Abstract
For the first time we report the results of both numerical simulation and experimental observation of second-harmonic generation as an example of non-linear frequency conversion of pulses generated by passively mode-locked fiber master oscillator in different regimes including conventional (stable) and double-scale (partially coherent and noise-like) ones. We show that non-linear frequency conversion efficiency of double-scale pulses is slightly higher than that of conventional picosecond laser pulses with the same energy and duration despite strong phase fluctuations of double-scale pulses.
Highlights
Fiber lasers mode-locked due to non-linear polarization evolution (NPE) effect [1] are known as a convenient and efficient tool to produce ultra-short optical pulses with scalable pulse duration and energy [2,3,4]
We investigate for the first time applicability of double-scale pulses obtained from allnormal dispersion fiber lasers mode-locked via NPE for non-linear frequency conversion using second harmonic generation (SHG) in a crystal with spectral acceptance bandwidth exceeding the pulse spectrum width, as one of the most basic examples
If we adjust the settings of PC2, we can gradually tune the laser from the conventional lasing regime via intermediate one towards noise-like generation
Summary
Fiber lasers mode-locked due to non-linear polarization evolution (NPE) effect [1] are known as a convenient and efficient tool to produce ultra-short optical pulses with scalable pulse duration and energy [2,3,4]. These lasers operate in a diversity of generation regimes [5] and are capable to generate pulses of different shape [6,7,8,9]. We investigate for the first time applicability of double-scale pulses obtained from allnormal dispersion fiber lasers mode-locked via NPE for non-linear frequency conversion using second harmonic generation (SHG) in a crystal with spectral acceptance bandwidth exceeding the pulse spectrum width, as one of the most basic examples
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