Twyman-Green
Options & Accessories
4D offers a broad array of digerging lens, beam expanders, mounts, cables and other options for our PhaseCam Twyman-Green laser Interferometers.
5-Axis Stand
This highly stable stand mounts the PhaseCam 6010 or PhaseCam 6110 and provides accurate positioning in X, Y, Z, tip and tilt.
Dovetail Mount
This mounting plate lets you securely attach a PhaseCam 6010 or PhaseCam 6110 laser interferometer to the 5-Axis stand or to your custom mounting hardware.
Diverging Lenses
Our broad line of diverging optics match the radius of curvature of your concave test surface.
Diverging lenses at 633 nm wavelength are available from EFL=7 mm through EFL=222 mm, in quality of λ/5, λ/8, or λ/10 PVr.
Divergers are also available at other visible, NIR and IR wavelengths.
Beam Expanders
A beam expander matches the wavefront to the curvature of your convex test surface.
22.5 mm and 45mm beam expanders are available for PhaseCam 633nm Twyman-Green Interferometers. The 22.5 mm expander provides 95% clear aperture, with λ/8 PVr quality. The 45mm expander provides 95% clear aperture, with λ/4 PVr quality.
Custom beam expanders are available for other sizes and wavelengths.
OAP Beam Expanders
With its dual aperture port design (a primary port in front and an auxiliary port on the side), the PhaseCam MWIR can be equipped with a side-by-side collimating beam expander like this 150 mm version.
OAP beam expanders come in 100 mm and 150 mm standard sizes PhaseCam MWIR Twyman-Green Interferometers.
300 mm custom beam expanders are available for special order.
Relay Tube
Sometimes the test apparatus, optics or other obstacles make it impossible to position the instrument and lens close enough to the test optic in order to focus. In these cases, a relay tube moves the focus range of the system away from the instrument. The standard relay tube length is 240 mm. Custom lengths are available.
The image at left shows a combination relay tube and beam expander.
Reference Optics
Cell-mounted reference spheres enable system calibration to 0.05λ accuracy. Spheres are available from NA=0.06 through NA=0.7, with either λ/10 or λ/20 PVr quality. Choose either high reflector and 4% uncoated spheres.
Cell-mounted reference mirrors with λ/20 PVr quality are available in 25mm or 50mm diameter, as high reflectors or with 4% uncoated return.
Alignment Lasers
Visible alignment lasers provide a visible beam that helps you align your infrared test setup with NIR, SWIR and MWIR PhaseCam systems.
Extended Cables
Extended cables make it possible to mount a PhaseCam in a remote location and control it from a distance. 10m and 20m kits are available for both the PhaseCam 6010 and PhaseCam 6110.