Laser- or flashlamp- (also called intense pulsed light source or IPLS) assisted hair removal is a well tolerated and effective technique for patients who desire permanent reduction of hair growth. Although laser and light sources are very popular because of their non-invasive nature and the speed at which they operate, practitioners and patients have to be cautious to avoid permanent side effec...

Background: Rosacea is a chronic inflammatory skin condition associated with four distinct subtypes: erythematotelangiectatic, papulopustular, phymatous, and ocular. Purpose: To review the different kinds of management for all subtypes. Methods: We divided rosacea management into three main categories: patient education, skin care, and pharmacological/procedural interventions. Results: Flushing...

Total internal reflecting surfaces have been proposed as regenerative structures for solid-state lasers; the laser energy is extracted from the resonator through frustrated total re­ flection by a coupling prism. Instead of using frustrated total reflection to extract the energy, we found the energy can be extracted through a hole on the tip of the total reflecting surface. In this experiment, ...

Almost 1⁄2 century ago, H. E. “Doc” Edgerton demonstrated a simple and elegant directshadowgraph technique for imaging large-scale events like explosions and gunshots. Only a retroreflective screen, flashlamp illumination, and an ordinary view camera were required. Retroreflective screens have been used for shadowgraphy in the interim, but the unique combination of large-scale, simplicity and p...

Background: Rosacea is a chronic inflammatory skin condition associated with four distinct subtypes: erythematotelangiectatic, papulopustular, phymatous, and ocular. Purpose: To review the different kinds of management for all subtypes. Methods: We divided rosacea management into three main categories: patient education, skin care, and pharmacological/procedural interventions. Results: Flushing...

Goal is to investigate how delivery nozzle design influences the cooling rate of cryogen spray as used in skin laser treatments. Cryogen was sprayed through nozzles that consist of metal tubes with either a narrow or wide diameter and two different lengths. Fast-flashlamp photography showed that the wide nozzles, in particular the long wide one, produced a cryogen jet (very small spray cone ang...

BACKGROUND Verrucae vulgaris can be removed in a variety of ways but a specific therapy of choice has not yet been developed. Doctors are faced with a challenge, especially in the treatment of recalcitrant warts. It has been suggested that the success of pulsed dye laser treatment lies in the fact that warts contain an increased number of dilated blood vessels. METHODS Seventy-three patients ...

We built a transient absorption spectrophotometer that can determine transient absorption spectral changes that occur at times as fast as approximately 200 ns and as slow as a minute. The transient absorption can be induced by a temperature-jump (T-jump) or by optical pumping from the deep ultraviolet (UV) to the infrared (IR) by use of single ns Nd:YAG laser pulses. Our use of a fiber-optic sp...