Loss factors in optical fibres

Yoshida, Kazuo; Furui, Yasuro; Sentsui, S.; Kuroha, Toshiaki

doi:10.1007/bf00620033

Cited by 20 publications

(4 citation statements)

References 7 publications

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“…It is accepted that fiber construction may be of differing quality or purity [ 51 ] and some literature sources do allude to possible power losses along delivery fibers in a range of 5% to 20% [ 52 ]. Additional data show that there is a wide variation in the range of transmission for different infrared fibers, and that the loss in most of those fibers is quite high compared with silica fibers [ 53 ].…”

Section: Discussionmentioning

confidence: 99%

Do Lasers Have an Adjunctive Role in Initial Non-Surgical Periodontal Therapy? A Systematic Review

et al. 2020

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(1) Background: dental lasers have numerous applications for periodontal therapy which include surgical procedures of soft tissue and osseous structures, and non-surgical treatments such as pathogen reduction, removal of surface accretions, and photobiomodulation. The aim of this review was to evaluate the scientific literature to ascertain whether lasers have a beneficial role when used adjunctively in initial non-surgical periodontal therapy. (2) Methods: A PubMed search was performed specifically for randomized clinical trials where a dental laser was used adjunctively for initial periodontal therapy on human patients published from January 2010–April 2020. The first search identified 1294 eligible studies. After additional criteria and filters were applied, 20 manuscripts were included in this review. (3) Results: The chosen manuscripts reported on investigations into initial therapy for patients diagnosed with chronic periodontitis. After periodontal charting, conventional instrumentation such as hand and ultrasonic scaling was performed on all patients in the studies, and then a test group or groups of patients were treated adjunctively with a laser. That adjunctive laser group’s periodontal findings showed various degrees of improved health compared to the group treated with only conventional methods. (4) Conclusion: This systematic review found that 70% of the included studies reported significantly better outcomes in certain clinical parameters, but no improvement in others. The remaining 30% of the manuscripts reported no significant difference in any of the measurements. With consideration to correct parametry, lasers have an adjunctive role in initial non-surgical periodontal therapy.

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Section: Discussionmentioning

confidence: 99%

Do Lasers Have an Adjunctive Role in Initial Non-Surgical Periodontal Therapy? A Systematic Review

et al. 2020

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“…Ignoring defects and UV absorption tails, the final attenuation limit can be clarified. According to 11 , the spectral dependence of the Rayleigh scattering can be described by…”

Section: Transmission Spectrum Of Pure Silica Core "Standard" Fibermentioning

confidence: 99%

<title>Transmission behavior of silica core: fluorine-doped cladding fibers in the visible and ultraviolet region</title>

Unger¹,

Kirchhof²,

Schroeter³

et al. 2002

Optical Fibers and Sensors for Medical Applications II

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Pure silica core fibers with a high OH content are believed to be the best fiber type for the visible and ultaviolet region concerning low attenuation and high power stability. Here we present systematic investigations of silica core -fluorine doped cladding fibers made by MCVD, where the composition of the fiber core was slightly modified by doping with germanium, phosphorus, boron, aluminium, and fluorine at a low level of typically 0.5 mol%. Moreover, the influence of hydrogen treatment was studied. The attenuation level in the visible region, the defect band at 330 nm and the oxygen deficiency bands around 250 nm could be correlated with the preform modifications in a systematic manner. Interaction mechanisms between the defect bands and with the OH groups are discussed. The stability of the fiber against high power blue light in the Watt range was investigated. By suitably modified fibers, stability times could be realized much longer than in conventional high OH fibers.

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“…S.B.exp ( -hcv /kT).exp ( -2ytz) (6) with E4= }5nJ, v = 2x108ms -1, a s = 4x10 -6m 1 into the spectrometer bandpass, B = 0.01 andv = 4x10 4 m -1 . This gives PAS = 5W at room temperature from the near end of the fibre.…”

Section: Avalanche Photodiode Detectionmentioning

confidence: 99%