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You searched for subject:(microlensed). Showing records 1 – 3 of 3 total matches.

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NSYSU

1. Chen, Jian-Li. Direct Near-Field Phase Measurements of Fiber Employing a Single-Mode Fiber Interferometer.

Degree: Master, Electro-Optical Engineering, 2013, NSYSU

In order to understand the coupling mechanism between hyperboloid microlensed fiber (HMF) and 980nm pumping laser, the phase distribution and intensity distribution of propagating beam from HMF were measured. A single mode fiber interferometer was employed to measure the phase distribution of the HMF and a CCD with photodetector was employed to measure the intensity distribution of HMF along the Z-axis. A good understanding of the near-field phase and intensity distributions of laser and fiber are essential for micro-optic designs with better mode matching to achieve efficient coupling between lasers to fibers. The wavefront distribution was measured by analyzing interference fringes generated from the reference beam and the measured beam. According to the measured results, the wavefront of the HMF is curved and there was a focal particular plane at z = 10μm. The wavefront inverted as the wavefront propagated through the particular plane. For the intensity distribution of propagating beam through HMF, a CCD with photodetector was employed to investigate the variation of the beam spot profile. The mode field of HMF was a longitudinal ellipse in the far field. As we calculated intensity distribution of z < 50μm, it could be found the mode field distribution at z = 10-μm had a circular shape with a radius of 2.2 μm. These results indicated the consistency between the measured wavefront radius of curvatures and intensity distribution of lensed fiber at 10 μm along the z axis. The results show that the mode matching of wavefront and spot size for laser diode and lensed fiber in the near-field region. This study may provide an essential method for the wavefront distributions of hyperboloid microlensed fiber measurement. Keywords: 980 nm pumping laser, hyperboloid microlensed fiber, interferometer, mode field Advisors/Committee Members: Wen-chi Hung (chair), Ying-Chien Tsai (chair), Wood-Hi Cheng (committee member), Yi-Cheng Hsu (chair), Yi-Chung Huang (chair).

Subjects/Keywords: 980 nm pumping laser; interferometer; hyperboloid microlensed fiber; mode field

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chen, J. (2013). Direct Near-Field Phase Measurements of Fiber Employing a Single-Mode Fiber Interferometer. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719113-105458

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Chen, Jian-Li. “Direct Near-Field Phase Measurements of Fiber Employing a Single-Mode Fiber Interferometer.” 2013. Thesis, NSYSU. Accessed January 22, 2020. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719113-105458.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Chen, Jian-Li. “Direct Near-Field Phase Measurements of Fiber Employing a Single-Mode Fiber Interferometer.” 2013. Web. 22 Jan 2020.

Vancouver:

Chen J. Direct Near-Field Phase Measurements of Fiber Employing a Single-Mode Fiber Interferometer. [Internet] [Thesis]. NSYSU; 2013. [cited 2020 Jan 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719113-105458.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen J. Direct Near-Field Phase Measurements of Fiber Employing a Single-Mode Fiber Interferometer. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719113-105458

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


NSYSU

2. Lei, Szu-chin. Precision Mechanical Grinding Integrated with Spin-on-Glass Electrostatic Pulling Method for Producing Micro-hyperboloid Lensed Optical Fibers.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2016, NSYSU

A novel approach is presented for producing hyperboloid microlens structure directly on an optical single-mode fiber for enhancing the coupling efficiency between high-power laser diodes and single-mode fiber. The hyperboloid lens structure was directly produced with a flat-end single-mode fiber with the core diameter of 6.6 μm. The production has three-step process, including a precision mechanical grinding, a spin-on-glass coating and an electrostatic pulling process. After a single-mode fiber was grinded into hyperboloid shape, trace amount of spin-on-glass is attached to the grinded fiber tip and then an electrostatic pulling is used to adjust the radius of curvature of around 4-5 μm for the single-mode fiber endface. The hyperboloid microlens structure is manufactured for matching with the rectangular outlet of the semiconductor laser diode. A high average coupling efficiency around 81% is obtained, and highest reaches 86.42% for 20 produced lensed fibers. While using the produced hyperboloid fibers, which is doubled efficiency compared to the flat end fiber. The approach was saving time with a simple way of making a microlens structure, so that we testing the micorlenses stability to confirm the feasibility. The coupling stability in five minutes for 5 individual hyperboloid fibers not more than 0.17%, express the good stability for the produced hyperboloid microlensed fibers. Unlike previous with melting or other processes to forming a microlens structure, this method does not damage the fiber endface and can be re-produced. So that, the developed method provides a solution for producing hyperboloid microlensed fibers for high performance coupling between the single mode fiber and the semiconductor diode laser. Advisors/Committee Members: Ying-Chien Tsai (chair), Che-Hsin Lin (committee member), Wood-Hi Cheng (chair), Yi-Cheng Hsu (chair), Chin-Ping Yu (chair).

