MIT VERTEILTER RUECKKOPPLUNG ARBEITENDER LASER

A laser with distributed feedback utilizes an active laser medium, especially a dye solution contained in a cell, excited by a pump radiation beam that passes through an optical grating or like device, and an optical imaging system arranged between the optical device and the laser medium; the imaging system, in combination with the optical device, forms a striped pump radiation pattern in the laser medium. The optical imaging system contains a microscope lens in retro position, or another scale reducing or demagnifying lens system, and may optionally, include a variable-focus lens for altering the imaging scale and, therefore, the wavelength of the laser emission.