Plane Gratings for laser tuning

High efficiency diffraction gratings for laser tuning

When ordering a grating, please use the following example format, or choose from the grating stock list below.

G 1100 W x H x Thk 1200-1600 nm (TM/-1) constant incidence angle 75°

  • G stands for Grazing incidence, P for Plano and L for Littrow gratings (optional information)
  • 1100 is the groove density (groove frequency) in grooves/mm
  • W is the blank dimension in mm parallell with the grating grooves
  • H is the blank dimension in mm perpendicular to the grating grooves
  • Thk is the blank thickness in mm
  • 1200-1600 nm is the desired optimisation range. A specific wavelength or range with peaked wavelength can also be specified
  • (TM/-1) is desired polarisation state and diffraction order the grating should be optimised for. TE and average (TM+TE)/2 can also be specified
  • Constant incidence angle 75° is the configuration the grating should be optimised for. Constant deviation θ° can also be specified

Grating stock list (subject to prior sales):

Note: The absolute efficiency curves shown are only representative for the stated geometry and wavelength(s) and can vary depending on use geometry and measurement technique.

Art no Description Optimised
for (nm)
Optimised
for AOI (Deg)
Min efficiency
% (TM/-1)
Qty in stock
715.706.570 G 0600 14x76x16 VIS (Z) 633 82 29 8
715.702.360 G 0800 10x15x10 NIR 1550 57 92 >10
715.702.280 G 0900 10x15x10 NIR 1550 60 92 >10
715.000036 G 0900 10x15x10 1400 nm 1400 85 60 >10
715.702.270 G 0900 13x29x10 NIR 1550 75 85 5
715.702.300 G 0900 15x15x10 1550 nm 1550 70 90 >10
715.702.290 G 0900 15x15x10 NIR 1550 75 85 7
715.702.340 G 0900 15x20x10 NIR 1550 75 85 >10
715.705.020 G 0900 30x30x6 NIR 1065 75 43 7
715.702.390 G 0930 10x15x10 NIR 1550 75 85 4
715.702.380 G 0955 10x15x10 NIR 1500 75 85 >10
715.702.230 G 0990 10x15x10 NIR 1400 60 90 0
715.702.930 G 1050 10x15x10 NIR 1310 75 85 >10
715.704.820 G 1200 15x60x10 NIR 1240 85 60 3
715.705.700 G 1200 20x20x6 NIR 980 75 90 1
715.703.290 G 1200 20x90x16 NIR 1050 80 78 2
715.704.040 G 1350 15x60x10 NIR 1240 85 60 3
715.706.230 L 1600 10x15x6 NIR 900 Dev 0-10° 90 >10
715.705.060 G 1600 10x25x10 NIR 780 75 85 2
715.705.720 G 1630 10x25x10 NIR 830 66 90 2
715.702.780 G 1700 10x25x10 NIR 780 85 50 5
715.000038 G 1800 10x20x6 NIR 633 85 62 >10
715.705.500 G 1800 10x25x6 NIR 975 75 85 8
715.704.950 G 1800 20x70x15 VIS 650 80 70 1
715.703.900 G 1800 20x90x16 VIS-NIR 800 74 80 1
715.703.650 G 1800 20x90x16 VIS-NIR 800 85 45 1
715.700.790 G 2400 10x25x10 VIS-NIR 633 75 75 9
715.705.100 G 2400 10x30x6 VIS 550 80 68 3
715.705.430 G 2400 12.5×62.5×10 VIS-NIR 575 80 65 3
715.702.880 G 2400 15x60x10 VIS-NIR 590 81 50 3
715.704.960 G 2400 20x70x15 VIS 500 80 70 4
715.703.660 G 2400 20x90x16 VIS 514 85 46 1
715.704.970 G 3000 20x70x15 VIS 500 86 37 2
715.702.760 G 3000 20x90x16 VIS 470 85 42 1
715.704.980 G 3600 20x70x15 VIS 400 80 60 1

Standard tolerances on W, H: ± 0.2 mm, Thk ± 0.5 mm. CA > 90 % of each dimension.

Other specifications available on request, contact our sales department!

Plane Gratings for laser tuning
Laser tuning gratings are holographic gratings specially designed for wavelength tuning of lasers, such as dye lasers, Ti-sapphire, or external cavity diode lasers. The groove depth is optimised to yield maximum efficiency for one state of polarisation.

Extremely low stray light
The holographic masters, used for our dye laser gratings, are fabricated with the same technique as our low stray light gratings. This results in very small amounts of scattered light, comparable to that from a good front surface aluminium mirror.

High efficiency
The groove depth of these sinusoidal groove gratings, is optimised to give maximum efficiency for TM polarisation (the electric vector perpendicular to the grooves). Depending on the wavelength and configuration, the TM efficiency may be more than 80 %, and in some cases better than 90 % (absolute efficiency).

Littrow gratings
The Littrow mount, or auto collimatlon, is the classical configuration for laser tuning. The laser beam has to be expanded by intracavity optics, in order to fill the grating aperture and obtain high resolution. The Littrow configuration is also often used for external cavity tuning of diode lasers. Especially in the NIR, very high efficiency (>90 %) can be achieved.

Grazing incidence Littman gratings
The grazing incidence, or Littman configuration is the most common configuration for dye laser tuning. No beam expansion is needed; high resolution is accomplished by illuminating the grating in a fixed grazing incidence angle. A flat, tiltable mirror is used for wavelength tuning.

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