Topic
Ruby laser
About: Ruby laser is a research topic. Over the lifetime, 2474 publications have been published within this topic receiving 38933 citations. The topic is also known as: corundum laser & ruby rod.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the S 1 → S 0 fluorescence spectrum, between 740 and 940 nm, of azulene solutions (10 −3 M in methanol) excited with a Q-switched ruby laser was presented.
20 citations
TL;DR: In this paper, the authors compare the histo-pathology and electron microscopy of short and long term retinal scars produced by both quasi-continuous ruby laser and short pulse xenon arc exposures.
Abstract: The problem of hypercoagulation and the occurrence of post-coagulative maculopathy have long been associated with xenon arc photocoagulation procedures. The virtual absence of these complications with pulsed ruby laser coagulations has led many workers to experiment with short pulse exposure techniques. We describe and compare the histo-pathology and electron microscopy of short and long term retinal scars produced by both quasi-continuous ruby laser and short pulse xenon arc exposures. Our results show, that both systems produce damage only in the outer retinal layer, and result in very similar scar formations, with no involvement of the inner plexiform or nerve fibre layers.
20 citations
TL;DR: In this article, self-focusing of ruby laser light is studied as a function of sample length and temperature in the isotropic phase of nematic liquid-crystal MBBA.
Abstract: Self‐focusing of ruby laser light is studied as a function of sample length and temperature in the isotropic phase of nematic liquid‐crystal MBBA. The critical power for self‐focusing, 0.36 kW, observed near the phase transition temperature is a factor of 20 times less than that for CS2. The corresponding nonlinear index 4.4 × 10−10 esu is the largest value known so far for any material.
20 citations
TL;DR: In this article, it was shown that there is a correspondence between the near field distribution of light from a ruby laser and its interferogram, and that filaments occur in ruby lasers but are not present for good quality crystals.
Abstract: It is shown, theoretically and experimentally, that there is a correspondence between the near field distribution of light from a ruby laser and its interferogram. Specifically, it is shown that, in general, filaments occur in ruby lasers but that these are not present for good quality crystals. An interferometric method for assessing crystal quality is described. The results of preliminary investigations of the spatial distribution of coherence in the near field of a good laser are given, and it is shown that there is a high degree of coherence between points separated by as much as 3.2 mm on the face of a ruby laser.
20 citations
TL;DR: The principle of operation, construction, and performance of a compact waveguide dye laser, especially designed as a source of retinal photocoagulators, are described, and the guiding effects produced by the thermal gradients induced by the pumping pulse and the use of closed resonator make the laser very reliable, simple, and with good pulse repeatibility.
Abstract: The principle of operation, construction, and performance of a compact waveguide dye laser, especially designed as a source of retinal photocoagulators, are described, The guiding effects produced by the thermal gradients induced by the pumping pulse and the use of closed resonator make the laser very reliable, simple, and with good pulse repeatibility. The construction is very simple and inexpensive. Except for flashlamps, which are commercial, no part of the laser requires sophisticated technology to be built or assembled; neither optical components have critical flatness and need careful alignment. The system does not need cooling, and slow recirculation of the solution, necessary to replace the degraded dye in the waveguide, is provided by a magnetically coupled 0.1 W electric motor. The dye cell, pump, and dye reservoir form a single component of the laser which can be easily extracted for inspection and replacement of the dye solution. The single, regular pulse emitted by the laser, its time duration (a few microseconds), the possibility to operate the laser at the absorption peaks of the ocular tissues make the laser better than the random spiking ’’passive’’ ruby laser or than the ’’explosive’’ Q−switched ruby laser for ophthalmological applications. If connected with a slit lamp, the laser should compete with the much more expensive ion gas lasers. Good retinal photocoagulations have been made in rabbits using a solution of Rhodamine 6G in ethanol. Retinal spots of rectangular shape of variable dimension but of constant energy density have veen produced by simply masking the exit window of the laser.
20 citations