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Diffraction Gratings

NIR 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

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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)

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(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

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