Diffraction-limited achromatic beam expanding telescope
US4461546A · kind A · utility
5Cited by
1References
12Claims
0Family size
Inventors
Key dates
| Filing date | Jun 24, 1982 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Jun 24, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser beam expander provides usable optical performance from 1800A to 12,000A and nearly diffraction-limited optical performance over a spectral range of 2400A to 11,000A without focus adjustment, and with a beam expansion ratio of 20 to 1. Four air-spaced all-spherical-surface lenses are arranged in two pairs in Galilean telescope type series. The first three lenses are biconcave and of fused silica and the fourth lens is biconvex and of calcium fluoride. Working and mounting tolerances are conventional.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.