319 results about "Supercontinuum" patented technology

A method of spectrally broadening light pulses includes the steps of providing the light pulses with a laser source, said light pulses having a pulse duration below 1 ps, in-coupling the light pulses into a hollow optical waveguide device, and spectrally broadening the light pulses propagating along the pulse guiding medium by subjecting them to a Raman nonlinearity via excitation of a Raman polarization having a first Raman period, wherein the optical waveguide device subjects the light pulses to anomalous group velocity dispersion which combines with the spectral broadening of the light pulses to result in a Raman-enhanced self-compression of the light pulses, and the light pulses further propagate along the optical waveguide device such that the Raman-enhanced self compression results in a further excitation of a Raman polarization having a second Raman period which is faster than the first Raman period.

An optical pulse source comprising a DPSS pump laser, a photonic crystal fiber (PCF), and acousto-optic modulator (AOM) gating device is disclosed. The pump pulses are coupled through lenses to the AOM gating device, which is synchronized to the pump laser and is operable to gate the pump pulses to a reduced repetition rate Rr=Rf/N, where Rf is the pump laser fundamental frequency. The pulses from the AOM are injected via optics into the PCF. Propagation through the PCF causes the pulses to broaden spectrally to produce optical supercontinuum pulses. An optical pulse source that further includes an acousto-optical tunable filter (AOTF) operable to convert the optical supercontinuum pulses into wavelength variable output pulses is also provided. A method of scaling the energy of the optical supercontinuum pulses is also disclosed.

Coherent and compact supercontinuum light sources for the mid IR spectral regime are disclosed and exemplary applications thereof. The supercontinuum generation is based on the use of highly nonlinear fibers or waveguides. In at least one embodiment the coherence of the supercontinuum sources is increased using low noise mode locked short pulse sources. Compact supercontinuum light sources can be constructed with the use of passively mode locked fiber or diode lasers. Wavelength tunable sources can be constructed using appropriate optical filters or frequency conversion sections. Highly coherent supercontinuum sources further facilitate coherent detection schemes and can improve the signal/noise ratio in lock in detection schemes.

An apparatus and method for synthesizing waveforms with arbitrary amplitude, frequency, and phase modulation. Pulses from a broadband (supercontinuum) optical source are filtered into a plurality of wavelength channels, and the intensity of each wavelength channel is adjusted to an appropriate level depending on the desired shape of the envelope of the output pulse. The envelope of the sampling wavelength channels can be stretched, compressed, or inverted in the time domain later using a dispersive medium. After time domain manipulation, the optical pulse train is observed with a combination of high-speed photodetectors and a radio frequency low-pass filter, a low-speed photodetector.

Traditional incandescent and halogen lamps produce a high CRI warm white light with indirect emission patterns at the cost of poor energy efficiency. This new advancement in solid-state lighting enables the production of a new solid-state filament wherein the tungsten filament is replaced with an array of high efficiency LED emitters which combine through an equiangular spiral, or t-spline/TNURCC lightpipe network to produce a single homogeneous blue light source which then pumps a luminescent filament comprised of a phosphor loaded silicone, phosphor loaded polymer, a lanthanide doped fluoro-phosphate glass, glass ceramic tape, quantum dot filled composite, or super-continuum spectrum producing photonic crystalline structure.

The present invention relates to frequency rulers. At least one embodiment includes a mode locked pump source operated at pulse repetition rate, and a pump output having a pump carrier envelope offset frequency. A nonlinear optical system outputs a frequency ruler spectrum comprising individual frequency modes. The frequency modes may be characterized by a frequency spacing which is an integer multiple of the repetition rate and by distinct ruler carrier envelope offset frequencies which exhibit at least one discontinuity across the frequency output. The ruler carrier envelope offset frequencies are substantially locked to the carrier envelope offset frequency of the pump laser. One preferred embodiment includes a frequency doubled, doubly resonant, non-degenerate OPO (DNOPO), a supercontinuum generation (SC) stage and at least one reference laser arranged downstream from a Tm fiber-based pump source. A plurality of beat signals generated therefrom provide for stabilization of the system.

Enhancement of the supercontinuum generation performance of a highly-nonlinear optical fiber (HNLF) is accomplished by performing at least one post-processing treatment on the HNLF. Particularly, UV exposure of the HNLF will modify its dispersion and effective area characteristics so as to increase its supercontinuum bandwidth, without resorting to techniques such as tapering or introducing unwanted reflections into the HNLF. The UV exposure can be uniform, slowly varying or aperiodic along the length of the HNLF, where the radiation will modify the nonlinear properties of the HNLF. Various other methods of altering these properties may be used. The output from the HNLF can be monitored and used to control the post-processing operation in order to achieve a set of desired features in the enhanced supercontinuum spectrum.

The invention is applicable to the field of laser detection and provides a coherent anti-Stokes Raman scattering microscopic method and system of a super-diffraction limit. In the method, a spatial resolution of the super-diffraction limit can be obtained through increasing an additional detecting light which is collinearly focused on a sample together with a pump light and a Stokes light at the same time, enabling the additional detecting light to exhaust phonons generated by the pump light and the Stokes light on a periphery of a focal spot so as to form useless CARS (Coherent Anti-Stokes Raman Scattering) signals, enabling photons in accordance with a phase matching condition in the delayed detecting light to hit phonons at a central area of the focal spot so as to form useful CARS signals, and separating the useless CARS signals. Because supercontinuum laser with a broad band is adopted as the pump light and the Stokes light, a complete CARS spectrum signal of a molecule is obtained to image the whole molecule.

