Low gdd ultrafast
Mirrors

Standard specifications
MaterialuVFs

diameter tolerance+0/-0.1 mm

thickness tolerance±0.1 mmclear aperture>90%

surface quality

20-10 s-d

Surface flatness<λ/8 @ 632.8 nm

Protective chamfers<0.25 mm x 45°

coating adhesion and durability

Per MIL-c-675a

Laser damage threshold reports

www.altechna.com/lidt

Description
Low gdd ultrafast mirrors are designed for femtosecond applications
to provide an optimized performance at certain wavelength and angle
of incidence (aoI). this is achieved by careful selection of coatingstacks to combine high reflectivity and low GDD value (from -10 fs2 to10 fs2 at design bandwidth) at the same time. such coatings are used
for external beam manipulation applications where pulse broadening
effect is undesirable. Low GDD Ultrafast mirrors are intended forti:sapphire, Nd:glass, er:glass or Ytterbium doped host based lasers
working in femtosecond regime. Variety of catalogue components
allows to choose the right mirror for fundamental wavelength as well
as for it’s harmonics.

www.phototechnica.co.jp

Features〒336-0017 埼玉県さいたま市南区南浦和 1-2-17• other dimensions and wavelengths are available in small andmass production quantities

e-mail:voc@phototechnica.co.jp

TEL:048-871-0067 FAX:048-871-0068• GDD reflectance values range from -10 fs² to 10 fs² for s polarized
light and -20 fs² to 20 fs² for p polarized light
Calculated reflectance curve of [1K00-GDD] coating
100100
AOI=0°

AOI=0°73

5060
GDD (fs²)

Reflectance (%)

80

400-50200-100
680

720

760

800

840

880

900

720

750

Wavelength (nm)

780

810

840

870

900

Wavelength (nm)Calculated reflectance curve of [1K45-GDD] coating

Calculated GDD-reflectance values of [1K45-GDD] coating
100100

AOI=45°

AOI=45°805060GDD (fs²)

Reflectance (%)→ Read further

Calculated GDD-reflectance values of [1K00-GDD] coating40
averages-polarization
p-polarization200s-polarization-50

p-polarization
-100

0
700

750

800

850

Wavelength (nm)

900

950

720

750

780

810

Wavelength (nm)

840

870

900

Low Loss Hr MirrorsFeatures• Provide maximum reflectance at certain wavelength range andcertain angle of incidence (aoI)• coatings are provided by ion beam sputtering (IBs) technique• resistant to environmental conditions• Various dimensions are available on request• Mass production capabilities: 1’000 pieces per month• High repeatability• Reflectance higher than 99.9%

Standard specifications
diameter tolerance+0/-0.1 mm

thickness tolerance±0.1 mm

Description
Low loss mirrors are also referred to as IBs mirror due to ion-beamcoating technology. The mirrors provide maximum reflectance atcertain wavelength range and certain angle of incidence (aoI).
IBs technology stands out by multiple advantages against othercoating techniques. due to fully automated control of deposition
process coatings distinguish by high repeatability, sharper features,tighter tolerances. IBS thin films feature higher density, durability,
high-damage-threshold, impenetrable to water vapor, which makethem resistant to environmental conditions such as heat, humidity
and pressure.

clear aperture>90%

surface quality

20-10 s-d

Surface flatness<λ/8 @ 632.8 nm

Protective chamfers<0.25 mm x 45°

coating adhesion and durability

Per MIL-c-675a

Laser damage threshold

IBS coatings distinguish by nearly all specification being supreme tothe ones provided by other coating technologies. It allows to minimize
scatter in the dielectric layers which is limiting factor, then reflectancehigher than 99.9% is targeted.

up to 17 J/cm² @ 1064 nm; 10ns; 10Hz

our selection of ion-beam sputtered coatings covers wavelength rangeof 343 - 1550 nm.
100

100

9080

99,99

60

Reflectance (%)

Reflectance (%)

70
45° Rp45° Rs
0° R

50
4030
2099,98

99,97
45° Rp45° Rs0° R99,96

10099,95
800

900

1000

1100

1200

1300

800900Wavelength (nm)

1000

1100

Wavelength (nm)www.phototechnica.co.jp〒336-0017 埼玉県さいたま市南区南浦和 1-2-17

TEL:048-871-0067 FAX:048-871-0068

e-mail:voc@phototechnica.co.jp

1200

1300