Constant Ruling Density Spherical Holographic Grating, from Jobin Yvon

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Constant Ruling Density Spherical Holographic Grating

Specifications and Control

	Ultimate Specification	Standard Specification	Control
Dimension	Up to 250 mm length
Radius of Curvature	Down to 0.01%	0.5%	Calibrated Samples LTP measurements
Slope Error	Down to 0.1 arcsec rms	0.2 arcsec rms	LTP measurements Interferometer
Microroughness	Down to 2 Å rms	5 Å rms	Micromap measurements
Substrate	Silicon Fused Silica SiC CVD
Coating	Au Pt AlMgF Ni	Cr binding layer	Quartz monitoring
Groove Density	Deviation less than 0.1 gr/mm		Moiré Fringes (JY Patent) Optical control using recording layout (JY Patent)
Efficiency	Groove depth and duty cycle ratio optimised by JY proprietary software according to required optical layout
Groove Depth	+/- 5%	+/- 10	AFM measurements
c/d Ratio	+/- 5%	+/- 10	AFM measurements

Examples of Standard Spherical Holographic Gratings