The University of Arizona

Canon Kabushiki Kaisha

Harvard College

Cornell University

Tipd, LLC

Khanh Kieu

Nasser N Peyghambarian

Christian W Freudiger

Dan Fu

Xiaoliang Sunney Xie

Yukihiro Inoue

Robert Andrew Norwood

Frank Wise

Yushi Kaneda

Roland Himmelhuber

Takefumi Ota

Dan Trung Nguyen

Lloyd J LaComb, Jr

Xiaoling Sunney Xie

Yukun Qin, I

Thanh Nam Nguyen

Dmitry Churin

Laser sources of the present invention allow for the efficient generation of harmonic frequencies from broadband sources. Over-compression and under-compression of a split signal result in two beams chirped in opposite directions. These two beams may be combined in a non-linear crystal to generate a narrow-band harmonic signal from a broadband source.

Laser generation apparatus and sources using the same

A method of performing coherent anti-stokes Raman spectroscopy (CARS) includes generating first and second optical pulse trains having different and adjustable repetition rates. One of the pulse trains is directed in a CW direction and the other in a CCW direction. A frequency shift and a first linear chirp is applied to optical pulses in the first optical pulse train. A second linear chirp is applied to optical pulses in the second optical pulse train. The first and second linear chirps having a common chirp rate. One of the chirped optical pulse trains is used as a pump beam and the other is used as a Stokes beam. The first and second chirped optical pulse trains are combined to define a combined beam. The combined beam is provided to a CARS spectroscopic system for exciting a resonant mode in a sample and generating a CARS signal.

All-fiber single-cavity dual-comb for coherent anti-stokes Raman scattering spectroscopy based on spectral focusing

A pumped optical ring laser sensor such as a gyroscope includes a pulsed laser source to generate optical pump pulses and a synchronously pumped ring laser. The ring laser is optically pumped by first optical pump pulses from the pulsed laser source that are directed in a clock-wise (CW) direction through the ring laser and by second optical pump pulses from the pulsed laser source that are directed in a counter-clock wise (CCW) direction through the ring laser. The ring laser has an optical resonator that includes a gain medium for producing CW and CCW frequency-shifted pulses from the first and second optical pump pulses. The ring laser further includes a port for receiving the first and second pump pulses and for extracting the CW and CCW frequency-shifted pulses from the ring laser such that the frequency-shifted pulses overlap in time after being extracted to generate a beatnote.

All-fiber bidirectional synchronously pumped ultrafast ring oscillator for precision sensing

A method of interrogating an absorbing sample includes using a mode-locked laser mode-locked in both a clock-wise (CW) and a counter-clock wise (CCW) direction to generate first and second optical pulses having different repetition rates. One of the first and second optical pulses is directed in a CW direction and the other of the first and second optical pulses is directed in the CCW direction. The first optical pulses are transmitted through the absorbing sample to probe the absorbing sample while the second optical pulses are transmitted through the absorbing sample to act as a local oscillator. An interference pattern produced by interference between the first and second optical pulses is detected after traversing the absorbing sample.

Dual-comb spectroscopy with a free-running bidirectionally mode-locked fiber laser

An optical apparatus that includes an optical source that generates a first optical pulse with a first optical wavelength. The optical apparatus also includes an optical amplifier that outputs an amplified pulse. The optical apparatus also includes a first waveguide that is connected to the optical amplifier and a second waveguide. Wherein the second waveguide converts the energy of the amplified pulse into energy of a second pulse that has a second optical wavelength different from the first optical wavelength. Wherein, the following equation is satisfied: L_min&#x2266;L&#x2266;&#x3c0;/&#x3b3;P. In which a length of the first waveguide is L, a nonlinear coefficient of the first waveguide is &#x3b3;, a peak power of the amplified pulse as it is received by the first waveguide is P, and a minimum length of the first waveguide is L_min or L is equal to zero.

High efficiency fiber optical parametric oscillator

Probe beams are scanned with respect to waveguide substrates to generate optical harmonics. Detection of the optical harmonic radiation is used to image waveguide cores, claddings, or other structures such as electrodes. The detected optical radiation can also be used to provide estimates of linear electrooptic coefficients, or ratios of linear electrooptic coefficients. In some cases, the poling of polymer waveguide structures is monitored during fabrication based on a second harmonic of the probe beam. In some examples, third harmonic generation is used for imaging of conductive layers.

SHG imaging technique for assessing hybrid EO polymer/silicon photonic integrated circuits

An illumination system is disclosed for providing dual excitation wavelength illumination for non-linear optical microscopy and micro-spectroscopy. The illumination system includes a laser system for providing a first train of pulses at a center optical frequency &#x3c9;, a frequency converting system for providing at least a second train of pulses at a center optical frequency &#x3c9;and a third train of pulses at a center optical frequency &#x3c9;, where &#x3c9;is different from &#x3c9;and &#x3c9;responsive to the first train of pulses, an amplifier system for amplifying the second train of pulses to provide an amplified second train of pulses, and an adjustment means for adjusting a time delay between the amplified second train of pulses and the third train of pulses for the dual-excitation wavelength illumination.

Laser illumination systems and methods for dual-excitation wavelength non-linear optical microscopy and micro-spectroscopy systems

An optical apparatus comprising: a source and a loop. The source generates a pump. The resonating cavity of the source includes: a gain medium; and a tunable filter for selecting a wavelength. The loop comprises: an input coupler; a waveguide; and an output coupler. The input coupler receives the pump and a signal and outputs the pump and the signal into the waveguide In the waveguide, energy in the pump is transferred into energy in the signal while a relative center position of the signal is crossing a center position of the pump in a first direction while both are passing through the waveguide and into the output coupler. The output coupler r outputs a first portion of the signal and a second portion of the signal is fed into the input coupler as the signal, completing the loop.

Stable, high efficiency, wavelength tunable fiber optic parametric oscillator

A fiber optic parametric amplifier that includes a resonating cavity. The resonating cavity includes linear fiber optic gain medium, with negative chromatic dispersion; and a nonlinear fiber optic gain medium with positive chromatic dispersion.

Dissipative soliton mode fiber based optical parametric oscillator

An illumination system is disclosed for providing dual-excitation wavelength illumination for non-linear optical microscopy and micro-spectroscopy. The illumination system includes a laser system, an optical splitting means, a frequency shifting system, and a picosecond amplifier system. The laser system includes a laser for providing a first train of pulses at a center optical frequency &#x3c9;. The optical splitting means divides the first train of pulses at the center optical frequency &#x3c9;into two trains of pulses. The frequency shifting system shifts the optical frequency of one of the two trains of pulses to provide a frequency shifted train of pulses. The picosecond amplifier system amplifies the frequency shifted train of pulses to provide an amplified frequency-shifted train of pulses having a pulse duration of at least 0.5 picoseconds.

A saturable absorber (SA) is constructed using a fiber taper embedded in a carbon nanotube/polymer composite. A fiber taper is made by heating and pulling a small part of standard optical fiber. At the taper's waist light is guided by the glass-air interface, with an evanescent field protruding out of the taper. Carbon nanotubes mixed with an appropriate polymer host material are then wrapped around the fiber taper to interact with the evanescent field. Saturable absorption is possible due to the unique optical properties of the carbon nanotubes. The device can be used in mode-locked lasers where it initiates and stabilizes the pulses circulating around the laser cavity. The SA can be used in various laser cavities, and can enable different pulse evolutions such as solitons, self-similar pulses and dissipative solitons. Other applications include but are not limited to optical switching, pulse cleanup and pulse compression.

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Tucson, AZ, United States of America

Khanh Kieu