Session Index

Optical Design

Optical Design IV
Saturday, Dec. 5, 2020  10:30-12:30
Presider: Prof. Chien-Chung Lin
Room: 6AB Room 527
10:30 - 10:45 Manuscript ID.  0297
Paper No.  2020-SAT-S0504-O001
Dong Bao To
Dark Line Laser
Dong Bao To;Hsiung Ming Wu;Chieh Yen Huang

We demonstrate a laser that is prohibited to emit at a particular wavelength, called a dark line, in the emission background of its gain spectrum. The dark line laser is generated from the high-loss resonances of a 150-μm thick etalon mirror in an ytterbium doped fiber laser.

10:45 - 11:00 Manuscript ID.  0424
Paper No.  2020-SAT-S0504-O002
Jia-Hao Hsu
Plasmonic Bound States in the Continuum in Periodic Metal Structures
Jia-Hao Hsu;Jia-Hao Hsu

We numerically analyzed the bound states in the continuum (BICs) in 1D periodic metallic bar structures and found the accidental BICs. By changing the parameters of the metal structure, we verify the topological nature of the BICs which move along the Brillouin zone and persist under fine-tuning.

11:00 - 11:15 Manuscript ID.  0415
Paper No.  2020-SAT-S0504-O003
I-Cheng Liu
NH3 Photoacoustic Gas Sensing at 1550 nm
I-Cheng Liu;Pei-Ling Luo

We demonstrated the NH3 gas sensing by means of DFB tunable laser coupled with a photoacoustic cell near 1550 nm. The detection limit of NH3 was estimated to be 25 ppm. Furthermore, in the flowing system, the noise can be restrained by using differential photoacoustic detection.

11:15 - 11:30 Manuscript ID.  0694
Paper No.  2020-SAT-S0504-O004
Guang-Yan Liu
Eliminate spherical aberration of ball lens by using meta-corrector
Guang-Yan Liu;Jui-Wen Pan;Chih-Ming Wang

In this study, the spherical aberration is eliminated via a free-form phase correction function designed by using Zemax. In the measurement, we add the phase function into a SLM. The spot size is reduced 23%. In the future, a metasurface for eliminating the aberration will be fabricated and measured.

11:30 - 11:45 Manuscript ID.  0380
Paper No.  2020-SAT-S0504-O005
Wu Yu-Cheng
Model-based Adaptive Optics System with FPGA
Wu Yu-Cheng;Chang Chia-Yuan

The home-made Shack-Hartmann wavefront sensor (SHWS) returns the coefficients of 8 primary Zernike modes representing the optical aberrations. Based on the identified model of the deformable mirror in the adaptive optics system (AOS), we implement optimized digital controller to rapidly compensate the aberrations and restore the laser focusing spot quality.

11:45 - 12:15 Manuscript ID.  0838
Paper No.  2020-SAT-S0504-I001
Invited Speaker:
Yasuhiro Awatsuji

Ultrafast motion picture of light propagation recorded by holography using a femtosecond pulsed laser
Yasuhiro Awatsuji

The authors present holographic recording of slow-motion pictures of light propagation. The motion picture of not only 2D image but also 3D image of light propagation with the temporal resolution of 96 femtoseconds are demonstrated.