NIR High Efficiency Gratings for S-polarization
- High relative diffraction efficiency for S-polarized near infrared light resulting in excellent performance for optical communication applications.
- Less than λ/4 diffraction wavefront accuracy at 2nd order light ( λ=632.8nm).
- Highest quality level of replicated gratings is achieved using the high accuracy holographic exposure method for the master gratings.
Code number for Standard items
| Code number | Groove density (grooves/mm) |
Diffraction Wavefront Accuracy*1 (λ=632.8nm) |
Typical Relative Efficiency*2(λ=1550nm, at S-polarization*3) | Dimensions W×H×T (mm) |
|---|---|---|---|---|
| G-NIR-095-6030-N | 950 | 2 λ | 94% | 60x30x10 |
| G-NIR-095-6030-S | 950 | λ/4 | 94% | 60x30x10 |
| G-NIR-110-6030-N | 1100 | 2λ | 92% | 60x30x10 |
| G-NIR-110-6030-S | 1100 | λ/4 | 92% | 60x30x10 |
Custom orders are also available such as 1050 grooves/mm. Please contact us if you need other than standard products.
Standard Specifications
| Grating Type | Equally spaced straight-groove replica grating*4 |
|---|---|
| Blank Material | Borosilicate glass |
| Dimensional tolerances | ±0.2(W)×±0.2(H)×±0.5(T)(mm) |
| Effective area | 56（W）x26（H）（mm） (56（W）x26（H）（mm） of ellipse for the wavefront) |
| Groove density tolerance | ±0.5 grooves/mm |
| Relative efficiency*2 | 80 % min. (λ=1550nm, at S-polarized light (TM)) |
| Coating | Au |
| Scratches and digs | 80-50 (in accordance with MIL-O-13830A) |
*1: It is measured at the second-order light of λ=632.8nm, where is close to the actually used wavelength at 1550nm.
*2: It is a value measured on littrow mounting.
*3: It is polarized light that has vibration of electric field oriented perpendicular to the direction of the grating grooves.
*4: The grating grooves are formed with resin.
※The external appearances and specifications are subject to change without notice.
※RoHS compliant (Directive 2011/65/EU + (EU)2015/863 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment)
Relative Efficiency
Outline Drawing
