Abstract
We investigate the possibility of tailoring coherent Raman generated spectra via adaptive wavefront optimization. Our technique combines a spatial light modulator and a spectrometer providing a feedback loop. The algorithm is capable of controlling the Raman generation, producing broader spectra and an improved overall efficiency, and increasing the intensity of high-order sidebands. Moreover, by wavefront optimization we can extend the generated spectra towards the blue spectral region and increase the total power of generated sidebands. Mutual coherence and equal frequency separation of the multiple Raman sidebands are of interest for the synthesis of ultrashort light pulses with the total spectral bandwidth extending over ultraviolet, visible and near-infrared wavelengths.
Highlights
Broadband coherent Raman generation results from molecular modulation in Raman-active media[1]
We demonstrate the ability of adaptive optics to increase the intensity of Raman sidebands using the wavefront optimization
We show that the same technique extends the total spectral bandwidth of Raman sideband generation by phase-only corrections to the pump beam profile
Summary
Broadband coherent Raman generation results from molecular modulation in Raman-active media[1] This process provides a promising way towards the synthesis of sub-cycle pulses of coherent light covering the ultraviolet-visible-near infrared range (UV-VIS-NIR)[2,3,4,5]. In highly dispersive media (crystals)[13] fulfilling the phase-matching conditions is important for producing Raman sidebands efficiently[14,15,16] Overall, these conditions depend on factors such as the refractive index at each of the wavelengths involved, the crossing angle between the two input laser beams, and the interaction length in the Raman medium[17]. Works indicate that the phase-matching conditions for noncollinear cascaded Raman generation in highly dispersive media are nontrivial and need further theoretical and experimental study
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