Thorough exploration of optical performance of waveguides made on Cr: LiSAF by femtosecond laser writing.

BIASETTI, DEMIAN A.; TORCHIA, GUSTAVO A.; DI LISCIA EMILIANO

San Jose

Conferencia; Frontier in Optics and Laser Science; 2015

Optical Society of America

Optical waveguides femtosecond micromachining has become an extended fabrication method due to the reduction on fabrication stages number and also the wide range of processing materials. [1],[2]. In this work we report first waveguides structures fabricated in a 1% doped Cr:LiSAF crystal sample by using femtosecond laser micromachining with energies from 1 to 7 μJ per pulse and with scanning speed from 15 to 45 μm/s, and also we characterized the optical wave guiding performance using and ?end-fire? coupling system. We found good wave guiding qualities for both, TM and TE polarization modes for 2 and 3 μJ as well as acceptable losses according to expecting values in view of technological applications. By other side, a high resolution - luminescence spatial mapping of the cross-section waveguides was performed, corresponding to the of 4T2  4A2 vibronic transition, in order to investigate in a thorough way the induced stress that leads to refractive index variation. For a first time a summary of influence of micromachining parameters on both optical guiding and spectroscopic emission in Cr: LiSAF is reported.