NIR Beam Expander
Laser Beam Expanders are used to increase diameter of available beam to required diameter. They are essentially afocal systems i.e. they receive parallel beam and after expansion the output is an expanded collimated beam. Although these expanders are designed for specific wavelength or wavelength range for wave-front correction better than prescribed in catalog. they may be used for nearly wavelengths to produce collimated output, by translating the output lens. The translation provided in the output lens is without rotation; hence beam wander or beam walk-off due to rotation of element is avoided.
The Beam Expander has C-mount external threads at input. The beam expanders may be mounted at the line marked on its center of gravity for effective vibration free mounting.
Application Notes
- Beam Expanders in long range systems : In systems, where there are long beam path and beam needs to be collimated throughout; then beam expaders are placed at intermediate positions to keep beam collimated at a particular expansion ratio.
- Beam Expanders are Galilean: The main advantage of galilean design is that it never focuses a collimated beam to a point, so effects associated with high power density such as dielectric breakdown are more avoidable than with focusing designs such as the Keplerian designs.
- Applications: Main application of beam expanders are in laser ranging, interferometry applications, remote sensing, etc.
- Beam Expanders for power reduction: Wavelengths after visible region are capable of producing heating effects; and using a small diameter IR beam in big system can cause heating effects where-ever it strikes/reflects, hence by expanding this beam by minimum 2x we can reduce the power density of laser by 4 times, therefore we recommend usage of beam expanders in IR systems for long life of system and its components.
Specification
Note: 1. Title of the series is the maximum input beam permitted in the system, like 2 mm aperture means maximum allowed beam diameter is 2 mm.
2. Input and Output apertures are clear apertures of this optical system at input and output.
3. Input aperture is kept double the beam diameter in accordance to apodization cut-off.
4. Output aperture is kept +2 mm so as to prevent beam from vignetting at inner diameter of housing.
5. For customized designs, you can mail us your requirement and we will make it happen.
Product Matrix
2mm aperture NIR
| Quantity | Doc | Part Number | Input Aperture | Output Aperture | Expansion | Wave-Front Distortion @750 - 1050 nm | |
|---|---|---|---|---|---|---|---|
| L04-NIR.BXP-2-02X | 4 | 6 | 2x | lambda/4 | |||
| L10-NIR.BXP-2-02X | 4 | 6 | 2x | lambda/10 | |||
| L04-NIR.BXP-2-03X | 4 | 8 | 3x | lambda/4 | |||
| L10-NIR.BXP-2-03X | 4 | 8 | 3x | lambda/10 | |||
| L04-NIR.BXP-2-05X | 4 | 12 | 5x | lambda/4 | |||
| L04-NIR.BXP-2-10X | 4 | 22 | 10x | lambda/4 | |||
| L04-NIR.BXP-2-15X | 4 | 32 | 15x | lambda/4 | |||
| L04-NIR.BXP-2-20X | 4 | 42 | 20x | lambda/4 |