Microscope objective system

1. A microscope objective system comprising:

an objective, comprising a first optical element defining an illumination beam path via which illumination radiation from a source is directed onto a sample to be examined; and

a second optical element surrounding at least part of the first optical element and defining a partial detection beam path and, which together with the first optical element, defines a detection beam path via which radiation to be detected and coming from the sample is guided towards a detector;

wherein the first optical element comprises a core aperture, and the second optical element comprises a ring aperture surrounding the core aperture.

2. The microscope objective system as claimed in claim 1 , wherein the partial detection beam path begins at an end of the objective facing towards the sample.

3. The microscope objective system as claimed in claim 1 , wherein the illumination beam path has a first etendue and the detection beam path has a second etendue which is greater than the first etendue.

4. The microscope objective system as claimed in claim 1 , wherein the imaging properties of the first optical element are better than the imaging properties of the second optical element.

5. The microscope objective system as claimed in claim 1 , wherein the first optical element has a different optical imaging property than the second optical element.

6. The microscope objective system as claimed in claim 1 wherein the second optical element comprises a refractive region having positive refractive power.

7. The microscope objective system as claimed in claim 1 , wherein the first optical element is arranged within the objective such that it is nearest the sample to be examined.

8. The microscope objective system as claimed in claim 1 , wherein the partial detection beam path and the illumination beam path are arranged coaxially with respect to each other.

9. The microscope objective system as claimed in claim 1 , wherein the detection beam path extends along the illumination beam path whereby detection radiation gathered by the first optical element and detection radiation gathered by the second optical element is mixed.

10. The microscope objective system as claimed in claim 1 , further comprising a detector and a beam splitter arranged between the detector and the objective, said beam splitter directing the radiation to be detected onto the detector.

11. The microscope objective system as claimed in claim 1 , wherein the objective comprises a front optical element, a plurality of additional optical elements spaced apart from the front element and from each other, and an adjusting unit by which at least one of the additional optical elements is displaceable along the optical axis such that at least one distance between two adjacent additional optical elements is modifiable.

12. The microscope objective system as claimed in claim 11 , wherein the at least one distance is modified by the adjusting unit to displace the focal position of the objective relative to the front element in the direction of the optical axis.

13. The microscope objective system as claimed in claim 11 , wherein the at least one distance is modified by the adjusting unit as a function of the temperature of the objective to compensate for a temperature-induced imaging error of the objective.

14. The microscope objective system as claimed in claim 11 , wherein two distances are independently modified by the adjusting unit.

15. A microscope objective system comprising:

an objective, comprising a first optical element defining an illumination beam path via which illumination radiation from a source is directed onto a sample to be examined; and a second optical element surrounding at least part of the first optical element and defining a partial detection beam path and, which together with the first optical element, defines a detection beam path via which radiation to be detected and coming from the sample is guided towards a detector;

wherein the first optical element has a different optical imaging property than the second optical element; and

further wherein the first optical element has a substantially circular shape and the second optical element has a substantially annular ring shape.

16. A microscope objective system comprising:

an objective, comprising a first optical element defining an illumination beam path via which illumination radiation from a source is directed onto a sample to be examined; and

a second optical element surrounding at least part of the first optical element and defining a partial detection beam path and, which together with the first optical element, defines a detection beam path via which radiation to be detected and coming from the sample is guided towards a detector;

wherein the first optical element has a different optical imaging property than the second optical element; and

further wherein the second optical element comprises a Fresnel lens.

17. A microscope objective system comprising:

an objective, comprising a first optical element defining an illumination beam path via which illumination radiation from a source is directed onto a sample to be examined; and

a second optical element surrounding at least part of the first optical element and defining a partial detection beam path and, which together with the first optical element, defines a detection beam path via which radiation to be detected and coming from the sample is guided towards a detector;

wherein the first optical element has a different optical imaging property than the second optical element; and

further wherein the second optical element comprises a diffractive region.

18. A microscope objective system comprising:

an objective, comprising a first optical element defining an illumination beam path via which illumination radiation from a source is directed onto a sample to be examined; and

a second optical element surrounding at least part of the first optical element and defining a partial detection beam path and, which together with the first optical element, defines a detection beam path via which radiation to be detected and coming from the sample is guided towards a detector;

wherein the first optical element has a different optical imaging property than the second optical element; and

further wherein the second optical element comprises a ring lens.

19. A microscope objective system comprising:

an objective, comprising a first optical element defining an illumination beam path via which illumination radiation from a source is directed onto a sample to be examined; and

a second optical element surrounding at least part of the first optical element and defining a partial detection beam path and, which together with the first optical element defines a detection beam path via which radiation to be detected and coming from the sample is guided towards a detector;

wherein the first optical element has a different optical imaging property than the second optical element; and

further wherein the first optical element comprises a substantially plane-parallel plate.