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Cell construction specifications

All the cells Starna manufacture, unless specifically designed otherwise, are assembled using the ‘fully fused’ method. This technique, pioneered and perfected by Optiglass Limited (a wholly owned subsidiary of the Starna international group of companies), ensures that cells are fused into a single homogeneous unit by heat alone, using no intermediate adhesives. The cells achieve maximum physical strength as well as being unaffected by solvents.

All cells are carefully annealed to remove any residual strain left from the fusing process and, with few exceptions, can be used safely with pressure differentials of up to three atmospheres.

General Specifications:

Windows parallel to:

better than 3 minutes of arc

Window flatness to:

less than 4 Newton fringes

Window polish:

60/40 scratch/dig

Material:

Path lengths

Tolerance

Optical Glass

up to 20mm

+/- 0.1mm

Optical Glass

30 to 100mm

+/- 0.2mm

.

.

.

Special Optical Glass

up to 20mm

+/- 0.01mm

Special Optical Glass

30 to 100mm

+/- 0.02mm

.

.

.

Quartz

up to 0.05mm

+/- 0.001mm

Quartz

0.1 to 0.4mm

+/- 0.005mm

Quartz

0.5 to 100mm

+/- 0.01mm

The cells can be used with most solvents and acidic solutions.

Acids such as HF should be avoided as they will attack the quartz itself while most other acids will not affect the cells. Strongly basic solutions (pH 9.0 and above) will etch the surface of the windows and shorten the useful life of the cells

Material Specifications

Starna offer four primary window materials, Optical Glass, Special Optical Glass for the visible range, Spectrosil® Quartz for the far UV range and Infrasil® Quartz or equivalent for the near infrared. Other window materials are available such as Borofloat (PX), UV Silica (HH), Spectrosil ® WFQuartz (WF) and Suprasil® 300. If a material required is not shown please contact us for availability.

All materials used are fully guaranteed to transmit greater than 80% in the following usable wavelength range:

Optical Glass G

334 through 2500 nm

Special Optical Glass SOG

320 through 2500 nm

Borofloat PX

325 through 2500 nm

UV Silica HH

220 through 2500 nm

Spectrosil® Quartz Q

190 through 2700 nm

Infrasil® I

220 through 3800 nm

Suprasil® 300 Quartz SX

190 through 3500nm

For fluorescent applications Spectrosil is recommended as it does not exhibit any background fluorescence. Some other materials, especially Glass and lower grades of quartz may have some background fluorescence.

Standard window thickness is 1.25mm, polished to a flatness tolerance of better than 4 Newton Fringes per centimetre in the viewing area. They are typically flat to better than 1 micron (0.001mm) over the whole window area. The scratch and dig specification for surface polish is 60/40.

The meticulous care taken in the preparation and construction of regular quartz fluorescent cells allows for normal tolerances to be sufficiently stringent for use in laser applications. Starna also manufactures a variety of Laser cells for specific applications, including both Axicon and Bethune Dye Laser cells.
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