The influence of the Q-switched and free-running Er:YAG laser beam characteristics on the ablation of root canal dentine

Papagiakoumou, Eirini; Papadopoulos, Dimitrios; Khabbaz, Marouan G.; Makropoulou, M.; Serafetinides, A. A.

doi:10.1016/j.apsusc.2004.03.221

Cited by 13 publications

(7 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The laser pulse parameters usually taken into account are wavelength, pulse energy or fluence, pulse duration and repetition rate. However, latest works are oriented to the study of the influence of temporal profile of the laser pulse on the ablation process 14 and to the experimental study of the morphological aspects of the produced crater due to beam profile energy distribution abnormalities 15 . Especially, the laser beam quality delivered to the biological tissue may affect the crater, influencing both its shape and morphology.…”

Section: Introductionmentioning

confidence: 99%

Dentin mid-infrared laser ablation at various lasing parameters

et al. 2005

View full text Add to dashboard Cite

In this study a frustrated total internal reflection (FTIR) Q-switched and free-running Er:YAG laser, as well as a novel design transversally excited atmospheric pressure (TEA) oscillator-double amplifier corona preionised high beam quality Hydrogen-Fluoride (HF) laser system, all developed in our lab, were used in dentin ablation experiments. In the case of the Er:YAG laser, pulses of 190 ns in Q-switched operation and of 80 µs pulse width in free-running operation at 2.94 µm were used, while HF laser pulses of 39 ns in the wavelength range of 2.6-3.1 µm in a predominantly TEM 00 beam were also used to interact in vitro with dentin tissue. Several samples of freshly extracted human teeth were used, cut longitudinally in facets of 0.4-1.5 mm thick. Ablation experiments were conducted with the laser beam directly focused on the tissue or after being waveguided through suitable mid-IR fiber/waveguide alternatively ended with quartz endsealing caps. The correlation between the various laser beam parameters, as wavelength, pulse duration, repetition rate, energy and spatial distribution of the beam profile and the ablative characteristics (ablation rates, tissue surface morphology) of dentin surface were investigated.

show abstract

Section: Introductionmentioning

confidence: 99%

Dentin mid-infrared laser ablation at various lasing parameters

et al. 2005

View full text Add to dashboard Cite

show abstract

“…In the last decades, a considerable interest in the mid-infrared Er:YAG laser microsurgery has been observed especially after the development of optical fibers and waveguides for safe and efficient transmission of the ~3.0 m wavelength beams [7][8][9][10]. This interest is based on the fact that the Er:YAG laser radiation wavelength of 2.94 m corresponds to a very strong absorption peak of both soft and hard biological tissues that contain a significant amount of water and/or hydroxyapatite [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Micromanipulation of cells and microparticles using optical fibers

Kotsifaki

Makropoulou

Serafetinides

2011

Medical Laser Applications and Laser-Tissue Interactions V

View full text Add to dashboard Cite

Optical tweezers is a powerful tool which is used to capture and manipulate microscopic particles such as dielectric microspheres and cells. In the single optical trap the beam is strongly focused to a diffraction limited spot by a high numerical aperture objective. Resently a new version of optical trap was demonstrated with optical fibers. Compared with the common optical tweezers which required high power microscope objective and carefully adjusted optical path, the fiber optical tweezers are compact in size and less expensive. Moreover, they have also a working distance not necessarily close to the objective as for a typical optical tweezers.In this work we present the development of a single beam optical fiber trapping system integrated with an optical fiber ablation system for micromanipulation of biological objects. The fiber trap was formed using a continuous wave He-Ne laser operating at 632.8 nm. The fiber ablation system was formed using a free-running Er:YAG laser operating at 2.94 m with pulse duration of 80 m. The ablation beam was coupled into the front end of a fluoride glass optical fiber via a focusing lens of 100 mm and a pinhole of 50 m. We evaluated the fluoride glass optical fiber as far as attenuation and as far as the spatial distribution of the energy output is concerned. We verified that optical trapping and the micromanipulation of micro objects were easily achieved, by a focused laser beam, emerging from optical fiber inclined at 42 degrees to the sample.

show abstract

“…It is very important however to be able to remove specific layer of material while preserving adjacent ones. It requires in turn careful choice of laser radiation parameters such as fluency and interaction duration.According to few publications and own experience, microsecond laser pulses seem to meet these requirements [1,2].In the present paper, a setup of Nd: Y AG laser operated at 1.32 11m with intracavity second harmonic generation is presented. In the overcoupled regime [3] at the output, the laser allowed to achieve red pulses at wavelength of 0.66 11m with variable duration ranging from several hundred nanoseconds to about 3 microseconds.…”

mentioning

confidence: 98%

“…According to few publications and own experience, microsecond laser pulses seem to meet these requirements [1,2].…”

mentioning

confidence: 99%

Microsecond red laser pulses via overcoupled intracavity second harmonic generation

Ostrowski

2011

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)

View full text Add to dashboard Cite

Due to their advantages, solid-state lasers are widely used in a number of material processing technological processes. In addition, such features as non-invasive, selective, self-limiting and precise interaction contribute to many laser applications in medicine (surgery, ophthalmology, dermatology and dentistry) and art-work conservation. It is very important however to be able to remove specific layer of material while preserving adjacent ones. It requires in turn careful choice of laser radiation parameters such as fluency and interaction duration.According to few publications and own experience, microsecond laser pulses seem to meet these requirements [1,2].In the present paper, a setup of Nd: Y AG laser operated at 1.32 11m with intracavity second harmonic generation is presented. In the overcoupled regime [3] at the output, the laser allowed to achieve red pulses at wavelength of 0.66 11m with variable duration ranging from several hundred nanoseconds to about 3 microseconds. The optical scheme of the laser is shown in Fig. 1.

show abstract

The influence of the Q-switched and free-running Er:YAG laser beam characteristics on the ablation of root canal dentine

Cited by 13 publications

References 36 publications

Dentin mid-infrared laser ablation at various lasing parameters

Dentin mid-infrared laser ablation at various lasing parameters

Micromanipulation of cells and microparticles using optical fibers

Microsecond red laser pulses via overcoupled intracavity second harmonic generation

Contact Info

Product

Resources

About