Mid-infrared upconversion is a technique that shows great potential for obtaining mid-infrared images using visible imaging sensors with outstanding sensitivity, response speed, and resolution. However, the visible light produced after conversion is often weak. To address this issue, this study proposes mid-infrared upconversion ghost imaging and evaluates its feasibility.

Outcome：

2023
We conducted numerical simulations to explore the use of single-wavelength coherent light, single-wavelength incoherent light, and multi-wavelength incoherent light for mid-infrared upconversion ghost imaging. Our findings indicate that the resolution degradation caused by interference is lower when using single-wavelength incoherent light as compared to single-wavelength coherent light. However, distortion can occur when using a multi-wavelength light source due to the difference in magnification for each wavelength during upconversion. We also discovered that image deterioration can be reduced by using a compressed sensing method as an image reconstruction technique.

The importance of real-time current measurement is increasing with the rise in renewable energy generation. Optical fiber current sensors offer advantages such as remote measurement and no risk of electric shock. These sensors use materials with a high Verdet constant and a photoelastic coefficient of zero. Lead silicate glass has been the traditional material of choice, but its use is restricted due to regulations. The objective of this research is to find lead-free tellurite glass that can replace lead silicate glass.

Outcome：

2023
By searching for the glass compositions in TeO₂-ZnO-Li₂O-Bi₂O₃ system glasses, we found glass compositions with lower photorealistic constant than that of conventional glass materials. We fabricated single-mode fibers using these glasses and confirmed the rotation of polarized light by magnetic fields.

Here, we realize infrared image transmission fibers using non-silica glasses.

Outcome：

2022
In 2017, Stone et al. presented a silica multicore fiber with low index contrast image thanks to a special structure where same sized cores would never be neighbors, decreasing significantly the crosstalk between cores. More recently, Tuan et al. successfully created a long (10cm) all-solid tellurite glass disordered fiber (TDOF) with good image transportation at different wavelength (1.4 to 1.6µm). It is, though, known that the problem of disordered fiber is that image transmission can be distorted due to oversized clusters of fibers of same refractive indices. By coupling these two research, this work tries to find how to obtain better results compared to the TDOF previously reported in view of coupling efficiency or image resolution by using a honeycomb-like network with different sized neighbor cores with controlled randomness.

2021
Programmation for beam pattern evolution of a new fiber structure was made and early interesting results started to appear

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jnoncrysol.2023.122760

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Optica Publishing group  

DOI： https://doi.org/10.1364/AO.491443

Other Link： https://doi.org/10.1364/AO.491443

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.yofte.2023.103343

Event date： 2024.3

Presentation type：Oral presentation (general)  

Event date： 2024.3

Presentation type：Oral presentation (general)  

Event date： 2024.1 - 2024.2

Presentation type：Oral presentation (general)  

Event date： 2023.9

Presentation type：Oral presentation (general)  

Event date： 2023.3

Language：English   Presentation type：Oral presentation (general)