Theoretical and experimental investigations of multiple transverse mode laser oscillation involving spatially varying gain and loss are carried out. The effect of gain and loss distribution on mode competition is analyzed. Numerical examples are given for a CO2 waveguide laser array. Experimental results of CO2 laser arrays are found to be consistent with the theory, and robust in-phase coupled...

BACKGROUND Several high-energy, pulsed and scanned carbon dioxide (CO2) lasers are currently available for cutaneous resurfacing. Although each laser system adheres to the same basic principles of selective photothermolysis, there are significant differences between lasers with respect to tissue dwell time, energy output, and laser beam profile. These differences may result in variable clinical...

INTRODUCTION The aim of this study was to investigate the morphological changes of human dentin after Erbium-Doped Yttrium Aluminum Garnet (Er:YAG), Carbon Dioxide(CO2) laser-irradiation and acid-etching by means of scanning electron microscopic (SEM) Methods: 9 extracted human third molars were used in this study. The teeth were divided in three groups: first group, CO2 laser with power of 1.5...

We discuss the spectroscopic requirements for a laser absorption spectrometer (LAS) approach to high-precision carbon dioxide (CO2) measurements in the troposphere. Global-scale, high-precision CO2 measurements are highly desirable in an effort to improve understanding and quantification of the CO2 sources and sinks and their impact on global climate. We present differential absorption sounding...

objectives this study aimed to evaluate the efficacy of afcl in improvement of hand photoaging in 25 patients. patients and methods a prospective, before- after, single blind study was conducted in 25 patients who presented for desired treatment of hand photoaging. patients received three treatments sessions with afcl. results all enrolled patients were female and received three treatment sessi...

OBJECTIVES This study aimed to assess the effect of the Microablative Fractional CO2 Laser (CO2-laser) therapy on vaginal pathophysiology and the symptoms of the Genitourinary Syndrome of Menopause (GSM). METHODS Postmenopausal women with moderate to severe symptoms of GSM underwent three sessions of CO2-laser therapy at monthly intervals. Participants were evaluated at baseline and 4 weeks a...

The CO2 laser surgery represents a treatment method of laryngeal bicordal and anterior commissure glottic cancer T1b, T2, N0. In Department of ENT, Timisoara, Romania, during 1.01.2001-31.12.2011 were analyzed 781 files from patients with laryngeal neoplasm. One hundred twenty-seven patients presented the tumor that involved both vocal cords and anterior commissure, stages T1b, T2 and T3. Thera...

We introduce a programmable electronic circuit implementing the rich dynamics of CO2 laser models. The design and the implementation of the circuit are accomplished by using a programmable analog device, which permits an experimental characterization of the laser dynamics. The experimental results shown in the paper demonstrate that the circuit exhibits homoclinic chaos typical of CO2 laser wit...

of this study was to analyze the effects of carbon dioxide (CO2) laser light on the structure and elemental composition of dentine. METHODS The evaluation was conducted on samples from extracted teeth. The surface of the dentine was exposed to the radiation from a CTL 1401 CO2 laser (Centre of Laser Technology, Poland). The radiation and frequency parameters were as follows: group I with 5 W ...

Objectives: We evaluated the efficacy of CO2 laser myringotomy combined with adenoidectomy in children with serous otitis media (SOM) unresponsive to medical therapy and compared the recurrences in the follow-up period with the control group who underwent adenoidectomy and ventilation tube (VT) insertion. Patients and Methods: The CO2 laser myringotomy group included 25 children with a mean age...