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Holographic diffraction gratings are commonly used in applications sensitive to stray light.
The substrate is coated with a photosensitive material. This photosensitive material-coated substrate is placed between intersecting beams of monochromatic and coherent light generated by a laser, exposing the photosensitive material. The intersecting laser beams produce a series of parallel and equidistant interference fringes, with fringe intensity varying according to a sinusoidal curve. Since the solubility of the photosensitive material is determined by the intensity of the light illuminating it, the interference fringes reveal different light intensities on the surface of the photosensitive material. A reflective film can be deposited on the substrate, and then the grating can be replicated using the same process as replicating the original grating.
Because the grating line shape and spacing are perfectly consistent, holographic gratings have no periodic or random interval errors, and therefore no ghost lines or stray light. As a result, holographic gratings produce far less stray light than staggered gratings. Our reflective holographic diffraction gratings exhibit a sinusoidal profile.
Borisun Optics offers a variety of planar holographic gratings in various sizes and line counts for your selection.
Technical Parameters with Holographic Diffraction Gratings
| Substrate Material | Float Glass |
|---|---|
| Dimensional Tolerance | ±0.5 mm |
| Thickness Tolerance | ±0.5 mm |
| Efficiency | 45%-65% @ Peak Wavelength |
| Surface Quality | 60-40 |
| Effective Aperture | 90% |
| Damage Threshold | 350 mJ/cm² @ 200 ns Pulsed Laser 40 W/cm² Continuous Laser |
Transmission Curve with Holographic Diffraction Gratings
Inventory Information with Holographic Diffraction Grating
| Wavelength (mm) | Number of lines (1/mm) | Dispersion (nm/mr) | Dimensions (mm) |
|---|---|---|---|
| UV-band | 600 | 1.67@250nm | 12.7*12.7*6mm; 25*25*6mm; 50*50*9.5mm |
| UV-band | 1200 | 0.82@250nm | 12.7*12.7*6mm; 25*25*6mm; 50*50*9.5mm |
| UV-band | 1800 | 0.54@250nm | 12.7*12.7*6mm; 25*25*6mm; 50*50*9.5mm |
| UV-band | 2400 | 0.40@250nm | 12.7*12.7*6mm; 25*25*6mm; 50*50*9.5mm |
| UV-band | 3600 | 0.25@250nm | 12.7*12.7*6mm; 25*25*6mm; 50*50*9.5mm |
| VIS-band | 1200 | 0.79@500nm | 12.7*12.7*6mm; 25*25*6mm; 50*50*9.5mm |
| VIS-band | 1800 | 0.50@250nm | 12.7*12.7*6mm; 25*25*6mm; 50*50*9.5mm |
| VIS-band | 2400 | 0.33@500nm | 12.7*12.7*6mm; 25*25*6mm; 50*50*9.5mm |
If you need to purchase stock or customize Optical Gratings, please contact our sales team:
info@corisuns.com