Gradient Output Couplers and Filters

A special machine setup is required to manufacture gradient optics that allow the central wavelength to change with its position on the substrate. So it is possible to change the optical properties without any beam displacement by shifting a rectangular plate across the beam.

Given tolerances show the minimum variation on a standard substrate 50x27 mm if the plate is shifted within about 40 mm (right-middle-left position).

Coating types

GOC

λ [nm]	right→ left T =	method
193	1% → 70%	MS
532	85% → 25%	IAD
1064	25% → 75%	IAD

Gradient Output Coupler GOC
Changes the reflection-transmission-ratio.

λ [nm]	right→ left T =	method
532	1% → 95%	IAD	GLP
1064	1% → 95%	IAD	GLP
	95% → 1%	IAD	GSP

Gradient Pass Filter GP
The incoming light passes through in one position and will be blocked in the other one, available as long pass GLP and short pass GSP.

If a GLP and GSP are used in combination, the resulting bandwidth can be varied in a large wavelength area.

GNF

λ [nm]	right→ left T =	method
808-914	1% → 90%	IAD
976-1064	0.5% → 90%	IAD

Gradient Notch Filter GNF
Transmits one wavelength and blocks another one in left position and reversely in right position.

GIF

λ [nm]	right→ left T =	method
476-514	on request	IAD

Gradient Interference Filter GIF
Gives the opportunity to select various wavelengths, e.g. for fast external change of multiline noble gas ion lasers.

All values are given for standard coatings. Customized coatings available for all types.

Coating methods available: