Refractive Optics

The use of refractive optics in the synchrotron community is becoming more and more widespread. After some reluctance, over the last couple of years, many beamline users have recently discovered the advantages of refractive beryllium lenses. The lenses are now close to perfect parabolic for both 2D and 1D focusing.

JJ X-Ray has been working with refractive beryllium lenses, both scientifically and commercially, for many years and share the enthusiasm of their outstanding performance regarding both ease of use, alignment and their close to perfect focusing.

Be 2D-lenses Al 2D-lenses 1D Be-lenses 1D Al-lenses
    Length 2.5mm Length 2.5mm
R (µm) 2R0 (µm) R (µm) 2R0 (µm) R (µm) 2R0 (µm) R (µm) 2R0 (µm)
50 447 50 447        
100 632 100 632        
200 894 200 894 200 894 200 894
300 1095 300 1095 300 1095 300 1095
500 1414 500 1414 500 1414 500 1414
1000 2000 1000 2000 1000 2000 1000 2000
1500 2449            
2000 2828            
>2500 On request            

We work with lenses from RXOPTICS, and they are available in the above configurations, both in beryllium and aluminum.

The lenses are used in a water-cooled setup as collimating lenses upstream in the white undulator beam or in a non-cooled setup for focusing of the monochromatic beam.

The total focal f length of a stack of N lenses in the thin lens approximation is given by:

where R is the apex radius of curvature and δ is the real part of the refractive index.

You will find more details about the individual refractive optics and find examples of their integration in systems made by JJ X-Ray by clicking on the individual refractive optics in the menu to your left.