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Grating-assisted generation of regular two-dimensional multicolored arrays in a tellurite glass

Hang Zhang, Fangteng Zhang, Yongze Yu, Xi Du, Guoping Dong, and Jianrong Qiu

Open Access Open Access

Abstract

A grating structure was inscribed in a tellurite glass after irradiation with high-repetition rate femtosecond laser pulses. High diffraction efficiency was obtained due to the large refractive index change, which was caused by the precipitation of Te crystals in the laser modified region. Two-dimensional multicolored arrays were generated by cascaded four-wave mixing (CFWM) together with the prefabricated grating structure, which showed much more superior than those induced by beam breakup.

© 2014 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 Micro-Raman spectra measured at the femtosecond laser irradiated region and unirradiated region, respectively. The inset shows the microscope image of grating structure and diffraction pattern of a He-Ne laser at 632.8 nm.

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Fig. 2
Fig. 2 One- and two-dimensional multicolored patterns generated in Te glass without grating structure. The input power densities of beam_1 and beam_2 were (a) 28.5 × 109 and 15.5 × 109 W/cm2, (b) 55 × 109 and 35 × 109 W/cm2, and (c) 90 × 109 and 70 × 109 W/cm2, respectively.

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Fig. 3
Fig. 3 (a) Diffracted pattern of two input femtosecond laser beams. The input power densities of beam_1 and beam_2 were 10 × 109 and 8 × 109 W/cm2, respectively. Regular two-dimensional multicolored arrays generated in Te glass with grating structure. The input power densities of beam_1 and beam_2 were (b) 55 × 109 and 35 × 109 W/cm2, and (c) 90 × 109 and 70 × 109 W/cm2, respectively. (c) Definition of two-dimensional multicolored arrays. (e) Spectra of sidebands (m, 0) ( 13 ≥ | m | ≥ 1 ).

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Fig. 4
Fig. 4 Spectral profiles of sidebands (a) (4, n) ( n ≥ 0 ), and (b) (4, n) ( n ≤ 0 ).

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