Second harmonic generation of continuous wave ultraviolet light and production of β-BaB2O4 optical waveguides

Abstract

We report on the generation of continuous-wave (cw) ultraviolet (UV) laser light at λ=278nm by optical frequency doubling of visible light in β-BaB2O4 waveguides. Ridge-type waveguides were produced by He+ implantation, photolithography masking, and plasma etching. The final waveguides have core dimension of a few μm2 and show transmission losses of 5dB∕cm at 532nm and less than 10dB∕cm at 266nm. In our first experiments, a second harmonic power of 24μW has been generated at 278nm in an 8mm long waveguide pumped by 153mW at 556nm.

Cr:LiSrAlF6 channel waveguides as broadband fluorescence sources

“…For producing Cr:LiSAF channel optical waveguides we used a three-step process based on light ion implantation, lithographic patterning and Ar + sputtering. In the past, we have already demonstrated the suitability of this method for the waveguide fabrication in various inorganic [14][15][16] and organic [17] nonlinear optical crystals. In our experiments we used 5.5% doped optically polished Cr:LiSAF crystals.…”

Planar optical waveguides formed in β-BBO by MeV O+ implantation

“…In those planar optical waveguides, an optical barrier has happened at the end of the track, just like other cases of light ion-implanted waveguides. Recently, the ridge-type optical waveguides in b-BBO crystal formed by H + ions implantation and femtosecond laser ablation technique [12] and the second harmonic generation of deep UV laser light in the H + -implanted b-BBO crystal have been achieved [13]. In this paper, we report the formation of planar waveguides in b-BaB 2 O 4 crystals by 2.8 MeV O + ion implantation at the doses of 8x10 14 and 2x10 15 ions/cm 2 at room temperature.…”

Optical Waveguides Fabricated by Ion Implantation/Irradiation: A Review Optical Waveguides Fabricated by Ion Implantation/Irradiation: A Review

“…Important progresses have been made as well in the development of ultraviolet integrated optics devices based on barium-borate (BBO) crystals (Poberaj et al, 2009 Degl'Innocenti et al, 2006a, 2008. Finally, optical planar waveguides produced in the new nonlinear Ca 4 GdO(BO 3 ) 3 crystal by ionic implantation have also shown SHG significant conversion efficiency that can be increased after applying a thermal treatment .…”

“…He + , Cu 2+ and Ni 2+ ions have been used for this task in recent years. For example, Degl'Innocenti and collaborators (Degl'Innocenti et al, 2006a; have (Figure 14). First, BBO crystals were implanted with He + i o n s t o f o r m p l a n a r o p t i c a l waveguides and subsequently ridge waveguides were micromachined using femtosecond laser ablation (Degl'Innocenti et al, 2006b).…”

“…First, BBO crystals were implanted with He + i o n s t o f o r m p l a n a r o p t i c a l waveguides and subsequently ridge waveguides were micromachined using femtosecond laser ablation (Degl'Innocenti et al, 2006b). Moreover, they also produced the same type of waveguides by means of He + implantation, photolithography masking, and plasma etching (Degl'Innocenti et al, 2006a). Finally, they demonstrated the potential of these waveguides for the second harmonic generation of continuous-wave deep-UV laser light, exploiting the nonlinear optical properties of BBO crystal (Degl'Innocenti et al, 2008;Poberaj et al, 2009).…”