Scanning microscope

1. A scanning microscope comprising:

a laser configured to emit laser light;

an objective configured to focus the laser light on an object;

a scanner configured to scan the object in a direction orthogonal to an optical axis of the objective;

a varifocal lens configured to scan the object in an optical-axis direction of the objective by changing a lens shape of the varifocal lens;

a first relay lens;

a second relay lens;

a photodetector configured to detect fluorescence generated from the object upon the laser light being focused on the object by the objective; and

a dichroic mirror configured to separate the fluorescence and the laser light emitted from the laser from each other,

wherein:

the varifocal lens is located at a position optically conjugate to a pupil of the objective and between the objective and the scanner,

the first relay lens is located between the scanner and the varifocal lens, and

the second relay lens is located between the pupil of the objective and the varifocal lens.

2. The scanning microscope according to claim 1 , wherein the dichroic mirror is located between the varifocal lens and the laser.

3. The scanning microscope according to claim 2 , further comprising:

a confocal pinhole located at a position between the dichroic mirror and the photodetector, the position being optically conjugate to a front focal position of the objective,

wherein the dichroic mirror is located between the scanner and the laser.

4. The scanning microscope according to claim 1 , wherein:

the scanner is located at a position optically conjugate to the pupil of the objective.

5. The scanning microscope according to claim 2 , wherein:

the scanner is located at a position optically conjugate to the pupil of the objective.

6. The scanning microscope according to claim 3 , wherein:

the scanner is located at a position optically conjugate to the pupil of the objective.