Dr. Tiancheng Huo Profile

Dr. Tiancheng Huo

at Beckman Laser Institute and Medical Clinic

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Author

Publications (13)

Proceedings Article | 10 March 2020 Presentation

Fast measurement of reflection matrix for deep imaging in highly scattering media based on optical coherence tomography (Conference Presentation)

Jing Cao, Qiang Yang, Yusi Miao, Tiancheng Huo, Yan Li, Youmin He, Jiang Zhu, Zhongping Chen

Proceedings Volume 11253, 112530H (2020) https://doi.org/10.1117/12.2545511

KEYWORDS: Optical coherence tomography, Scattering media, Light scattering, Biomedical optics, Scattering, Phase shifts, Multiple scattering, Tissue optics, Reconstruction algorithms, Image restoration

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Proceedings Article | 9 March 2020 Presentation

Full-vectorial characterization of complex femtosecond laser pulses (Conference Presentation)

Tiancheng Huo, Li Qi, Yusi Miao, Yan Li, Zhongping Chen

Proceedings Volume 11270, 112700J (2020) https://doi.org/10.1117/12.2547002

KEYWORDS: Femtosecond phenomena, Polarization, Electroluminescent displays, 3D metrology, Interferometers, Charge-coupled devices, Optical filters, Light wave propagation, Pulsed laser operation, Free space

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Proceedings Article | 13 March 2019 Presentation

Multidimensional structures of intrinsically controlled complex laser pulses (Conference Presentation)

Tiancheng Huo, Li Qi, Yusi Miao, Zhonglie Piao, Buyun Zhang, Yan Li, Zhongping Chen

Proceedings Volume 10897, 108971K (2019) https://doi.org/10.1117/12.2510800

KEYWORDS: Fiber lasers, Pulsed laser operation, Polarization, Multimode fibers, Femtosecond phenomena, Electroluminescent displays, 3D metrology, Interferometers, Paraxial approximations, Light wave propagation

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Laser pulses in either laboratory or industry are typically complex objects. Unlike the classical electro-magnetic wave with uniform polarization distribution along the flat wave-front or a general vector beam under the paraxial approximation, the real light pulses, such as the pulses from the high power multimode fiber laser and the dechirped femtosecond pulses with structured wave-front, spectrum and polarization distributions, usually have non-vanishing component in the propagation direction. Therefore, the description of a general vectorial laser pulse should be implemented in multi-dimensional way, for the light is the combination of a three-dimensional(3D) vector field (electric ﬁeld E) and a 3D pseudovector field (magnetic ﬁeld B) in the 3D Euclidean space (R3). Here we report on a novel technique for the multi-dimensional characterization which includes the spatiotemporal amplitude and phase information as well as the vectorial features in 3D Euclidean space of the complex laser pulses, such as the intrinsically controlled femtosecond pulses with higher-order Poincaré sphere beams and vectoral spherical beams. A two-steps-based polarization-sensitive Mach–Zehnder interferometer temporal scan technique was used, at the first time, to capture the complete information of the pulses. The corresponding measurement device, placed on the collimated and attenuated beam at the laser output is consists of a special Mach–Zehnder interferometer, a polarizing beam-splitter and charge-coupled device (CCD) cameras. The reference beam with vertical and horizontal polarization is exported from the cavity and attenuated to a suitable intensity by using a neutral-density filter. After 3D phase unwrapping, removal of the reference curvature, correction of achromatic wave-front distortions, spectral phase and amplitude reconstructions, as well as the measurement for the intrinsic phase of the reference pulse, the complete information of the pulse, include the phase information of the three electronic components, will be obtained. This new measurement capability opens the way to in-depth characterizations and optimizations of the complex laser pulses and ultimately to the study of new phenomena of multimode fiber laser generated laser pulse as well as the interactions between materials and structured ultra-short laser beams.

