Suprasil® 3001

Suprasil® 3001 is a high purity synthetic fused silica materials manufactured by flame hydrolysis. It combines excellent physical properties with outstanding optical characteristics in the deep UV to the near IR.

Low OH-content
Due to its low OH-conten (~1ppm OH) Suprasil® 3001 material has nearly no OH absorption bands up to 2600 nm.

Excellent index homogeneity
Suprasil® 3001 material is refined to produce a high degree of index homogeneity, controlled and specified in all three dimensions.
Suprasil® 3001 is an optically isotropic 3D-material. It is highly homogeneous and has no striations in all three dimensions. These properties are very important for multiple axis optics such as prisms, steep lenses, beam splitters, etalons or retro- reflectors and light pipes.

Low absorption
Low OH and low trace impurities combine to produce the optimal low absorption material. In addition to low UV and visible wavelength absorption, Suprasil® 3001 material feature a very low absorbtion in the range of 900 nm to 1400 nm. As Heraeus Quarzglas is not able to measure the low absorption in the range of 900 nm to 1400 nm itself, the values cannot be guaranteed. However, Heraeus Quarzglas had done external absorption measurements at 1064 nm and 1319 nm.

Typical absorption values:
Absorption at 1064 nm: 0,25 ppm/ cm
Absorption at 1319 nm: 1 ppm/ cm
(see 2.5.3)

Free from bubbles
Suprasil® 3001 is pratically free from bubbles and inclusions.

Application
Suprasil® 3001 is ideal für broadband application from UV to NIR requiring optimized material properties.

• Ideally suited for high energy lasers with the need for Lowest absorption in the range of 900 nm to 1400 nm
• Wide band application with high transmission (see below) in the range of 190 nm to 3000 nm

(Bubbles and inclusions ≤ 0.08 mm diameter are not counted)

Bubble grade
Superior to 0 (according to DIN 58927)
The sum of the cross sections of all bubbles within a piece is 0.03 mm²and is related to 100 cm³ of a volume (TBCS-value).

Bubbles according to DIN ISO 10110
1/2*0.10 unit weight < 6 kg


Inclusions
None

Refractive Index
n_C = 1,456 at 656,3 nm
n_d = 1,458 at 587,6 nm
n_F = 1,463 at 486,1 nm
n_g = 1,466 at 435,8 nm
n = 1,508 at 248 nm
at 20°C, 1 bar atmospheric pressure

Granualar structure
None

Striaton
No striations in all three dimensions, i.e. superior to striae class A according to MIL-G-174-B.

Index homogeneity (∆n)
Specified over 90% of the diameter or of the side length of a ground piece, respectively 80% for raw ingots.

in three dimensions ∆n ≤4 • 10^-6; on request ∆n ≤1 • 10^-6
Maximum weight approximate 15 kg, bigger unit weight on request

5 nm/cm over 70% of the diameter or of the side length
6 nm/cm over 80% of the diameter
5 - 15 nm/cm within the peripheral zone

Decadic absorption coefficient at 200 nm
k₂₀₀ < 0.005 cm^-1 (typical)
k₂₀₀ < 0.01 cm^-1 (specified)
Internal transmission T = 10 ^-kd
and d = wall thickness
Infrared absorption
Practically no OH absorption

Absorption at 1064 nm - typical: 0.25 ppm/cm
Absorption at 1319 nm - typical: 1 ppm/ cm

Kondilenko Co-Worker, Ginzton Lab, Stanford University, private communication, 2005

At stimulation with light at a wavelength of λ = 254 nm (Hg low pressure lamp and Schott UG 5 filter) and visual inspection.

While other Heraeus materials are ideally suited for UV or visible application, the key properties of Suprasil 3001 was designed for broadband and NIR applications.

NIR Lasers:
The combination of high material purity and low OHcontent result in exceeding low absorption at 1064 nm and other lasers wavelengths. Ideal für high power lasers operating in the near-infrared.

Tunable lasers:
using operating ranges anywhere from 190 nm to 3000 nm
for prisms, etalons, light pipes