Abstract
A spectro-temporal filtering method is proposed to increase the contrast ratio of chirped pulses. The advantages of this method include easy cascading, high transmission, and it can also be used in the high-energy chirped pulse amplifier (CPA) system. The effectiveness of the proposed method was experimentally verified by operating the spectro-temporal filtering method on a Ti:sapphire CPA system and then measuring the contrast ratio of pulse based on optical Kerr gate effect(OKG). The measuring result demonstrated that, after passing through one-stage spectro-temporal filtering system with transmittance up to 70%, the contrast ratio of the pulse was improved by an order of magnitude.
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