Charged Particle Sources
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Chirped dielectric laser mirrors offer a general solution for broadband feedback and dispersion control in femtosecond laser systems. Chirped mirrors were developed for mode-locked solid-state lasers, femtosecond parametric oscillators, chirped pulse amplification systems and pulse compressors for dispersive compensation and to get a broader reflection bandwidth. The principle of operation of these mirrors is that different wavelengths penetrate the layers of the mirror coating to various depths thus creating dispersion (delay) within the spectrum of wavelengths. A double chirped design has been also devised which turns on the coupling between counter propagating waves and removes Fresnel reflection with an application of anti-reflection film. Double-chirped mirror designs can also be utilized with semiconductor mirrors to generate much higher amount of dispersion.