High efficiency second harmonic generation of nanojoule-level femtosecond pulses in the visible based on BiBO

Mario Galletti; Hugo Pires; Victor Hariton; Celso Paiva João; Swen Künzel; Marco Galimberti; Gonçalo Figueira

doi:10.1017/hpl.2018.72

Journals >High Power Laser Science and Engineering >Volume 7 >Issue 1 >Page 01000e11 > Article

High Power Laser Science and Engineering
Vol. 7, Issue 1, 01000e11 (2019)

High efficiency second harmonic generation of nanojoule-level femtosecond pulses in the visible based on BiBO

Mario Galletti^1、2, Hugo Pires¹, Victor Hariton¹, Celso Paiva João¹, Swen Künzel¹, Marco Galimberti², and Gonçalo Figueira¹

Author Affiliations

¹GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal

²Central Laser Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX, UK

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DOI: 10.1017/hpl.2018.72 Cite this Article Set citation alerts

Mario Galletti, Hugo Pires, Victor Hariton, Celso Paiva João, Swen Künzel, Marco Galimberti, Gonçalo Figueira. High efficiency second harmonic generation of nanojoule-level femtosecond pulses in the visible based on BiBO[J]. High Power Laser Science and Engineering, 2019, 7(1): 01000e11 Copy Citation Text

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$Experimental setup in SHG experiment. $\unicode[STIX]{x1D706}/2,\unicode[STIX]{x1D706}/4$: waveplates; EC: pump energy control; FL: focusing lens; C: nonlinear crystal; CL: collimating lens; DM: dichroic mirror; FM: flip mirror; SM: spectrometer; CAM: camera; PM: power meter; SA: spectrum analyzer; PC: computer.$

Fig. 1. Experimental setup in SHG experiment. $\unicode[STIX]{x1D706}/2,\unicode[STIX]{x1D706}/4$: waveplates; EC: pump energy control; FL: focusing lens; C: nonlinear crystal; CL: collimating lens; DM: dichroic mirror; FM: flip mirror; SM: spectrometer; CAM: camera; PM: power meter; SA: spectrum analyzer; PC: computer.

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Fig. 2. Comparison between pump and SHG spatial profile, respectively.

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Fig. 3. Autocorrelation measurement of the pulse at 1030, 1054, 1000 and 980 nm for top left, top right, bottom left and bottom right, respectively.

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Fig. 4. Input (red) and depleted (orange) signal spectra for 1030, 1054, 1000 and 980 nm pulses.

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Fig. 5. SHG power versus input power at different wavelengths.

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Fig. 6. SHG efficiency versus input energy and average power for different wavelengths.

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Fig. 7. Comparison (measured and simulated data) of the SHG efficiency as a function of the input intensity for different wavelengths.

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Fig. 8. Experimental and simulated second harmonic generation spectrum of 1030 nm pumping beam.

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Fig. 9. SHG efficiency versus focal spot diameter at two different energies: 3.7 and 3.8 nJ for the same crystal length.

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Fig. 10. Second harmonic generation simulation determining the temporal length of the SHG pulse.

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$\unicode[STIX]{x1D706}$ (nm)	$\unicode[STIX]{x1D70F}_{\text{AC}}$ (fs)	$\unicode[STIX]{x1D70F}_{\text{pulse}}$ (fs)	$\unicode[STIX]{x0394}\unicode[STIX]{x1D706}$ (nm)	$\unicode[STIX]{x1D70F}_{\text{pulse}}^{\text{TL}}$ (fs)
1030	164	116	14.3	109
1054	174	123	16.1	101
1000	225	159	12.4	118
980	263	186	9.3	152

Table 1. Autocorrelation and spectral experimental data.

$\unicode[STIX]{x1D70F}_{\text{AC}}$

– FWHM of the autocorrelation trace,

$\unicode[STIX]{x1D70F}_{\text{pulse}}$

– retrieved Gaussian FWHM pulse length,

$\unicode[STIX]{x0394}\unicode[STIX]{x1D706}$

– spectral FWHM bandwidth and

$\unicode[STIX]{x1D70F}_{\text{pulse}}^{\text{TL}}$

– supported (transform-limited) pulse length.

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$\unicode[STIX]{x1D706}$ (nm)	$\unicode[STIX]{x0394}\unicode[STIX]{x1D706}$ (nm)	$\unicode[STIX]{x1D70F}_{\text{SHG}}^{\text{TL}}$ (fs)
515	2.98	130.6
527	3.89	104.5
500	3.16	118.2
490	1.89	186.5

Table 2. SHG spectral experimental data.

$\unicode[STIX]{x0394}\unicode[STIX]{x1D706}$

represents the FWHM bandwidth of the SHG spectrum and

$\unicode[STIX]{x1D70F}_{\text{SHG}}^{\text{TL}}$

the retrieved FWHM of the supported SHG pulse temporal length assuming Gaussian shape.

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