Abstract
We demonstrated a straightforward approach to generate red and near-infrared laser emissions by a Raman-assisted four wave mixing (FWM) process in a nonlinear Yb-doped fiber amplifier, delivering 342 fs pulses of 241 nJ at 864 nm, 834 fs pulses of 21 nJ at 751 nm, and 1.9 ps pulses of 3.8 μJ at 1030 nm. A pair of gratings was employed as the pre-compressor to promote the intensity of the fundamental wave in the main amplifier. Multiple wavelengths from 751 to 1273 nm resulted due to cascaded-Raman-assisted FWM. The pre-compression also underlay the achievement of 25.1, 701, and 2000 kW peak power for the red (751 nm), near-infrared (864 nm), and fundamental (1030 nm) components respectively, which restrained the gain narrowing effect during the amplification. It finally led to shorter pulse duration under increased power.
Highlights
Supercontinuum generation via frequency conversion provides a way to extend the frequency coverage of a fiber laser, which is usually required in scientific and industrial applications, such as coherent anti-Stokes Raman scattering spectroscopy, stimulated emission depletion microscopy, fluorescence polymersomes, biological sensing, and ophthalmopathic treatments [1,2,3,4]
We present nonlinear parametric amplification in the red and near-infrared region via cascaded-Raman-assisted four wave mixing (FWM) processes by pre-compressing the input pulse of the main amplifier [12,13,14]
The first and second pre-amplifiers consisted of a Yb-doped, 6/125 single mode fiber (SMF)
Summary
Supercontinuum generation via frequency conversion provides a way to extend the frequency coverage of a fiber laser, which is usually required in scientific and industrial applications, such as coherent anti-Stokes Raman scattering spectroscopy, stimulated emission depletion microscopy, fluorescence polymersomes, biological sensing, and ophthalmopathic treatments [1,2,3,4]. Various approaches have been extensively exploited to manage effective parametric wave generation by FWM processes. One way is to monitor the geometrical parameters in a photonic crystal fiber (PCF) in order to retain the phase matching for frequency conversion. By this scheme, watt-level supercontinuum was generated from either CW pumped or pulsed-systems [7]. Watt-level supercontinuum was generated from either CW pumped or pulsed-systems [7] Another way is to introduce birefringence-assisted FWM by propagating a fundamental wave along one of the polarization axes, while Stokes and anti-Stokes waves are propagated along the orthogonal polarization axis. Petersen et al demonstrated that the parametric gain can be tuned on and off by switching the polarization direction of the pump field between the fast and slow axes of a hybrid
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