Proceedings Article | 4 March 2019 Presentation

Polarization-sensitive optical coherence tomography based on a spun fiber (Conference Presentation)

Junxiao Yu, Sucbei Moon, Zhongping Chen, Jiang Zhu, Tiancheng Huo

Proceedings Volume 10867, 1086711 (2019) https://doi.org/10.1117/12.2511567

KEYWORDS: Optical coherence tomography, Polarization, Structured optical fibers, Free space optics, Singular optics, Systems modeling, Endoscopy, Statistical analysis, Backscatter, Free space

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Proceedings Article | 14 March 2018 Presentation

Femtosecond laser with intracavity controlled higher-order Poincaré sphere beams and total E-field reconstruction of the pulses (Conference Presentation)

Tiancheng Huo, Li Qi, Yusi Miao, Zhonglie Piao, Buyun Zhang, Jiang Zhu, Yan Li, Zhongping Chen

Proceedings Volume 10549, 105490G (2018) https://doi.org/10.1117/12.2289365

KEYWORDS: Femtosecond phenomena, Polarization, Poincaré sphere, Interferometers, Mode locking, Optical filters, Superposition, Light sources, Fiber lasers, Diffraction gratings

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Light carries both spin and orbital angular momentum and the superpositions of these two dynamical properties have found many applications. Many techniques exist to create such light sources but none allow their creation at the femtosecond laser. Here we report on a novel mode-locked ytterbium-doped fiber laser that generates femtosecond pulses with higher-order Poincaré sphere beams. The controlled generation of such pulses such as azimuthally and radially polarized light with definite orbital angular momentum modes are demonstrated. A unidirectional ring cavity constructed with the Yb-doped fiber placed at the end of the fiber section to reduces unnecessary nonlinear effects is employed for self-starting operation. Two pairs of diffraction gratings are used for compensating the normal group velocity dispersion of the fiber and other elements. Mode-locked operation is achieved based on nonlinear polarization evolution, which is mainly implemented with the single mode fiber, the bulk wave plates and the variable spiral plates (q-plate with topological charge q=0.5). The conversion from spin angular momentum to the OAM and reverse inside the laser cavity are realized by means of a quarter-wave plate and a q-plate so that the polarization control was mapped to OAM mode control. To demonstrate the total spatiotemporal and vectoral characterization of the new type femtosecond laser beams, here, a polarization-sensitive Mach–Zehnder interferometer temporal scan technique was used, at the first time, to capture the complete information of the pulse. The corresponding measurement device, placed on the collimated and attenuated beam at the laser output and simply consists of a special Mach–Zehnder interferometer, a polarizing beam-splitter and two charge-coupled device (CCD) cameras. The reference beam with vertical polarization is exported from the cavity and attenuated to a suitable intensity by using a neutral-density filter. After Fourier filtering, removal of the reference curvature, correction of achromatic wave-front distortions, spectral phase and amplitude reconstructions, as well as the measurement for the intrinsic phase of the reference pulse, the complete information of the pulse will be obtained. This new measurement capability opens the way to in-depth characterization and optimization of the vector vortex femtosecond laser pulse and ultimately to the detection of new phenomena of the interactions between materials and structured femtosecond laser beams in space–time and polarization.

Proceedings Article | 21 April 2017 Presentation

A femtosecond Yb-doped fiber laser with generalized vector vortex beams output (Conference Presentation)

Tiancheng Huo, Li Qi, Buyun Zhang, Zhongping Chen

Proceedings Volume 10083, 100831Z (2017) https://doi.org/10.1117/12.2251498

KEYWORDS: Dispersion, Single mode fibers, Fiber lasers, Femtosecond phenomena, Femtosecond fiber lasers, Polarization, Mode locking, Superposition, Light sources, Diffraction gratings

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Proceedings Article | 19 April 2017 Presentation

Quantitative angle-independent flow measurement using relative standard deviation OCT (Conference Presentation)

Buyun Zhang, Jiang Zhu, Li Qi, Yiwei Gao, Tiancheng Huo, Zhuqing Zhu, Zhongping Chen

Proceedings Volume 10053, 1005312 (2017) https://doi.org/10.1117/12.2251000

KEYWORDS: Medical laser equipment, Laser processing, Lithium, Optical coherence tomography, Velocity measurements, Doppler tomography, Data processing, Calibration, Coherence (optics), Biomedical optics