Subjects/Keywords: coupling efficiency; radius of curvature; microlensed; spin-on-glass; single-mode fiber; electrostatic pulling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lei, S. (2016). Precision Mechanical Grinding Integrated with Spin-on-Glass Electrostatic Pulling Method for Producing Micro-hyperboloid Lensed Optical Fibers. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0620116-231528

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Lei, Szu-chin. “Precision Mechanical Grinding Integrated with Spin-on-Glass Electrostatic Pulling Method for Producing Micro-hyperboloid Lensed Optical Fibers.” 2016. Thesis, NSYSU. Accessed January 22, 2020. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0620116-231528.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Lei, Szu-chin. “Precision Mechanical Grinding Integrated with Spin-on-Glass Electrostatic Pulling Method for Producing Micro-hyperboloid Lensed Optical Fibers.” 2016. Web. 22 Jan 2020.

Vancouver:

Lei S. Precision Mechanical Grinding Integrated with Spin-on-Glass Electrostatic Pulling Method for Producing Micro-hyperboloid Lensed Optical Fibers. [Internet] [Thesis]. NSYSU; 2016. [cited 2020 Jan 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0620116-231528.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lei S. Precision Mechanical Grinding Integrated with Spin-on-Glass Electrostatic Pulling Method for Producing Micro-hyperboloid Lensed Optical Fibers. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0620116-231528

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of St. Andrews

3. Ma, Nan. Tailoring optical fibers for cell transfection .

Degree: 2012, University of St. Andrews

Optical transfection is a promising technique for the delivery of foreign genetic material into cells by transiently changing the permeability of the cell membrane. Of the different optical light sources that have been used, femtosecond laser based transfection has been one of the most effective methods for optical transfection, which is generally implemented using a free-space bulk optical setup. Here in this thesis, a few novel fabrication methods are devised to obtain easy and inexpensive fabrication of microlensed optical fibers, which can be used to replace traditional optical setups and perform femtosecond optical transfection. These fabrication methods offer the flexibility to fabricate a microlens which can focus femtosecond laser pulses at 800 nm to a small focal spot whilst keeping a relatively large working distance. In conventional optical transfection methods the foreign genetic material to be transfected is homogenously mixed in the medium. This thesis reports the first realization of an integrated optical transfection system which can achieve transfection along with localized drug delivery by combining lensed fiber based optical transfection system with a micro-capillary based microfluidic system. Finally, based on an imaging fiber, (coherent optical fiber bundle), the first endoscope-like integrated system for optical transfection with subcellular resolution epifluorescence imaging was built. The transfection efficiency of these fiber based systems is comparable to that of a standard free-space transfection system. Also the use of an integrated system for localized gene delivery resulted in a reduction of the required amount of genetic material for transfection. The miniaturized, integrated design opens a range of exciting experimental possibilities, such as the dosing of tissue slices to study neuron activities, targeted drug delivery, and in particular for using endoscope-like integrated systems for targeted in vivo optical microsurgery. Advisors/Committee Members: Dholakia, Kishan (advisor), Gunn-Moore, Frank J (advisor).

Subjects/Keywords: Optical transfection; Photoporation; Femtosecond laser; Microlensed optical fiber; Microfluidic; Micro-endoscopy; Optical microsurgery

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ma, N. (2012). Tailoring optical fibers for cell transfection . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/3177

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Ma, Nan. “Tailoring optical fibers for cell transfection .” 2012. Thesis, University of St. Andrews. Accessed January 22, 2020. http://hdl.handle.net/10023/3177.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ma, Nan. “Tailoring optical fibers for cell transfection .” 2012. Web. 22 Jan 2020.

Vancouver:

Ma N. Tailoring optical fibers for cell transfection . [Internet] [Thesis]. University of St. Andrews; 2012. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/10023/3177.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ma N. Tailoring optical fibers for cell transfection . [Thesis]. University of St. Andrews; 2012. Available from: http://hdl.handle.net/10023/3177

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.