Scanning microscope
View Patent ↗In a scanning microscope that impinges upon a sample with a first light pulse and a second light pulse, a dispersive medium that modifies the time offset between the first and the second light pulse is provided in the beam path of at least one of the light pulses.
1. A scanning microscope, that illuminates a sample with a first light pulse and at least with a second light pulse, comprising: a dispersive medium arranged in the beam path of at least one of the light pulses so that the at least one of the light pulses passes through the dispersive medium, wherein the dispersive medium comprises a block including a plurality of bounding surfaces, wherein at least one of the bounding surfaces reflects the at least one of the light pulses at least twice, wherein the block is rotatably mounted so as to vary an entrance angle of the at least one of the light pulses into the dispersive medium so as to adjust an optical path length of the at least one of the light pulses through the dispersive medium so as to adjust the pulse width of the at least one of the light pulses and so as to adjust a time offset between the first and second light pulses, and wherein a location and position of the dispersive medium are automatically adjustable so as to optimize or maximize a detection signal of the microscope.
2. The scanning microscope as defined in claim 1 , further comprising:
a light source that generates the first and the second light pulse.
3. The scanning microscope as defined in claim 2 , wherein the light source generates the first and the second light pulse by beam splitting from a primary light pulse.
4. The scanning microscope as defined in claim 2 , wherein the light source generates first and second light pulses repetitively.
5. The scanning microscope as defined in claim 2 , wherein the light source comprises at least one laser.
6. The scanning microscope as defined in claim 2 , wherein the light source comprises at least one photonic fiber and/or photonic band gap material and/or an OPO.
7. The scanning microscope as defined in claim 2 , wherein the light source comprises several individual light sources synchronized with one another.
8. The scanning microscope as defined in claim 1 , wherein the bounding surfaces are at least partially mirror-coated.
9. The scanning microscope as defined in claim 1 , wherein the angles between the bounding surfaces are selected in such a way that the bounding surfaces totally reflect the light pulses.
10. The scanning microscope as defined in claim 1 , wherein the dispersive medium has a different dispersion for the first light pulse and for the second light pulse.
11. The scanning microscope as defined in claim 1 , wherein the dispersive medium has, for the first and/or for the second light pulse, a group velocity dispersion that differs from zero.
12. The scanning microscope as defined in claim 1 , wherein the scanning microscope is at least one of a STED (stimulation emission depletion) microscope and an up-conversion microscope.
13. The scanning microscope as defined in claim 1 , wherein the scanning microscope is at least one of a 4-Pi microscope and a CARS (coherent anti-Stokes Raman scattering) microscope.
14. The scanning microscope as defined in claim 1 , wherein the block includes glass.