BACKGROUND The comparatively evaluate the three surgical treatment modalities namely cryosurgery, diode and CO2 laser surgery in terms of healing outcomes on the day of surgery, first and second week post operatively and recurrence at the end of 18 months was assessed. MATERIAL AND METHODS Thirty selected patients were divided randomly into three groups. Each group comprising of ten patients ...

We demonstrate an all optical waveguide imprinted by a low power Laguerre Gaussian control laser beam using a coherent Raman process in warm atomic rubidium vapor. We show that the signal beam propagates with a small spot size over several diffraction lengths. We also show that the coupling efficiency of the signal beam into the waveguide varies linearly with the signal power.

A 1542-nm planar-waveguide external cavity laser (PW-ECL) is shown to have a sufficiently low level of noise to be suitable for precision measurement applications. Its frequency noise and intensity noise was comparable or better than the non-planar ring oscillator (NPRO) and fiber laser between 0.1 mHz to 100 kHz. Controllability of the PW-ECL was demonstrated by stabilizing its frequency to ac...

introduction: although dental caries is a preventable disease, it is still common and remains a public health problem. one of the potentially effective preventive measures is the use of lasers. the purpose of this study was to review the studies about use of laser irradiation on the inhibition of carious lesions and the effectiveness of different commercial laser type (nd:yag, co2, and argon). ...

BACKGROUND Although clinical melanin pigmentation does not present itself as a medical problem or a disease entity, "black gums" is a major esthetic complaint for many people, who often requests cosmetic corrections. Gingival depigmentation can be carried out using many procedures; lasers of various types being a new addition. This study was undertaken to evaluate and compare the effectiveness ...

OBJECTIVE To compare the histologic appearance of canine skin biopsies collected by use of a scalpel, skin biopsy punch, monopolar electrosurgery, CO2 laser, and radio wave radiosurgery in fully rectified wave form (RWRS). STUDY DESIGN Experimental, randomized design. ANIMALS Healthy adult grayhounds (n=4). METHODS Skin biopsies were collected using 5 techniques. Cut margins of biopsy spe...

OBJECTIVES Fluoride therapy is important for control and prevention of dental caries. Laser irradiation can increase fluoride uptake especially when combined with topical fluoride application. The objective of this study was to compare the effects of CO2 and diode lasers on enamel fluoride uptake in primary teeth. MATERIALS AND METHODS Forty human primary molars were randomly assigned to four...

We review our recent work on the various nonlinear optical processes that occur as an intense laser propagates through a relativistic plasma. These include the experimental observations of electron acceleration driven by laser-wakefield generation, relativistic self-focusing, waveguide formation and laser self-channeling.

We report quasi-phase-matched difference-frequency generation of 2.1 pm radiation at room temperature using the & nonlinear coefficient in a periodically poled lithium niobate channel waveguide. A tunable Ti:A1203 laser (ilzO.8 ,um) and a Nd:YAG laser (I = 1.32 pm) were the pump and signal sources, respectively. With 160 mW of 0.81 pm and 1 mW of 1.32 pm radiation coupled into the waveguide, 1....