Abstract
Ultrashort pulse generation in the 1600 nm wavelength region is required for deep-tissue biomedical imaging. We report on the characterization and adaptive compression of a multi-soliton output spanning >300 nm from a large-mode area photonic-crystal fiber rod for two separate laser setups. Sub-30 fs pulses are generated by first compressing of each soliton individually, and then followed by coherently combining all of the pulses in the train, which are separated by hundreds of femtoseconds. Simulations of the source, together with amplitude and phase coherence measurements are provided.
Highlights
Long-wavelength (1600-1800 nm) femtosecond pulses and the detection of their higher-order nonlinear optical signals such as third-harmonic generation and four-photon excited fluorescence have led to unprecedented accomplishments in deep-tissue biomedical imaging [1,2]
Ultrashort pulse generation in the 1600 nm wavelength region is required for deeptissue biomedical imaging
We report on the characterization and adaptive compression of a multi-soliton output spanning >300 nm from a large-mode area photonic-crystal fiber rod for two separate laser setups
Summary
Long-wavelength (1600-1800 nm) femtosecond pulses and the detection of their higher-order nonlinear optical signals such as third-harmonic generation and four-photon excited fluorescence have led to unprecedented accomplishments in deep-tissue biomedical imaging [1,2]. We use a programmable pulse shaper to characterize, compress and coherently combine this complex multi-soliton source in order to achieve greater peak intensity, bandwidth and shorter pulse durations. Successful compression of these types of sources can lead further advances in multi-photon microscopy because a factor of ~3.16 reduction in the pulse duration results in a 10x enhancement of the third-order nonlinear optical signal, and a ~32x enhancement of the fourth-order optical signal [2,9]. Results from two different laboratories presented here indicate the approach presented is robust
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