Abstract
The femtosecond laser writing with double-line technique was employed to fabricate buried channel waveguides with different widths in Yb:YVO4 crystal. Model profiles of the waveguides were captured using the endface coupling setup at the wavelength of 633 nm under TE and TM polarization. Furthermore, the confocal micro-Raman spectra in bulk and waveguide areas were studied at the wavelength of 633 nm. The enhanced Raman intensity were performed in waveguide areas.
Highlights
Yttrium vanadate (YVO4) is isostructural and crystallizes in the tetragonal space group D149h with four molecules per unit cell (Z 4), which is an attractive laser host material for producing new highly efficient micro and diode-pumped systems [1,2,3]
The results show that S1 cannot confine the 633 nm laser light under both TE and TM polarization, while S2 only confines the 633 nm laser light under TM polarization. 12 μm (S2) maybe the lower limit width of mode transmission in Yb: TABLE 2 | Observed modes of YVO4 crystals and the corresponding experimental results
The enhanced intensity of confocal micro-Raman peaks at 888, 836, and 485 cm−1 were performed with increasing waveguide width in S1, S2, S3, and S4, making the obtained waveguides promising candidates for the development of integrated self-Raman laser sources
Summary
Yttrium vanadate (YVO4) is isostructural and crystallizes in the tetragonal space group D149h with four molecules per unit cell (Z 4), which is an attractive laser host material for producing new highly efficient micro and diode-pumped systems [1,2,3]. YVO4 crystals are largely fabricated at lower cost due to the excellent optical quality with larger hardness and better water insolubility [4,5,6]. Rareearth ions doped in YVO4 exhibit excellent properties [4, 6]. Nd ions doped with YVO4 in a common diode-pumped solid state laser have been studied extensively [7]. Just like Yb doped laser medium, Yb doped YVO4 crystals possess strong absorption band near 985 nm, high thermal conductivity, and broad gain bandwidth [8, 9], showing potential applications in continuous-wave, Q-switched and mode-locked [6]. The study on the optical properties of Yb:YVO4 crystals is essential and significant
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