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Optical layout of the ultrashort visible pulse source. PPLN: periodically poled lithium niobate crystal. HC-PBG fiber: hollow-core photonic band gap fiber.
Optical spectrum and autocorrelation trace of the pulses before (a) and after (b) HC-PBG fiber.
(Color online) Pulse duration and spectral width evolution with amplifier output power. (a) Optical spectrum of output pulses for different amplifier powers, with autocorrelation trace of the pulse with the smallest spectral bandwidth shown as inset (b).
Optical spectrum of the second-harmonic green light.
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