Laser apparatus for surgery and force therapy based on high-power semiconductor and fibre lasers

Минаев, В. П.

doi:10.1070/qe2005v035n11abeh006616

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…IR diode lasers with other wavelengths of generation (λ 1 gen = 1.56 µm and λ 2 gen = 0.97 µm) are also used [7]. Water is the main factor of absorption of cartilaginous tis sue in the near IR region.…”

Section: Specific Features Of Laser Surgery Of Cartilaginous Tissue Imentioning

confidence: 99%

Organic dyes in laser surgery of cartilaginous tissues

et al. 2007

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IntroductionOptical surgical technologies were extensively devel oped in the 1990s. This gave rise to laser scalpels, which are common and effective surgical instruments in modern medical centers. Tissue dissection with a laser beam is accompanied by blood coagulation at the incision site. This reduces blood losses and facilitates surgery of such blood filled organs as liver and pancreas. The use of laser scalpels reduces the time of dry field surgery, pain reac tions to surgery, and postsurgical edema. In addition, remote laser surgery and surgery using lightguide disin fects the surgical wound.Flexible fiber optic lightguides are able to transfer optical radiation virtually without losses. This made the laser scalpel an ideal instrument for laparoscopic surgery. Special puncture operations were developed in which the lightguide is applied to the pathological lesion through a thin injection needle.Lack of methods for control of the laser beam direc tion gives rise to undesirable damage to adjacent tissues. Local staining (sensitization) of the treatment zone with laser radiation absorbers provides a solution to this prob lem. The laser radiation absorbers are organic dyes. The dyes have already been used for amplification of laser radiation during welding of small blood vessels and frag ments of human organs, as well as for healing of wound surface. Radiation induced heating causes disruption of cell membranes. The dye contained in cells forms strong intercellular bonds mediated by intermolecular bonds. Similar processes are observed during laser induced ther moplasty of cartilaginous tissues.Simultaneous effects of laser induced heating and heat transfer from adjacent tissues determine the temper ature and area of heated site.The use of organic dyes in laser surgery of cartilagi nous tissues in practical medicine requires solution of a number of theoretical and practical problems of biomed ical optics, laser engineering, and organic chemistry. Use of Organic Dyes in Laser SurgeryNew methods of laser surgery include methods based on injection (application) of organic dyes to biological tissues. Virtually harmless organic dyes, such as indo cyanin green (ICG, cardiogreen), are incorporated in laser solders used for soldering fine fibers of the human body (nerves, small blood vessels, sperm ducts, etc.) [8].The use of ICG for high contrast medical imaging is promising because the spectrum of the dye contains an intense band in the IR range, where intrinsic absorption of biological tissue is small. Suitable IR diode lasers are available. The toxicity of ICG is low, and this dye is easi ly excreted from human body. The dye is adopted for medical use.The spectral absorption maximum of ICG solution λ abs max in water and bovine blood plasma is at 779 and 803 nm, respectively. The bandwidth of the spectral band is ∆λ ≈ 60 nm; extinction coefficient, ε max ≈ 2⋅10 5 liter/ mol⋅cm. Spectral fluorescence maximum of ICG solution λ fl max in water and bovine blood plasma is at 810 and 829 nm, respectively; the luminescence q...

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Section: Specific Features Of Laser Surgery Of Cartilaginous Tissue Imentioning

confidence: 99%

Organic dyes in laser surgery of cartilaginous tissues

et al. 2007

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“…In recent years, pulsed green lasers have attracted much attention because of their broad application prospects in clinical medicine, ion spectroscopy, pollution detection, 3D laser scanning, and other fields [1][2][3][4]. Currently, there are two most convenient methods to get a high-quality pulsed green light source.…”

Section: Introductionmentioning

confidence: 99%

>10 kW peak power self-frequency doubling laser

Zhao¹,

Yu²,

Wang³

et al. 2023

Laser Phys. Lett.

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A passively Q-switched self-frequency doubling (SFD) green laser based on quasi-continuous diode-pumped and Nd:Ca3TaGa3Si2O14 crystal was developed for the first time with Cr4+:Y3Al5O12 as the saturation absorber. The output wavelength was 533 nm and the maximum average output power was 57 mW, corresponding to single pulse energy, pulse duration, and peak power of 190 μJ, 14.35 ns, and 13.24 kW, respectively. To our knowledge, this is the best result of diode-pumped, pulsed SFD lasers to date. Its compact components and low cost provide a better way to obtain an all-solid-state, miniaturized green laser with high peak power.

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“…Pulsed fiber lasers have emerged as essential optical light sources for a wide variety of photonic applications [1][2][3][4][5]. For applications involving short or ultrashort pulse generation, mode locking is the preferred technique, whereas for applications that comprise relatively long and highly energetic optical pulses, Q-switching is the most suitable technique.…”

Section: Introductionmentioning

confidence: 99%

Q-switching and mode locking pulse generation from an all-fiber ring laser by intermodal acousto-optic bandpass modulation

et al. 2018

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Q-switched and mode-locked (QML) pulse generation from an all-fiber ring laser based on intermodal acousto-optic bandpass modulation is reported. The modulator relies on full-acoustooptic mode re-coupling cycle induced by a standing flexural acoustic wave, with a transmission response that is controlled by amplitude modulation of the acoustic wave signal. The Q factor of the cavity is controlled by a rectangular pulse wave with variable frequency and duty cycle, whereas mode locking is achieved by amplitude modulation derived from a standing flexural acoustic wave. The best QML pulses were obtained at 0.5 kHz repetition rate, with a pump power of 549.2 mW, at the optical wavelength of 1568.2 nm. A maximum overall energy of 2.14 J at an average output power of 1.07 mW was achieved, corresponding to a burst of mode-locked sub-pulses of 100 ps pulse duration within a QML envelope of 3.5 s.

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Laser apparatus for surgery and force therapy based on high-power semiconductor and fibre lasers

Cited by 9 publications

References 3 publications

Organic dyes in laser surgery of cartilaginous tissues

Organic dyes in laser surgery of cartilaginous tissues

>10 kW peak power self-frequency doubling laser

Q-switching and mode locking pulse generation from an all-fiber ring laser by intermodal acousto-optic bandpass modulation

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