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SPIE Journal Paper | 24 March 2015 Open Access

Ultrahigh-speed optical coherence tomography utilizing all-optical 40 MHz swept-source

Tiancheng Huo, Chengming Wang, Xiao Zhang, Tianyuan Chen, Wenchao Liao, Wenxin Zhang, Shengnan Ai, Jui-Cheng Hsieh, Ping Xue

JBO, Vol. 20, Issue 03, 030503, (March 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.3.030503

KEYWORDS: Optical coherence tomography, Optical amplifiers, Dispersion, Point spread functions, Solids, Laser optics, Tissue optics, Fiber Bragg gratings, Tissues, Picosecond phenomena

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SPIE Journal Paper | 1 August 2013 Open Access

Tiny endoscopic optical coherence tomography probe driven by a miniaturized hollow ultrasonic motor

Tianyuan Chen, Ning Zhang, Tiancheng Huo, Chengming Wang, Jing-gao Zheng, Tieying Zhou, Ping Xue

JBO, Vol. 18, Issue 08, 086011, (August 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.8.086011

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SPIE Journal Paper | 9 May 2013 Open Access

Noninvasive three-dimensional live imaging methodology for the spindles at meiosis and mitosis

Jing-gao Zheng, Tiancheng Huo, Ning Tian, Tianyuan Chen, Chengming Wang, Ning Zhang, Fengying Zhao, Danyu Lu, Wanyun Ma, Jia-Lin Sun, Ping Xue, Dieyan Chen

JBO, Vol. 18, Issue 05, 050505, (May 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.5.050505

KEYWORDS: Spindles, 3D image processing, Optical coherence tomography, Scattering, Microscopes, Stereoscopy, Visualization, Sun, Spatial resolution, Confocal microscopy

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Proceedings Article | 20 March 2013 Paper

Ultrahigh resolution endoscopic spectral domain optical coherence tomography with a tiny rotary probe driven by a hollow ultrasonic motor

Ning Zhang, Tianyuan Chen, Tiancheng Huo, Chengming Wang, Jing-gao Zheng, Tieying Zhou, Ping Xue

Proceedings Volume 8571, 85713A (2013) https://doi.org/10.1117/12.2001829

KEYWORDS: Endoscopy, Optical coherence tomography, Ultrasonics, Objectives, Signal to noise ratio, Spectral resolution, Prisms, Image resolution, Point spread functions, GRIN lenses

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SPIE Journal Paper | 13 December 2012 Open Access

Understanding three-dimensional spatial relationship between the mouse second polar body and first cleavage plane with full-field optical coherence tomography

Jing-gao Zheng, Tiancheng Huo, Tianyuan Chen, Chengming Wang, Ning Zhang, Ning Tian, Fengying Zhao, Dieyan Chen, Wanyun Ma, Jia-Lin Sun, Ping Xue, Danyu Lu

JBO, Vol. 18, Issue 01, 010503, (December 2012) https://doi.org/10.1117/12.10.1117/1.JBO.18.1.010503

KEYWORDS: 3D image processing, Optical lithography, Optical coherence tomography, 3D modeling, Stereoscopy, Microscopes, Sun, Biology, Lutetium, Physics

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SPIE Journal Paper | 28 June 2012 Open Access

Label-free subcellular 3D live imaging of preimplantation mouse embryos with full-field optical coherence tomography

Jing-gao Zheng, Tianyuan Chen, Chengming Wang, Ning Tian, Fengying Zhao, Tiancheng Huo, Ning Zhang, Dieyan Chen, Wanyun Ma, Jia-Lin Sun, Ping Xue, Danyu Lu

JBO, Vol. 17, Issue 7, 070503, (June 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.7.070503

KEYWORDS: 3D image processing, Optical lithography, Stereoscopy, 3D modeling, Optical coherence tomography, Microscopes, Biology, Imaging systems, Image processing, 3D metrology

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