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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 5087108 | Double-core active-fiber optical amplifier having a wide-band signal wavelength The invention relates to an optical amplifier, in particular for optical fiber telecommunication lines (1), operating with a transmission signal in a predetermined wavelength range, which amplifier comprises a fluorescent active optical fiber (6) doped wi... | 02/11/1992 |
| 5048026 | Fiber optic amplifier A side pumped, fiber optic amplifier comprises an optical fiber, having a first refractive index, formed of a laser material, such as Nd:YAG. A jacket, which surrounds the optical fiber, has a second refractive index, lower than the first refractive index... | 09/10/1991 |
| 5005175 | Erbium-doped fiber amplifier This invention is a rare earth doped optical amplifier with increased gain and lowered pump thresholds. The amplifying scheme is based on a 3 level lasing system rather than the more prevalent 4 level lasing system. Additionally, the transmission mode of ... | 04/02/1991 |
| 4962995 | Glasses for high efficiency erbium (3+) optical fiber lasers, amplifiers, and superluminescent sources Glass compositions for high efficiency erbium3+ -doped optical fiber lasers, amplifiers and superluminescent sources are optimized for pumping by high power solid state lasers in the vicinity of 800 nm to provide amplified signals in wavelength... | 10/16/1990 |
| 4859016 | Fiber optic amplifier An amplifier for use with fiber optic systems comprises a neodymium YAG crystal placed in series with a signal-carrying optical fiber. The ND:YAG crystal is supplied by the optical fiber with both the signal to be amplified, and pumping illumination. The ... | 08/22/1989 |
| 4720684 | Optical amplifier Use is made of stimulated Raman emission to induce gain in an optical signal (13) of a first wavelength. The optical signal (13) and a pump signal (14) are synchronously coupled to a length of optical fibre (15). The pump signal is at a second wavelength.... | 01/19/1988 |
| 4015217 | Means for producing and amplifying optical energy A laserable material with a host of non-gaseous, non-periodic atomic structure is provided. The host material is plastic and dispersed in solid solution within the plastic is a chelate of a rate earth metal. The material exhibits narrow-line fluorescence ... | 03/29/1977 |
| 4001704 | Laser solar cell apparatus A highly doped optical amplifier in the form of a thin layer or fiber wherein the pump light is directed transversely to the surface of the layer or fiber. A transparent substrate is provided underneath the layer or fiber and a solar cell is provided in l... | 01/04/1977 |
