Showing papers on "Fiber laser published in 1973"
TL;DR: The acceptance angle of a fiber is increased remarkably by forming the fiber end spherically as discussed by the authors, and the coupling efficiency increased in this way is observed to be 5.2 times as high as that of a previous method.
Abstract: The acceptance angle of a fiber is increased remarkably by forming the fiber end spherically. It was demonstrated with light coupling into a fused‐silica‐core glass fiber from a mesa‐stripe‐geometry GaAs diode laser. The coupling efficiency increased in this way is observed to be 5.2 times as high as that of a previous method. The proper design of a fiber in this manner will lead to a light coupling efficiency higher than 90%.
131 citations
01 Dec 1973
30 citations
IBM1
TL;DR: In this paper, the four and six-wave parametric processes responsible for the conversion are initiated by stimulated electronic Raman emission, and ultrashort pulses at roughly ten different infrared wavelengths lying between ∼ 6 and 20μ are produced.
Abstract: Passage of a \sim10^{9} W/cm23470-A mode-locked laser beam through a few torr of Cs vapor results in efficient parametric conversion of pump light into beams of ultrashort pulses at wavelengths located near the ∼ 3600-A 6s-9p and ∼ 3900-A 6s-8p Cs resonance lines. In addition, ultrashort pulses at roughly ten different infrared wavelengths lying between ∼ 6 and 20μ are produced. The four- and six-wave parametric processes responsible for the conversion are initiated by stimulated electronic Raman emission.
30 citations
TL;DR: An experimental one-way 8-Mb/s 10.6-μm laser communication system that utilizes optical FM and heterodyne detection has been engineered to allow continuous operation through a variety of weather conditions.
Abstract: An experimental one-way 8-Mb/s 10.6-μm laser communication system that utilizes optical FM and heterodyne detection has been engineered to allow continuous operation through a variety of weather conditions. Performance over paths of 3 mi and 20 mi is described. Nearly 2000 h of data have been accumulated, including one continuous run of 1320 h with less than 5 percent downtime due to weather.
17 citations
TL;DR: Zory has recently repotted laser action in corrugated, leaky optical waveguides in two distinct types of modes of oscillation, which arise from the difference in the nature of the feedback mechanism.
Abstract: Zory has recently repotted laser action in corrugated, leaky optical waveguides in two distinct types of modes of oscillation. These devices belong to the class of lasers that use distributed feedback to form the resonator. In Zory's lasers, feedback is caused by diffraction from a spatially periodic modulation of the film thickness. The two modes of oscillation that he has observed arise from the difference in the nature of the feedback mechanism. The first mode type oscillates as a consequence of intramode diffraction and belongs to the set of guided modes of the leaky optical film waveguide. In contrast, intermode diffraction is the feedback mechanism in the second mode type, which belongs to a set of hybrid guided modes. The spatial beating phenomenon reported by Zory occurs only where a hybrid guided mode is oscillating in the structure. Figure 1(a) shows a cross section of a new type of corrugated laser in which we have observed laser action. It is a side-couplcd device with a passive-core thin-film waveguide supported by and adhering to a fused quartz sub-
15 citations
01 Dec 1973
TL;DR: In this paper, a stripe geometry laser with a very small lateral current spreading and a transverse single-mode oscillation was proposed, with a near-field pattern as narrow as 3 µm.
Abstract: A new type of stripe-geometry laser is proposed. A very small lateral current spreading and a transverse single-mode oscillation are realized in this structure with a near-field pattern as narrow as 3 µm.
14 citations
01 Jan 1973
4 citations
01 Apr 1973
TL;DR: In this article, the development of a special core glass for fiber optics has now made it possible to reli-ably transmit CW power densities of 5 x 104 W/cm2 and maintain output radiance of 106 W/ cm2/sr in the blue-green region of the spectrum.
Abstract: Fiber optics is known to constitute a highly desirable transmission medium for a flexible, versatile laser retinal photocoagulator system. However, it had not been possible to deliver the high average power and high radi-ance required for photocoagulation through fibers due to their inability to sustain high transmittance under intense laser radiation. The development of a special core glass for fiber optics has now made it possible to reli-ably transmit CW power densities of 5 x 104 W/cm2 and maintain output radiance of 106 W/cm2/sr in the blue-green region of the spectrum. This performance has made it possible to design a compact argon laser retinal photocoagulator system which can be coupled to a direct or indirect ophthalmoscope delivery system, or be provided with a light-weight slit lamp adaptor for use with standard slit lamp instruments. Two incidental advantages of fiber optics transmission are increased uniformity of irradiance over the exposed area in the eye, and a convergence cone angle within the eye which is virtually independent of spot size.
2 citations