Diffraction GratingsNIR High Efficiency Gratings for S- polarization

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(2) 94% 60x30x10
G-NIR-110-
6030-N
1100 92% 60x30x10
G-NIR-110-
6030-S
1100 λ/4(2) 92% 60x30x10

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 (vacuum evaporation) 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 rittow 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.

Relative Efficiency

Relative Efficiency

Outline Drawing

Outline Drawing