Plane Gratings for laser tuning

Standard products

Information about Gratings for laser tuning...

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

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

1.	G stands for Grazing incidence, P for Plano and L for Littrow gratings (optional information)
2.	1100 is the groove density (groove frequency) in grooves/mm
3.	W is the blank dimension in mm parallell with the grating grooves
4.	H is the blank dimension in mm perpendicular to the grating grooves
5.	Thk is the blank thickness in mm
6.	1200-1600 nm is the desired optimization range. A specific wavelength or range with peaked wavelength can also be specified
7.	(TM/-1) is desired polarization state and diffraction order the grating should be optimized for. TE and average (TM+TE)/2 can also be specified
8.	Constant incidence angle 75° is the configuration the grating should be optimized for. Constant deviation ° can also be specified

Standard tolerances on W, H, Dia: ± 0.2 mm Thk ± 0.5 mm
CA > 90 % of blank size

Standard Plane gratings for laser tuning, specified by combining from:

Grooves/mm	Sizes:	Wavelength range:
0600 0700 0750 0800 0890 0900 0930 0940 0950 0955 0975 0990 1000 1075 1100 1200 1350 1400 1500 1600 1630 2000 2100 2200 2400 2700 3000 3600	5 x 25 x 10 mm 8 x 15 x 6 mm 10 x 15 x 10 mm 10 x 20 x 10 mm 10 x 25 x 10 mm 10 x 30 x 10 mm 10 x 35 x 10 mm 10 x 50 x 10 mm 12 x 50 x 10 mm 12 x 64 x 10 mm 15 x 15 x 10 mm 15 x 20 x 10 mm 15 x 30 x 10 mm 15 x 50 x 10 mm 15 x 60 x 10 mm 20 x 90 x 20 mm 25 x 25 x 6 mm 30 x 75 x 16 mm 30 x 110 x 16 mm 60 x 140 x 20 mm 110 x 110 x 16 mm	UV 190-400 nm UV-VIS VIS 400-750 nm VIS-NIR NIR 750-1600 nm @ 248 nm @ 413 nm @ 514 nm @ 630 nm @ 633 nm @ 635 nm @ 683 nm @ 770 nm @ 780 nm @ 795 nm @ 800 nm @ 850 nm @ 910 nm @ 940 nm @ 975 nm @ 980 nm @ 1055 nm @ 1064 nm @ 1300 nm @ 1400 nm @ 1480 nm @ 1500 nm @ 1520 nm @ 1550 nm @ 1520 nm

Other specifications available on request, contact our sales department!

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 *)

Grating stock list (subject to prior sales):

Art no	Description	Optimised for (nm)	Optimised for AOI (Deg)	Min efficiency % (TM/-1)	Qty in stock
715.702.830	G 0900 6x8x5 NIR	1560	77	85	>10
715.702.360	G 0800 10x15x10 NIR	1550	57	92	>10
715.702.280	G 0900 10x15x10 NIR	1550	60	92	>10
715.702.270	G 0900 13x29x10 NIR	1550	75	85	1
715.702.300	G 0900 15x15x10 1550 nm	1550	70	90	6
715.702.290	G 0900 15x15x10 NIR	1550	75	85	>10
715.702.340	G 0900 15x20x10 NIR	1550	75	85	>10
715.702.750	G 0900 20x32x15 NIR	1550	78	82	8
715.702.390	G 0930 10x15x10 NIR	1550	75	85	>10
715.702.380	G 0955 10x15x10 NIR	1500	75	85	>10
715.702.370	G 0955 15x15x10 NIR	1500	75	85	>10
715.702.230	G 0990 10x15x10 NIR	1400	60	90	2
715.702.410	G 0990 15x15x10 NIR	1400	75	85	>10
715.702.930	G 1050 10x15x10 NIR	1310	75	85	>10
715.702.430	G 1050 15x15x10 NIR	1400	75	85	>10
715.000233	G 1100 12x64x10 NIR	1550	80	82	2
715.000230	G 1200 15x60x10 NIR	1240	85	65	3
715.000223	G 1200 20x20x6 NIR	980	75	90	4
715.000237	G 1200 20x40x6 1064 nm	1064	84	61	1
715.702.490	G 1200 25x70x10 NIR	1550	80	82	2
715.000278	G 1400 10x15x10 NIR	1300	77	87	>10
715.701.790	G 1500 10x15x6 NIR	780	85	50	5
715.000225	G 1600 10x25x10 NIR	780	75	85	9
715.702.980	G 1675 10x25x10 NIR	780	85	55	2
715.702.780	G 1700 10x25x10 NIR	780	85	50	7
715.000246	G 1800 20x70x15 VIS	650	80	70	1
715.700.790	G 2400 10x25x10 VIS-NIR	633	75	75	>10
715.000259	G 2400 10x30x6 VIS	550	80	68	5
715.000231	G 2400 15x60x10 VIS	514	85	46	4
715.702.880	G 2400 15x60x10 VIS-NIR	590	81	50	3
715.000245	G 2400 20x70x15 VIS	500	80	70	4
715.000249	G 3000 20x70x15 VIS	500	86	37	2
715.000244	G 3600 20x70x15 VIS	400	80	60	1

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 optimized to yield maximum efficiency for one state of polarization.

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 optimized to give maximum efficiency for TM polarization (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).

Measured efficiency for a 2400 gr/mm grazing incidence grating, in the VIS region. Incidence angle: 80 degrees

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.

Littrow and Grazing configuration