Product: All Transmission Diffraction Gratings

Diffraction_Efficiency_CurvesTransmission gratings operate to angularly disperse incident light into a spectrum. LightSmyth’s transmission gratings utilize state-of-the-art design and wafer-scale fabrication to deliver record-breaking optical performance combined with low cost providing your optical systems with a powerful competitive edge. Each grating is a master, not a replica, resulting in low scattered light and long lasting performance.

Advantages:

    • Ultra-high efficiency
    • Ultra-low polarization-dependent loss
    • Robust dielectric materials, no polymers are used
    • Each grating is a master, ultra-low scatter
    • Highly competitive pricing; Telecordia-qualified

Applications:

    • Optical telecommunications (WSS, GRISM)
    • Remote optical sensors and spectroscopy
    • Pulse compression
    • High power lasers
    • Spectral beam combining

Specifications below are for stock gratings with various line densities and substrate dimensions that are available immediately. Transmission gratings of similar performance with other line densities, operating spectral bands, input/output beam geometries and substrate sizes can be supplied.

Polarization-Independent Telecom Transmission Gratings
P/N prefix Line Density (Lines/ mm) Line Density Uniformity (Lines/mm) Wavelength Range (nm) Angle of Incidence1 (°) Diffraction Efficiency2 (%) Insertion Loss Ripple (dB) Spectral Uniformity2 (dB) Polarization- Dependent Loss2 (dB) Spatial PDL Uniformity2 (dB) Wavefront Error (@1545 nm λ) Substrate thickness (mm)
T-940C 940.07 0.001 1525-1565 46.5+1 > 94  < 0.1  < 0.2  < 0.2  +0.05  < 0.1  0.675+0.05
T-940L 940.07 0.001 1570-1610 48.4+1 > 94  < 0.1  < 0.2 < 0.2  +0.05  < 0.1  0.675+0.05
T-940CL 940.07 0.001 1526-1610 47.5+1 > 92  < 0.1  < 0.2  < 0.2  +0.05  < 0.1  0.675+0.05
T-966C 966.18 0.001 1525-1565 48.3+1 > 94  < 0.1  < 0.2  < 0.2  +0.05  < 0.1  0.675+0.05
TRF-940C 940.07 0.001 1525-1565 46.5+1 > 94  < 0.01  < 0.2  < 0.2  +0.05  < 0.2  5.6+0.2
TRF-966C 966.18 0.001 1525-1565 48.3+1 > 94  < 0.01  < 0.2  < 0.2  +0.05  < 0.2  5.6+0.2
Notes: 1 Gratings will be highly efficient over larger range of angles – please inquire.
  2 Determined from parabolic fit of efficiency as a function of wavelength for s- and p- polarization, worst case in the wavelength range.

 

High Dispersion Single Polarization Telecom Transmission Gratings
P/N prefix Line Density (Lines/ mm) Line Density Uniformity (Lines/mm) Wavelength Range (nm) Angle of Incidence1 (°) Diffraction Efficiency2 (%) Insertion Loss Ripple (dB) Operational Polarization Spatial  Uniformity2 (dB) Wavefront Error (@1545 nm λ) Substrate thickness (mm)
T-1200C 1201.20 0.001 1529-1568 68+0.5 > 90  < 0.03  S  < 0.25  < 0.1  5.6+0.2
T-1166L 1166.18 +0.001 1572-1612 68+0.5 > 90  < 0.04  S < 0.25  < 0.1  5.6+0.2

 

Polarization Independent Datacom Transmission Gratings
P/N prefix Line Density (Lines/ mm) Line Density Uniformity (Lines/mm) Wavelength Range (nm) Angle of Incidence1 (°) Diffraction Efficiency2 (%) Operational Polarization Polarization-Dependent Loss2 (dB) Wavefront Error (@650 nm λ)
T-1400-800s 1398.60 0.001 800±20 34±1 > 94 S  < 0.3 < 0.2
T-1702-895 1702.13 0.001 850-940 49.5+1 > 90  S  < 0.3  < 0.25
T-1200-1310 1201.20 0.001 1275-1345 52.0+1 > 85  S < 0.3  < 0.25

 

Other High Efficiency Transmission Gratings
Optical
P/N prefix Line Density (Lines/mm) Line Density Uniformity (Lines/mm) Angle of Incidence1 (°) Optimal Wavelength Range1 (nm) Operational Polarization2 Diffraction Efficiency2 (%) Wavefront Error
T-1850-800s 1851.85 0.001 47.8+1 800+20 S > 94  < 0.2 λ @
operational wavelength
over 25mm
T-1200-850s 1208.46 0.001 30.7+1 850+20 S > 94
T-1500-875 1503.76 0.001 41.0+1 875+20 Any > 94
T-1400-800s 1398.60 0.001 34.0±1 800±20 S > 94
T-1850-915s 1851.85 0.001 57.9+1 915+10 S > 93
T-1500-930 1500.38 0.001 44.2+1 930+20 Any > 94
T-1600-976s 1600.00 0.001 51.3+1 976+10 S > 94
T-1850-970s 1851.85 0.001 63.9+1 970+10 S > 93
T-1739-1030s 1739.13 0.001 63.6+1 1030+10 S > 90
LSFSG-1000 1000.00 0.001 31.0+1 1040+20 Any > 94
T-1702-1050s 1702.13 0.001 63.8+1 1054+10 S > 93
T-1600-1060s 1600.00 0.001 58.0+1 1060+20 S > 93
Notes: 1 Gratings will be highly efficient over larger range of angles – please inquire.
  2 P-polarization: incident electric field vector perpendicular to grating lines.  S-polarization: incident electric field vector parallel to grating lines.

 

Mechanical3
Parameter Value Units
Width and Height Tolerance +0.2 mm
Thickness 0.675+0.050 or 0.95+0.050 (up to 10 mm custom thickness available) mm
Grating clear aperture (CA) Centered, 90% of substrate area scratch/dig
Surface quality in CA 60/40 (up to 20/10 available)
Surface quality outside of CA No requirement
Substrate Fused silica, dielectric films
Size Sizes up to 140 mm diameter are available
Notes: 3 Better tolerance and surface quality available for custom products.

 
Custom High-Efficiency Transmission Gratings
LightSmyth offers highly-efficient, ultra-low polarization-dependent-loss transmission gratings with custom line densities, sizes and angles of incidence. Our optical engineers will gladly assist with your custom application.