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Bubble Laser
An ordinary Bubble_(physics), bubble can serve as an optofluidics, optofluidic laser. These bubble lasers have been made of dye-doped soap solutions and Liquid crystal#Smectic_phases, smectic liquid crystal. In a bubble laser, the bubble itself serves as the optical cavity, optical resonator. Uniquely, bubble lasers exhibit hundreds of regularly spaced resonant frequencies called ''whispering gallery modes'', named for the Whispering Gallery in St. Paul's Cathedral in London. Researchers have found that the emission spectrum of a bubble laser is highly dependent on the bubble's environment; changing ambient air pressure or electric fields changes the size of the bubble (the optical resonator), and therefore the wavelengths of laser emission. Description Bubble lasers have been made from soap solutions to which a few drops of fluorescent Dye laser, laser dye have been added. The fluorescent dye acts as the gain medium. When a pump laser is shone onto the bubble, the dye molecules a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bubble (physics)
A bubble is a :wikt:globule, globule of a gas substance in a liquid. In the opposite case, a globule of a liquid in a gas, is called a drop (liquid), drop. Due to the Marangoni effect, bubbles may remain intact when they reach the surface of the immersive substance. Common examples Bubbles are seen in many places in everyday life, for example: * As spontaneous nucleation of supersaturated carbon dioxide in soft drinks * As vapor in boiling water * As air mixed into agitated water, such as below a waterfall * As sea foam * As a soap bubble * As given off in chemical reactions, e.g., baking soda + vinegar * As a gas trapped in glass during its manufacture * As the indicator in a spirit level * As bubble gum Physics and chemistry Bubbles form and coalesce into globular shapes because those shapes are at a lower energy state. For the physics and chemistry behind it, see nucleation. Appearance Bubbles are visible because they have a different refractive index (RI) than the surrou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |