Femtosecond laser-inscribed waveguides in Nd3+∶y3+∶SrF2 crystals
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摘要:
Optical waveguides are fabricated in Nd3+:y3+:SrF2 crystals by a 1-kHz femtosecond laser using the double-line approach.Waveguides with different separations (10,15,and 20 μm) between two consecutive optical breakdown tracks are produced,and their optical performances are explored by end-fire coupling to 780-and 532-nm lasers.Propagation loss of the waveguide with 20-μm separation is estimated.The microphotoluminescence and micro-Raman spectra indicate that the original fluorescence and lattice structure of the Nd3+:y3+:SrF2 crystals are well preserved in the waveguide.Therefore,the obtained waveguide structures are promising candidate for application in integrated waveguide lasers.