Advanced Optowave Corporation

Saint Bonaventure, NY, United States

Advanced Optowave Corporation

Saint Bonaventure, NY, United States

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Patent
Advanced Optowave Corporation | Date: 2016-11-29

A multipass fiber amplifier comprises a micro-optic-module polarization separating device including a first ASE blocking device, a micro-optic-module 90 polarization rotating reflector including a second ASE blocking device, a pump source for providing pump light; a micro-optic-module wavelength-division multiplexer (WDM) for combining the pump light and the laser beam; and a gain fiber having a first end and a second end for amplifying the laser beam using the pump light, where the first ASE blocking device is coupled to the first end of the gain fiber and the second ASE blocking device is coupled to the second end of the gain fiber.


Dabir-Moghaddam N.,Illinois Institute of Technology | Tao S.,Advanced Optowave Corporation | Wu B.,Illinois Institute of Technology | Wu B.,Purdue University | Shin Y.C.,Purdue University
Procedia Manufacturing | Year: 2016

Microholes with diameters varying with the hole depth have promising applications in important applications, but their manufacturing is difficult when the diameter of the hole is very small and/or varies complicatedly with the depth. In the authors’ previous work (Dabir-Moghaddam et al., 2016), physics-based modeling study has been carried out on the interaction of a short laser pulse with a plasma plume that pre-exists in a microhole and the resulted effect on the sidewall of the hole. The model calculations have implied that a novel dual-pulse laser ablation and plasma amplification (LAPA) technique is potentially feasible for drilling microholes with diameters that are different at different hole depths. In this paper, further model calculations have been performed to study the effect of different initial plasma temperatures. Under the studied conditions, it has been found that laser amplification of a plasma plume with a higher initial temperature can lead to a larger heat flux to the hole sidewall surface and a larger surface vaporization depth in the sidewall, which indicates that more significant material removal will be expected. On the other hand, a lower initial plasma temperature can lead to more non-uniform vaporization depths at different sidewall locations, indicating that a spatially more selective material removal will be expected. © 2016


Patent
Advanced Optowave Corporation | Date: 2015-10-21

A fiber laser oscillator comprises an active fiber for providing a lasing light having a selected wavelength band, a saturable absorber assembly coupled to a first end of the active fiber, a pump source for providing a pump light having wavelengths except the selected wavelength band, an optical component coupled to the second end of the active fiber and the pump source. The optical component comprises a thin film filter for transmitting the lasing light for a first time and reflecting the pump light and a reflector for reflecting the lasing light transmitted for the first time through the thin film filter. The lasing light reflected by the reflector transmits through the thin film filter for a second time and overlaps with the pump light reflected by the thin film filter.


Zhang Z.,Southwest University | Liu Y.,Advanced Optowave Corporation | Xiong Z.,Southwest University
Plasmonics | Year: 2011

The transverse mode electron oscillations contribute to most of the surface-enhanced Raman scattering (SERS) intensity from the nanorod array substrates. To enhance the transverse mode electron oscillation and improve the SERS enhancements, the local electric field distribution of the orthogonal-nanorod structures, composed of two parallel horizontal nanorods in between two parallel vertical nanorods, has been studied. The local electric fields of the longitudinal mode along the horizontal nanorods act as the excitation for the transverse mode electron oscillations in vertical nanorods, leading to the cascade enhancements of the electric fields around the vertical nanorods. In addition, the plasmon peaks of the longitudinal modes can be tuned by changing the lengths and the widths of the horizontal nanorods and the separations between horizontal and vertical nanorods. These results would be much helpful to engineer SERS substrates to obtain larger SERS enhancements. © 2010 Springer Science+Business Media, LLC.


Dabir-Moghaddam N.,Illinois Institute of Technology | Tao S.,Advanced Optowave Corporation | Wu B.,Illinois Institute of Technology | Wu B.,Purdue University | Shin Y.C.,Purdue University
Manufacturing Letters | Year: 2016

Microholes with varying diameters at different depths are very desirable in various important applications. However, it is very challenging to produce microholes with varying diameters when the variation is in a complicated way and/or when the hole diameter is very small. This paper presents physics-based modeling work on the interactions among a picosecond (ps) laser pulse, a pre-existing plasma plume inside a microhole, and the hole sidewall. The modeling work implies the potential feasibility of a novel dual-pulse laser ablation and plasma amplification (LAPA) process for drilling microholes with varying diameters at different depths. © 2015 Society of Manufacturing Engineers (SME).


