerance	±0.1 mm	±0.1 mm	±0.1 mm	±0.1 mm
Diameter	25.4 mm	25.4 mm	25.4 mm	25.4 mm
Diameter Tolerance	+0/-0.1 mm	+0/-0.1 mm	+0/-0.1 mm	+0/-0.1 mm
Wedge	< 5 arcminutes	< 5 arcminutes	<5 arc min	< 5 arc min
Clear Aperture	≥ central 85% of diameter	> central 85% of diameter	> central 85% of diameter	> central 85% of diameter
Cleaning	Non-abrasive method, methanol or isopropyl alcohol on lens tissue recommended	Non-abrasive method, methanol or isopropyl alcohol on lens tissue recommended	See How to Clean Optics	See How to Clean Optics

Features

Reflectivity and GDD of UF.HR20 Mirror

10Q20UF.HR20 provides high reflectance and low GDD in a wavelength range of approximately 20 nm centered at 267 nm, at near normal incidence.

Reflectivity and GDD of UF.HR25 Mirror

UF.HR25 provides high reflectance and low GDD in a wavelength range of approximately 40 nm centered at 267 nm, for an angle of incidence of 45° and s-polarized light. Blue: P-Polarized Light, Red: S- Polarized Light.

Reflectivity and GDD of UF.HR40 Mirror

UF.HR40 provides reflectance higher than 99.6% and low GDD in a wavelength range of approximately 80 nm centered at 400 nm. This is the maximum bandwidth achievable in this wavelength range with absorption-free non-dispersive dielectric mirrors and supports minimum pulse durations ranging from 9 fs to 12 fs, depending on the spectral shape.

The UF.HR40 coating is very versatile. Not only is it a high reflector for 400 nm, the mirror doubles as a dichroic filter, transmitting 800 nm.

Reflectivity and GDD of UF.HR45 Mirror

UF.HR45 provides reflectance higher than 99.5% and low GDD in a wavelength range of approximately 60 nm centered at 400 nm, for an angle of incidence of 45° and p-polarized light. For s-polarized light, the bandwidth increases to 90 nm at 400 nm. This is the maximum bandwidth achievable in this wavelength range with absorption-free non-dispersive dielectric mirrors. Blue: S-Polarized Light, Red: P- Polarized Light.

The UF.HR45 coating is very versatile. Not only is it a high reflector for 400 nm, the mirror doubles as a dichroic filter, transmitting 800 nm.

FemtoOptics: The Premier Optics Product Line

FemtoOptics™ is the premier optics product line specifically optimized for femtosecond pulse manipulation. Consisting of innovative, high-quality, easy-to-use, cutting-edge optical components and assemblies, we have exceptional support and service for industrial and research applications across the world. See cross-reference information to the right.

Newport Part	FemtoOptics Part
10Q20UF.HR20	OA015
10Q20UF.HR25	OA013
10Q20UF.HR40	OA074
10Q20UF.HR45	OA075

N-BK7 Substrates

N-BK7 is a relatively hard Borosilicate glass that offers good scratch resistance with a very low level of inclusions. For more information, refer to the optical material technical note.

Fused Silica Substrates

Fused Silica is synthetic amorphous silicon dioxide of extremely high purity. This non-crystalline, colorless silica glass combines a low content of inclusions with high refractive index homogeneity, a very low thermal expansion coefficient, and excellent transmittance in the wavelength regime from UV to NIR. As a result, these mirrors will perform better with temperature fluctuations and is ideal for high-energy laser applications due to its high energy damage threshold. For more information, please see our Optical Materials technical note.