Compact fibre-based coherent anti-Stokes Raman scattering spectroscopy and interferometric coherent anti-Stokes Raman scattering from a single femtosecond fibre-laser oscillator

Pramana

Vikas Kumar¹  Alessio Gambetta1¹  Cristian Manzoni¹  Marco Marangoni¹  Roberta Ramponi¹  Giulio Cerullo¹ 

[1] Dipartmento di Fisica-Politecnico di Milano, ULTRAS-CNR-INFM, IFN-CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy$$

关键词: Coherent anti-Stokes Raman scattering;    nonlinear spectroscopy;    coherent spectroscopy;    interferometric CARS.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

We demonstrate a new approach to CARS spectroscopy by efficiently synthesizing synchronized narrow-bandwidth (less than 10 cm-1) pump and Stokes pulses (frequency difference continuously tunable upto ∼ 3000 cm-1) based on spectral compression together with second harmonic generation (in periodically-poled nonlinear crystals) of femtosecond pulses emitted by a single compact Er-fibre oscillator. For a far better signal to non-resonant background contrast, interferometric CARS (I-CARS) is demonstrated and CARS signal enhancement upto three orders of magnitude is achieved by constructive interference with an auxiliary local oscillator at anti-Stokes field, also synthesized by spectral compression of pulses emitted from the same fibre oscillator.

【 授权许可】

Unknown