Abstract
We demonstrate an energetic dual-wavelength ultrashort pulsed source by exploiting the inherent features of the newly discovered process of soliton self-mode conversion (SSMC) in a multimode fiber. The generated pulses are at wavelengths of 1205 nm and 1273 nm, respectively, and the pulse energies are approximately 30 nJ. The natural group-velocity-locking feature of SSMC ensures minimal relative timing jitter, hence highlighting the utility of exploiting the new degrees of freedom afforded by field of multimode nonlinear fiber optics. The relative timing jitter is evaluated by measuring the power fluctuations of generated sum-frequency signals. When compared to a conventional fiber based dual-wavelength source based on traditional frequency-shifted solitons, the relative timing jitter is found to be reduced by greater than 11 dB. Since this process is wavelength-agnostic within the transparency window of optical fibers, our source provides an attractive means of achieving integrated multi-color ultrashort pulse sources for a variety of applications.
Highlights
IntroducationSources operating at two wavelengths are essential for pump-probe experiments, such as stimulated Raman scattering microscopy (SRS) [1] and coherent anti-Stokes Raman (CARS) microscopy [2], and for mid-IR and THz generation via difference frequency generation [3]
We demonstrate an energetic dual-wavelength ultrashort pulsed source by exploiting the inherent features of the newly discovered process of soliton self-mode conversion (SSMC) in a multimode fiber
The LP0,21 mode is excited in a higher order mode (HOM) step index fiber, with a core diameter of 97 μm and a numerical aperture of 0.34, using a binary phase plate inscribed on a spatial light modulator (SLM) [17]
Summary
Sources operating at two wavelengths are essential for pump-probe experiments, such as stimulated Raman scattering microscopy (SRS) [1] and coherent anti-Stokes Raman (CARS) microscopy [2], and for mid-IR and THz generation via difference frequency generation [3]. ∼100-fs) pulsed sources, useful for applications such as hyperspectral imaging via spectral focusing for CARS and SRS [11,12] or mid-IR generation [3], is, limited This is because, in fibers of useful enough lengths to be used as flexible media, the long propagation lengths and group-velocity fluctuations, due to environmental or nonlinear instabilities, lead to relative timing jitter [13]. For fibers of longer lengths, a common approach is to divide the output of a fiber laser and subsequently frequency convert one of these spectral lines via a nonlinear process, e.g. soliton self-frequency shifting (SSFS), and combine these two outputs to form a dual-wavelength ultrafast source [12] In such cases, the magnitude of the resultant timing-jitter can even exceed the pulse duration,. The relative timing jitter between these pulses is analyzed via sum frequency generation (SFG), and the results is compared to a more conventional pump and SSFS approach
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