BACKGROUND Using the concept of selective photothermolysis, a variety of laser systems have been developed to remove unwanted hair. OBJECTIVE To evaluate the relative efficacy, tolerability, and subject satisfaction of three different laser systems used individually and in rotation for axillary hair removal. METHODS Twenty female patients (17 with dark-colored hair, 3 with red or light-colo...

In recent studies, an optically pumped Ar*/He laser has been demonstrated using the Ar 4p[1/2]1→4s[3/2]2 transition at 912.55 nm. Time-resolved data for this system, recorded using CW laser excitation and pulsed discharge production of Ar* 4p[3/2]2, yielded laser output pulses that were of unexpectedly short duration. It was speculated that radiative relaxation from the upper laser level to the...

Previously published Photo Quizzes are now featured in a mobile app. Get more information at http:// www.aafp.org/afp/apps. A 14-year-old boy presented with a tender red papule on his finger. He first noticed it two months earlier. It bled several times, especially when rubbed by his baseball mitt. He had no medical problems or allergies, and he was not taking any medications. He had no other s...

We investigate theoretically the high-order harmonic spectrum extension and numerical generation of an intense isolated attosecond pulse from He+ ion irradiated by a two-color laser field. Our simulation results show that the chirp of the fundamental field can control HHG cutoff position. Also, these results show that the envelope forms of two fields are important factors for controlling the re...

By RICHARD I. WALKER, J. C. HERIOX AND S. \V. SMITH, Jn. A N UNEXPECTED INCREASE in resistance to osmotic lysis of red cells passed through cotton has been observed many times in this laboratory during procedures for obtaining samples of pure lymphocytes for chemical analysis1 and in vitro culture.2 This increased resistance has been manifest by incomplete lysis on exposure to hypotonic solutio...

Resonance transition rubidium laser (5P1/2→5S1/2) is demonstrated with a hydrocarbon-free buffer gas. Prior demonstrations of alkali resonance transition lasers have used ethane as either the buffer gas or a buffer gas component to promote rapid fine-structure mixing. However, our experience suggests that the alkali vapor reacts with the ethane producing carbon as one of the reaction products. ...

Second harmonic generation (SHG) obtained using a potassium dihydrogen phosphate (KDP) nonlinear crystal from a CW He–Ne laser as a pump source, which emits at 632.8 nm, is reported. The SHG efficiency at the power of the He–Ne laser utilized (18 mW) and the fundamental beam waist available (0.1 mm), was evaluated theoretically; the same efficiency was measured experimentally obtaining a value ...