Suprasil® 3002

Suprasil® 3002 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-content (~1ppm OH) Suprasil® 3002 material has nearly no OH absorption bands up to 2600 nm.

Excellent index homogeneity
Suprasil® 3002 is refined to produce a high degree of index homogeneity, controlled and specified in one direction (the direction of unse or functional drection)
Suprasil® 3002 is homogeneous in the primary functional direction. Weak striations, if any, are parallel to the major faces and do not affect the optical perfomance. Suprasil® 3002 is the preferred material for demanding IR-optics in one directional use such as laser windows, optical flats or lenses.

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 3002 material features 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 3002 is pratically free from bubbles and inclusions.

Application
Suprasil 3002 is ideal for broadband applications 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
1/1*0.16 unit weight < 6 kg
1/1*0.25 unit weight 6-30 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.
Weak striations, if any, are parallel to the major faces.

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

In primary functional direction (∆n) •≤5•10^-6;on request∆n≤1•10^-6
Dimensions and weight are practically boundless

5 nm/cm over 70% of the diameter or of the side lengts
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.

Some lasers well suited for this material
ND: Yag: 266 nm, 355 nm, 532 nm, 1064 nm

ND: Glass: 1054 nm

Ytterbium: Glass: 1100 nm, 1064 nm

Er: Glass: 1534 nm

Tunable lasers
using operating ranges anywhere from 190 nm to 3000 nm
for lenses, windows laser debris shields

Laser Diode Optics
Medical Science
In the prevalent 940 nm laser-wavelength, that is used by laser diodes in the field of medical science as well as in material handling and in route guidance systems.
Telecommunications
Laser diodes optics used for 1300 to 1400 nm telecom applications can benefit from the combined low absorption and bubble free content.
Spectroscopy
The broadband (UV to NIR) characteristics transmissions of this material are ideal for spectroscopy optics covering 190 nm to 3500 nm.