What the component does
A patterned glass component may define a slit, aperture, coordinate field or alignment reference. Choose its optical job before choosing the pattern shape.
Optical Alignment & Custom Instrumentation
Place a defined aperture, slit or reference pattern in the optical plane where it performs a useful measurement or alignment function.
Where the component works
Locate the pattern within the optical train
- Input or imaging optics
- Patterned glass in the specified plane
- Observation or detection optics
The illustrated plane is an example. A field stop and a pupil aperture belong to different conjugate relationships.
Define the useful clear region
- Opaque region around the opening
- Slit or aperture geometry
- Relationship to the mounting datum
The clear slit highlights the active geometry; polarity and transmission are specified for the actual instrument.
How the system works together
Pattern location and mounting references connect the manufactured geometry to the optical axis. The clear aperture and coating should suit the beam and wavelength.
What an unsuitable choice changes
A precisely made pattern in the wrong optical plane can clip the wrong rays or create unwanted diffraction. Geometry alone does not define instrument performance.
Components for this application
Optical Slits on Glass
Narrow transmitted-light regions on a glass support.
Circular Apertures on Glass
Defined circular clear apertures in an opaque coating.
Fiducial Patterned Glass
Supplies a visible registration reference tied to the instrument mounting datum.
Other relevant products and configurations
Glass Gobos
Projected lines, crosses or custom reference shapes in a compatible optical instrument.
Crosshair Reticles
Reference centres for viewing and optical alignment.
Precision Grid Reticles
Instrument-integrated coordinate and alignment references.
Aperture Patterned Glass
Compare slits, circular windows and point arrays.
Pinhole Array Targets
Bright-point arrays for compatible imaging and alignment tests.
Chrome Amplitude Gratings
Periodic amplitude patterns for an optical instrument design.
Chrome Patterned Glass
Custom functional artwork combining several feature types.
Custom Glass Pattern Masters
Approved masters for repeat pattern transfer.
Precision Glass Substrates
Uncoated glass prepared for coating or optical patterning.
Optical Slit Patterns on Glass
A narrow transmitted line for selecting the instrument field or forming an alignment reference.
Optical Pinhole Patterns on Glass
A compact transmitted point for checking alignment and optical channel position.
Principles and selection details
System context
Patterned glass can establish a viewing reference, define a clear window in an opaque field or provide a periodic optical pattern. Examples include instrument crosshairs, alignment grids, glass-supported slits and spatial-reference arrays. The geometry is specified around the optical path and mechanical mounting.
Selection considerations
Determine whether the glass is observed, illuminated in transmission or used in reflection. A transparent aperture in a chromium film still has glass beneath it. For small apertures and gratings, account for diffraction and substrate transmission rather than selecting only the mechanical dimensions.
References, apertures and addressed fields
A custom instrument may need an alignment centre, a narrow viewing window or a grid that identifies repeat observation positions. These are distinct functions that can share a patterned-glass manufacturing route. Define the optical role first, then combine only the features the instrument needs.
Put the reference at the intended optical plane
Crosshairs establish centres and directions; glass slits and pinholes define transmitted regions. The aperture plane is the patterned film surface, not automatically the nearest mounting face. Review film-side position, substrate thickness and the instrument focal plane together.
Related applications
Planning your project
Patterned glass in custom instruments can provide centres, directions, transmitting windows and periodic references.
Crosshairs, grids, slits and pinholes perform different optical jobs. Define the functional plane and optical path before specifying geometry.
Does an optical pinhole go through the glass?
A chromium-film aperture transmits through glass underneath. A physical through-hole is a different structure and must be specified separately.