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At first glance, the amount of water molecules naturally contained in humid air is negligibly small to affect filamentation of ultrashort laser pulses. However, here we show, both experimentally and numerically, that for ultraviolet laser pulses with 248 nm wavelength this is not true. We demonstrate that with increase of air humidity the plasma channels generated by the ultraviolet laser pulses in air become longer and wider, while the corresponding electron density in humid air can be up to one order of magnitude higher compared to dry air.
This article was published in the following journal.
Name: Optics letters
We realize mirror templates on the tips of optical fibers using a single-shot laser ablation procedure and perform a systematic study of the influence of the pulse power, pulse duration, and laser sp...
We experimentally demonstrate for the first time, to the best of our knowledge, a Nd-doped fiber laser with wavelength self-sweeping. The main feature of the laser is the generation of periodic micros...
Millisecond-pulse laser operation of Fe ions at 78 K is demonstrated in the ZnMnSe:Fe,Cr (x=0.3) crystal under a Tm fiber 1940 nm laser pumping through a Cr→Fe energy transfer process for the firs...
We report on silicon ablation with a 20 W GHz amplified femtosecond laser source. This novel laser delivers burst energies up to 400 μJ, providing flexible intra-pulse repetition rates of 0.88 or 3...
Long pulse 1064-nm neodymium-doped yttrium aluminum garnet (Nd:YAG) laser is a very versatile laser due to its deep penetration and absorption by hemoglobin, melanin, and, water, which has gained incr...
1. Evaluate the efficacy of the Fraxel SR laser to improve the cosmetic appearance of surgical scars, both in terms of pigmentary and textural changes. 2. Evaluate the efficacy of ...
Croup affects 5% of children under 6 years of age, resulting in visits to hospital Emergency Departments, and in 1% of children, hospitalization. Traditionally, the first therapy offered ...
To investigate the effect of pulse width on the treatment response of keloidal and hypertrophic sternotomy scars to a 595-nm pulsed dye laser
The present study has the objective of evaluating whether the previous therapy with low intensity laser, through its analgesic effect, can promote a greater comfort specifically for patien...
The goal of this study is to compare how efficient two different types of PDTs are when used in combination with topical 5-ALA. The two types of PDT lights are Blu-U light and Candela V-b...
A technique utilizing a laser coupled to a catheter which is used in the dilatation of occluded blood vessels. This includes laser thermal angioplasty where the laser energy heats up a metal tip, and direct laser angioplasty where the laser energy directly ablates the occlusion. One form of the latter approach uses an EXCIMER LASER which creates microscopically precise cuts without thermal injury. When laser angioplasty is performed in combination with balloon angioplasty it is called laser-assisted balloon angioplasty (ANGIOPLASTY, BALLOON, LASER-ASSISTED).
The use of ultraviolet electromagnetic radiation in the treatment of disease, usually of the skin. This is the part of the sun's spectrum that causes sunburn and tanning. Ultraviolet A, used in PUVA, is closer to visible light and less damaging than Ultraviolet B, which is ionizing.
Techniques using laser energy in combination with a balloon catheter to perform angioplasty. These procedures can take several forms including: 1, laser fiber delivering the energy while the inflated balloon centers the fiber and occludes the blood flow; 2, balloon angioplasty immediately following laser angioplasty; or 3, laser energy transmitted through angioplasty balloons that contain an internal fiber.
Use of a pulse of X-rays or fast electrons to generate free radicals for spectroscopic examination.
Evaluation of the contour of the PULSE waves which vary in different parts of the circulation and depend on physiological as well as pathophysiological conditions of the individual.
Blood is a specialized bodily fluid that delivers necessary substances to the body's cells (in animals) – such as nutrients and oxygen – and transports waste products away from those same cells. In vertebrates, it is composed of blo...