Showing papers by "Martin M. Fejer published in 1984"
TL;DR: In this article, a single-crystal fiber growth apparatus was designed and built using optical, mechanical, and electronic control systems that enable the growth of high optical quality singlecrystal fibers.
Abstract: We have designed and built a single‐crystal fiber growth apparatus. The apparatus employs novel optical, mechanical, and electronic control systems that enable the growth of high optical quality single‐crystal fibers. We have grown oriented single‐crystal fibers of four refractory oxide materials, Al2O3, Cr:Al2O3, Nd:YAG, and LiNbO3. These materials exhibit similar growth characteristics and yield fibers of comparable quality. Fibers as small as 20 μm in diameter and as long as 20 cm have been grown. Measured optical losses at 1.06 μm for a 10‐cm‐long, 170‐μm‐diam Cr:Al2O3 fiber were 0.074 dB/cm.
220 citations
Patent•
07 Sep 1984TL;DR: In this article, the diameter of a fiber is determined by directing a laser beam transversely onto the fiber and directing a fringe produced by the scattering of the beam to a photodiode array by means of a transforming lens.
Abstract: Changes in the diameter of a fiber are determined by directing a laser beam transversely onto the fiber and directing a fringe produced by the scattering of the beam to a photodiode array by means of a transforming lens. Circuitry is provided to detect movement of the fringe on the diode array thereby indicating changes in the diameter of the crystal fiber.
10 citations
26 Sep 1984
TL;DR: In this article, single crystal fibers of four refractory oxide materials (Ae20 3, Cr:AZ 2 0 3, Nd:YAG and LiNb03) have been grown by a miniature pedestal growth technique.
Abstract: Single crystal fibers of four refractory oxide materials (Ae20 3 , Cr:AZ 2 0 3 , Nd:YAG and LiNb03) have been grown by a miniature pedestal growth technique. The growth apparatus employs novel electronic control, mechanical and optical systems enabling growth of high optical quality fibers. All four materials exhibit similar growth characteristics and yield fibers of comparable quality. Measured optical waveguide losses at 632.8 nm for a 5 cm long 170 μm diameter CreAZ 2 0 3 fiber were 0.04 dB/cm.
5 citations
Patent•
31 Aug 1984TL;DR: In this article, a resilient belt which receives a crystal fiber in pressure engagement is used to translate a translation apparatus for crystal fiber, where the fiber is supported by a support member having a grooved surface for receiving the fiber.
Abstract: Translation apparatus for a crystal fiber includes a resilient belt which receives a crystal fiber in pressure engagement. The fiber is supported against the belt by a support member having a grooved surface for receiving the fiber. A floating block is positioned within a loop of the belt and is offset in the loop when the support member and fiber are brought into engagement with the belt.
4 citations
19 Jun 1984
TL;DR: In this article, a fiber growth apparatus was designed and built to produce high-optical-quality single-crystal fibers using the laser heated miniature pedestal growth technique and employs novel electronic control, mechanical, and optical systems.
Abstract: We have designed and built a fiber growth apparatus to produce high-optical-quality single-crystal fibers. The growth apparatus uses the laser heated miniature pedestal growth technique and employs novel electronic control, mechanical, and optical systems. Figure 1 schematically illustrates miniature pedestal growth of a single-crystal fiber. A CO2 laser, emitting 10.6-μm radiation, provides a controlled tightly focusable heat source to melt the refractory material. In our apparatus the optical system focuses the laser beam onto the fiber in a 380° axially symmetric distribution as shown in Fig. 2. This symmetric irradiance prevents cold spots in the growth zone. Growth proceeds by simultaneous upward translation of the seed and source rods with a molten zone positioned between them.