Tao S.,Advanced Optowave Corporation | Wu B.,Illinois Institute of Technology
Applied Surface Science | Year: 2014

Recent experiments in the literature have observed Coulomb explosion (CE) in metals under femtosecond (fs) laser irradiation. This is different from the previous common belief that CE will be strongly inhibited in metals due to the existence of a large number of free electrons with good mobility and the associated screening effect. It is still not well understood why CE can occur in metals. CE requires a sufficiently high outwards pointing electric field in the metal near-surface region. Using a physics-based model, this study shows that during the early stage of fs laser-metal interactions, the emitted electrons due to fs laser irradiation are still very close to the metal target surface, whose effects also need to be considered. The emitted electrons will generate an additional outwards pointing electric field in the target near-surface region, and will also exert a repulsive force on the electrons flowing from the deeper region of the target towards its surface. These effects are helpful to the development of a large outwards pointing electric field in the target near-surface region. The model calculation considering the effects of emitted electrons shows that the electric field at around the target surface can exceed the CE threshold under the studied conditions. The study has provided a physical explanation for why CE can occur in metals under fs laser irradiation. © 2014 Elsevier B.V.


Ye C.,Purdue University | Cheng G.J.,Purdue University | Tao S.,Advanced Optowave Corporation | Wu B.,Illinois Institute of Technology
Journal of Manufacturing Science and Engineering, Transactions of the ASME | Year: 2013

A magnetic field-assisted laser drilling process has been studied, where nanosecond laser ablation is performed under an external magnetic field. The study shows that the magnetic field-assisted laser drilling process produces deeper drilling depth and generates more confined plasma plume and relative less residual, as compared with laser drilling without magnetic field. This phenomenon has been rarely reported in the literature. The magnetic field effects on laser ablation have been analyzed analytically and a hypothesized explanation has been proposed based on the effect of the magnetic field on the plasma produced during laser ablation. Copyright © 2013 by ASME.


Zhou Y.,Electro Scientific Industries Inc. | Gao Y.,Illinois Institute of Technology | Wu B.,Illinois Institute of Technology | Tao S.,Advanced Optowave Corporation | Liu Z.,Illinois Institute of Technology
Journal of Manufacturing Science and Engineering, Transactions of the ASME | Year: 2014

This paper presents an interesting nanosecond (ns) laser-induced plasma deburring (LPD) effect (from microchannel sidewalls) discovered by the authors, which has been rarely reported before in the literature. Fast imagining study has been performed on plasma produced by ns laser ablation of the bottom of microchannels. It has been found that the plasma can effectively remove burrs from the sidewall of the channels, while on the other hand microscopic images taken in this study did not show any obvious size or shape change of the channel sidewall after LPD. LPD using a sacrifice plate has also been studied, where the plasma for deburring is generated by laser ablation of the sacrifice plate instead of the workpiece. The observed laser-induced plasma deburring effect has several potential advantages in practical micromanufacturing applications, such as high spatial resolution, noncontact and no tool wear, and less possibility of damaging or overmachining useful microfeatures when removing burrs from them. The fundamental mechanisms for the observed laser-induced plasma deburring effect still require lots of further work to completely understand, which may include mechanical breaking of burrs due to high kinetic energies carried by plasma and the associated shock wave, and/or thermal transport from plasma to burrs that may cause their heating and phase change, or other mechanisms. Copyright © 2014 by ASME.


Patent
Advanced Optowave Corporation | Date: 2014-04-04

An apparatus and method for multipass fiber amplifier comprises: (a) first passing a laser beam having a first linear polarization in the fiber amplifier in a first direction, (b) rotating the first linear polarization of the laser beam to a second linear polarization, the second linear polarization is perpendicular to the first linear polarization, (c) second passing the laser beam having the second linear polarization in the fiber amplifier in a second direction, the second direction is opposite to the first direction, (d) third passing the laser beam having the second linear polarization in the fiber amplifier in the first direction, the laser beam having the second linear polarization is reflected by a polarization separating device and a mirror, (e) rotating the second linear polarization of the laser beam to the first linear polarization, and (f) fourth passing the laser beam having the first linear polarization in the fiber amplifier in the second direction.


Patent
Advanced Optowave Corporation | Date: 2015-03-18

A fiber coupled modular laser system comprises a laser oscillator, at least one fiber pre-amplifier, and at least one free space solid state power amplifier. The output of the laser oscillator is fiber coupled with the input of the at least one fiber pre-amplifier or the at least one free space solid state power amplifier. The output or the input of the at least one fiber pre-amplifier is fiber coupled with the input or the output of the at least one free space solid state power amplifier.

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