Table 1 Summary of the parameters for the three types of FPOV pulses

From: Generation of femtosecond polygonal optical vortices from a mode-locked quasi-frequency-degenerate laser

FPOV

PPump (W)

PQFD-HG (W)

PFPOV (W)

τs (nm)

τp (fs)

frep (MHz)

ηO-O

β

Sp

Square

17.5

1.4

1.3

3.0

389

116.8

8.0%

95.5%

1.3%

Pentagonal

17.6

1.9

1.8

2.7

430

116.3

10.8%

96.2%

1.0%

Hexagonal

18.6

1.3

1.2

2.5

472

116.2

7.0%

96.1%

0.9%

  1. PPump pump power, PQFD-HG average power of the QFD-HG pulses, PFPOV average power of the FPOV pulses after the conversion from QFD-HG modes, τs spectra width of the FPOV pulses, τp pulse width of the FPOV pulses, frep repetition frequency of the FPOV pulses, ηO-O optical-to-optical efficiency from the pump laser to the generated femtosecond QFD-HG laser, β mode purity calculated by performing the quantitative normalized cross-correlation function between the experimental FPOVs and the simulation FPOVs, Sp the measured power stability of femtosecond QFD-HG laser (RMS)
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