Optical: systems and elements – Optical frequency converter – Dielectric optical waveguide type
Patent
1997-05-07
1999-09-21
Moskowitz, Nelson
Optical: systems and elements
Optical frequency converter
Dielectric optical waveguide type
359341, 359343, 385 3, G02F 116, H01P 312
Patent
active
059561734
ABSTRACT:
Our invention achieves spectral broadening of an input pulse by propagating it through a hollow fiber filled with a noble gas. The output pulse is then compressed to a shorter duration by passing it through an optical system consisting of phase dispersive elements. In a preferred embodiment, the input pulse is generated by a mode-locked laser, amplified and then subsequently compressed to produce an input pulse of high peak power. This input pulse is then focused into a hollow cylindrical fiber made of fused silica and mounted inside a pressure vessel filled with noble gas. The optics are designed to match the spatial mode volume of the input pulse to that of the entrance aperture of the hollow fiber. Light is constrained to propagate down the hollow fiber and generates additional bandwidth through self-phase modulation as it interacts with the gas contained therein. The spectrum of the pulse after propagation through the gas is frequency chirped. A portion or all of this bandwidth is then compressed using prisms to produce a laser pulse of shorter duration than the input pulse.
REFERENCES:
patent: 3558891 (1971-01-01), Kaiser
patent: 4588957 (1986-05-01), Balant et al.
patent: 4913507 (1990-04-01), Stamnitz et al.
Nisoli et al, Optics Letters, vol. 22, #81 pp. 522-524, Apr. 15, 1997; abstract only herewith.
Castillejo et al, Applied Physics B, vol. B45, #4, pp. 293-299, Apr. 1988; abst. only herewith.
De Silvestri Sandro
Nisoli Mauro
Svelto Orazio
Consiglio Nazionale Delle Ricerche
Moskowitz Nelson
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