Description
Vacuum Cell & Vacuum Spatial Filter for Pulsed Lasers
Vacuum Spatial Filter (VSF), is a vacuumized borosilicate glass cell at which center lays titanium pinhole. Spatial filter, a usual technique used to improve laser beam quality by removing noise from laser beams and resulting a smooth intensity profile. Since pulsed lasers have much higher pike power, vacuum cell is the only alternative, therefore a microscope objective (used to use for CW lasers) cannot be used to focus pulsed laser beams in to a pinhole because of COD.
Vacuum cells (VC), vacuumized borosilicate glass cell with vacuum of up to 10-5 mbar level. Pulsed laser manufacturers or laser photonics folks using Relay imaging systems to control diffraction and preserving the spatial structure of laser beam. The focal plane of Kepler telescope is weakest part of such systems frequently leading to air-breakdown. The best solution is a focal plane being situated in the glass Vacuum Cell (VC). Geola Digital designs and manufactures Vacuum Cells, which are intended for pulsed laser application. The cells can be manufactured with pinhole at the center (VSF) or without pinhole inside the cell (VC).
Typical VSF & VC Specifications*
| Specification | Value |
|---|---|
| Cell Material | Borosilicate or Molybdenum Glass |
| Pinhole Material | Stainless steel, Titan or Tungsten |
| Cell Diameter | ⌀5 mm, ⌀6 mm, ⌀8 mm, ⌀9 mm, ⌀10 mm, ⌀14 mm, ⌀16 mm, ⌀19 mm, ⌀20 mm, ⌀38 mm |
| Cell Length** | from 100 mm to 1000 mm |
| Vacuum | up to 10-5 mbar |
| Windows Material | BK7 or UVFS |
| Windows Coatings1 | AR/AR @ 1064nm, AOI = 0° |
| Windows Thickness2 | from 5 mm to 8 mm |
| Cell Windows Geometry | || or / \ or \\ |
| Mechanical X&Y Adjustment | X&Y / X / Y |
| Windows Surface Quality | 20-10 Scratch-Dig |
| Window Flatness | ≥ λ/4 |
| Default Beam Center Height3 | 25mm, 50mm |
** Maximum cell length is dependent on glass tube diameter. Cell lengths >600 mm is subject for separate consideration
1 Other coating available on request
2 Build in lenses instead of windows are also available
3 Customized beam heights are also available on request
Features
- Long lasting vacuum levels
- Variety of available cell diameters and lengths
- Different window geometries
- Tunable adjustment mounts
- Custom made designs are welcome
Application
- Vacuum Spatial Filtering
- Pulsed laser beam Cleaning
- Relay Imaging with Vacuum cell
- Diffraction suppression via Relay imaging
- Air-breakdown elimination
Dimensions**
Ordering information
