18-01-2018 дата публикации
Номер: US20180017769A1
Принадлежит:
In a flow cytometer, an objective lens for focusing an input laser-radiation beam including at least four different laser-radiation wavelengths in a common plane includes only three singlet lens-elements. Two of the elements are cylindrical elements arranged as a cylindrical telescope for shaping and reducing the size of the input laser-beam. The third element is a spherical element arranged to focus the reduced size beam in the common plane. In one example, all three elements are made from the same optical material. 1. An objective lens for focusing an input beam of laser-radiation in a focal plane , comprises:first, second, and third optical elements in consecutive numerical order in a propagation direction of the beam;{'sub': 'CL1', 'the first optical element being a singlet cylindrical element having a focal length f;'}{'sub': 'CL2', 'the second optical element being a singlet cylindrical element having a focal length f;'}{'sub': 'FFL', 'the third optical element being a singlet rotationally symmetrical element having a focal length f; and'}{'sub': CL1', 'CL2', 'FFL, 'claim-text': {'br': None, 'i': f', 'f', 'G', 'f, 'sub': CL1', 'CL2', 'FFL, '−=*'}, 'wherein f, f, and fare related by an equation'}where G is between about 0.7 and about 1.4.2. The objective lens of claim 1 , wherein G is between about 0.9 and 1.1.3. The objective lens of claim 1 , wherein the third element is a spherical element.4. The objective lens of claim 1 , wherein each of the lens elements has a plane surface and a curved surface.5. The objective lens of claim 4 , wherein the curved surface of each of the optical elements is the first surface of that element in the propagation direction of the beam.6. The objective lens of claim 1 , the first claim 1 , second claim 1 , and third optical elements are made from the same material.7. The objective lens of claim 6 , wherein the optical elements are made from fused silica.8. The objective lens of claim 6 , wherein the optical elements are made ...
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