Reflective beam splitting objective
US4653880A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1985 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Mar 1, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A reflecting beam splitting objective employing only three mirrors obtains a high reflective efficiency. In one embodiment, the objective contains a small intercepting mirror between primary and secondary mirrors of a Cassegrain mirror arrangement. The position of the intercepting mirror is determined so that the mirror receives an input beam and directs that beam onto a first portion of the secondary mirror without vignetting the beam when it is reflected from the secondary mirror to a first portion of the primary mirror or by cutting off part of the image transmitted from the second portion of the secondary mirror to a focus behind the primary mirror. The objective may use all energy that is input into the objective to image a sample. The objective has demonstrated particular utility in the field of infrared spectroscopy of small samples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.