Blazed Holographic Gratings - Plane Gratings Family

The extremely flexible holographic technique can create many grating configurations - planar, curved (for example concave and toroidal), aberration-corrected, with uniform and non-uniform groove spacings.

Holographic gratings are the type of choice for the visible and UV. They typically exhibit less stray light and "ghosts" than classically ruled gratings, because they have fewer random and systematic imperfections.

Today, most gratings are holographically produced. The grating is made by means of interfering light patterns, produced from laser sources, on a substrate coated with photoresist film. After exposure, the pattern is etched into the substrate to make the master grating. Blazing (shaping the grooves) of the grating is accomplished by means of a chemical etch, possibly followed by an ion etch to achieve the desired blaze shape. Groove density ranges from 65 to more than 5,000 grooves/mm.

Curved gratings allow for simplified designs in aberration-corrected optical devices, because a single curved grating can often replace a plane grating and one or two curved mirrors.

The table below lists the range of plane blazed holographic gratings available from HORIBA Jobin Yvon.
The last three digits of the reference number indicate the size of the grating. Select these digits from the Size Table that appears just after the following table and replace the X's in the latter table with the digits.

In the Spectral Range column, "B" denotes blazed by ion-etching and indicates the blaze wavelength. Typically the usable efficiency range of a blazed holographic grating can be approximately calculated as 2/3 x blaze wavelength to 2 x blaze wavelength.

Blazed holographic gratings are available in sizes up to 110 mm x 110 mm.

BLAZED HOLOGRAPHIC PLANE GRATINGS
Grooves per mm	Spectral Range (nm)	Reference Number & Efficiency Curve
2400	B 250	530 13 XXX
2400	B 330	530 11 XXX
2400	B 400	530 15 XXX
1800	B 250	530 20 XXX
1800	B 400	530 18 XXX
1200	B 250	530 25 XXX
1200	B 330	530 22 XXX
1200	B 500	530 24 XXX
1200	B 630	530 27 XXX
1200	B 750	530 28 XXX
1200	B 900	530 50 XXX
950	B 900	530 60 XXX
900	B 850	530 66 XXX
600	B 500	530 29 XXX