[18p-P10-1~4] 3.16 Optics and Photonics English Session

▲ [18p-P10-4] Supercontinuum generation in tantalum pentoxide based optical waveguide

〇Chung-Lun Wu¹, Chao-Wei Liu¹, Pin-Shuo Hwang¹, Chin-Yu Liu¹, Min-Hsiung Shih^1,2,3, Ann-Kuo Chu¹, Chao-Kuei Lee¹ (1.DOP, NSYSU, Taiwan, 2.RCAS, Sinica, Taiwan, 3.DOP, NCTU, Taiwan)

Keywords:tantalum pentoxide, Supercontinuum generation, nonlinear optics

In this work, the supercontinuum generation has been demonstrated in a 5-mm-long Ta₂O₅ channel waveguide. By injecting a 100-fs pulse laser at central wavelength of 1-um, the output spectrum of Ta₂O₅ waveguide shows an octave spanning (at -30dB). In addition, the strong visible light at 644 nm is observed in the supercontinuum spectrum, which is attributed to the dispersive wave generation. The position of such dispersive wave can be tunable by changing the waveguide dimension. By increasing the waveguide width from 1500 nm to 2000 nm, the strong visible peak is blue-shifted from 644 nm to 536 nm. Our primary result shows that Ta₂O₅ has great potential in developing visible to infrared broadband light source, which can be applied in optical coherence tomography and frequency metrology.