Low Stray Light Diffraction Gratings
Shimadzu’s new holographic exposure method and optimized etching process have made it possible to produce both high-efficient and exceptionally low stray light gratings.
Features
LO-RAY-LIGH® has guaranteed values of stray light at the intermediate position between zero-order and + first-order lights. The values are measured by Shimadzu's laser stray-light-measuring system.
1. Low Stray Light Values
The stray light values are at less than half of conventional gratings.
Comparison of Conventional Diffraction Gratings vs Low Stray Light Diffraction Grating (LO-RAY-LIGH®)
Schematic of Measuring System
2. Vicinity of First-Order Light
The light intensity at vicinity of first-order light of LO-RAY-LIGH® looks like a profile as if being the silhouette of the mermaid line into the deep sea.
*LO-RAY-LIGH and the LO-RAY-LIGH logo are registered trademarks of Shimadzu Corporation in the U.S. 3. Relative Diffraction efficiency
LO-RAY-LIGH® is high efficient.
* These relative diffraction efficiency data are not the guaranteed values but representative ones.Features
Schematic of Shimadzu Laser Stray Light Measuring System
Schematic of Light Intensity in Vicinity of First-Order Light Measuring System
Standard List
| Code Number | Groove Density (grooves/mm) |
Blaze Wavelength (nm)*1 |
Stray Light Values*2 |
DimensionsW x H x T (mm) |
|
|---|---|---|---|---|---|
| LS120-025-3010 | 1200 | 250 | 2 x 10-6(max.) | 30 x 30 x 10 | |
| LS120-025-6010 | 1200 | 250 | 2 x 10-6(max.) | 60 x 60 x 10 | |
| LS120-050-3010 | 1200 | 500 | 2 x 10-6(max.) | 30 x 30 x 10 | |
| LS120-050-6010 | 1200 | 500 | 2 x 10-6(max.) | 60 x 60 x 10 | |
| LS120-060-3010 | 1200 | 600 | 2 x 10-6(max.) | 30 x 30 x 10 | |
| LS120-060-6010 | 1200 | 600 | 2 x 10-6(max.) | 60 x 60 x 10 | |
| LS180-025-3010 | 1800 | 250 | 2 x 10-6(max.) | 30 x 30 x 10 | |
| LS180-025-6010 | 1800 | 250 | 2 x 10-6(max.) | 60 x 60 x 10 | |
| LS180-050-3010 | 1800 | 500 | 2 x 10-6(max.) | 30 x 30 x 10 | |
| LS180-050-6010 | 1800 | 500 | 2 x 10-6(max.) | 60 x 60 x 10 | |
Standard Specifications
| Grating Type | Equally spaced straight-groove replica grating*3 | |
|---|---|---|
| Blank Material | Soda glass | |
| External Dimension Tolerance | ±0.1(W) x ±0.1(H) (mm) | |
| Thickness Tolerance | ±0.5(T) (mm) | |
| Effective Area | Total area less a 2-mm strip around the perimeter | |
| Groove Density Tolerance | ±0.5 grooves/mm | |
| Diffraction Wavefront Accuracy | Within 2λ(+1st-order light, λ = 632.8nm) | |
| Coating | Aluminum (Al) | |
| Scratches and Digs | 80-50 (In accordance with MIL-O-13830A) | |
- ※RoHS compliant (Directive 2011/65/EU + (EU)2015/863 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment)
Outline Drawing of Diffraction Grating
- *1: The blaze wavelengths is the wavelength of the maximum diffraction efficiency with the design in littrow mounting. No one to guarantee the wavelength of the maximum diffraction efficiency.
- *2: These indicate the ratio of the diffracted light intensity to the incident intensity of 473nm laser. The diffracted light is detected of mid-point between zero- and first-order light at the deviation angle 2K of 27 degree.
- *3: The grating grooves are formed with resign.