A method and an apparatus are provided for producing SuperContinuum (SC) light for medical and biological applications is provided. Pulses are focused from a laser system into at least one of a pressurized cell and one or more fibers. A pump pulse is converted into the SC light at a specified rate of repetition. The SC light is applied at the specified rate of repetition to tissue for medical and biological applications.

Enhancement of the supercontinuum generation performance of a highly-nonlinear optical fiber (HNLF) is accomplished by incorporating at least one Bragg grating structure in the HNLF. The Bragg grating results in reflecting a core-guided signal into signal which also remains core-guided. The supercontinuum radiation generated by such an arrangement will exhibit a substantial peak in its energy at the grating resonance of the Bragg grating and a region of increased radiation in a narrow wavelength band on the long wavelength side of the peak. A number of such Bragg gratings may be formed so as to “tailor” the enhancements provided in the supercontinuum radiation. Various, well-known Bragg grating modifications (tuning, chirped, blazed, etc.) may also be used in the inventive structure to enhance the generated supercontinuum.

A waveguide, such as a holey fiber or other optical fiber, is tapered to control the dispersion in a manner which varies along the length of the tapered portion of the fiber, thus providing the desired characteristics of the fiber. The longitudinal variation of the phase-matching conditions for Cherenkov radiation (CR) and four-wave mixing (FWM) introduced by DMM allow the generation of low-noise supercontinuum. The flexibility of the design permits the designer to control the tapering to select the bandwidth, the center frequency, or both. The holey fiber can be a polarization-maintaining fiber.

An arrangement for generating beat notes with a relatively high signal-to-noise ratio (SNR) utilizes a pulsed laser source coupled into a section of post-processed highly-nonlinear optical fiber (HNLF) to generate a frequency comb having one or more regions of enhanced spectral power. A second laser signal source is overlapped with the frequency comb to form one or more “beat notes” at difference frequencies(y) between the second source and the continuum comb. By virtue of the post-processing, areas of spectral enhancement are formed along the comb, and are positioned to interact with the second laser signal to generate optical beat notes. The second laser signal may be from an external source (forming beat notes from a signal “outside” of the comb), or may be a frequency-multiplied version of the generated supercontinuum (forming beat notes from a signal “within” the comb).

A method and apparatus for providing optical supercontinuum. The method comprises creating a spectrally narrow phase feature within a supercontinuum spectrum produced from a laser pulse that has been subjected to supercontinuum generation, thereby producing a modified supercontinuum spectrum, and propagating the modified supercontinuum spectrum through an optical waveguide that is suitable for supercontinuum generation, thereby further modifying the modified supercontinuum spectrum. The method may include modifying the modified supercontinuum spectrum by increasing its energy in a vicinity of the phase feature.

This invention pertains to a device for broadening optical wavelength in the 2-14 μm region comprising a light source and a highly nonlinear chalcogenide fiber associated therewith whereby a light signal is passed from the light source into the fiber wherein and through interactions between the light signal and the material, bandwidth of the light signal is broadened in the 2-14 μm region.

A method of generating a supercontinuum in chalcogenide fiber with a pump light comprising a short pulse fiber laser or diode laser operating with a wavelength of 1.0μm or greater that is wavelength shifted through a nonlinear fiber one or more times and amplified one or more times and launched into a chalcogenide fiber whereby the spectrum is broadened in the chalcogenide fiber through various nonlinear processes to generate a supercontinuum within the mid-IR from 1.5 to greater than 5μm.

A supercontinuum light emitting device comprises an effectively CW light source producing light of wavelength λ₁ within a specified bandwidth and a nonlinear fiber optically coupled to the light source. The nonlinear fiber has a plurality of fiber segments with different zero dispersion wavelengths λo_i, where each successive fiber segment has zero dispersion wavelength λo_i which is larger than the zero dispersion wavelength of the preceding fiber and the zero dispersion wavelength of the first fiber segment is within ±20 nm of λ₁.

An apparatus and methods for generating a substantially supercontinuum-free widely-tunable multimilliwatt source of radiation characterized by a narrowband line profile. The apparatus and methods employ nonlinear optical mechanisms in a nonlinear photonic crystal fiber (PCF) by detuning the wavelength of a pump laser to a significant extent relative to the zero-dispersion wavelength (ZDW) of the PCF. Optical phenomena employed for the selective up-conversion in the PCF include, but are not limited to, four-wave mixing and Cherenkov radiation. Tunability is achieved by varying pump wavelength and power and by substituting different types of PCFs characterized by specified dispersion properties.

The invention discloses a white-light interference lens center thickness measuring system and a method, and belongs to the technical field of optical precise measurement, so as to solve the technical problems that the prior lens center thickness measuring device is low in measuring precision and small in dynamic measuring range. The white-light interference lens center thickness measuring system comprises a supercontinuum source, a photodetector, a 1:1 optical fiber coupler, a measuring arm, a reference arm, a first optical fiber, a second optical fiber and a data processing unit, wherein the measuring arm comprises a third optical fiber and a focusing lens; and the reference arm comprises a fourth optical fiber, a self-focusing lens, a scanning angle reflector, a plane mirror, a displacement mechanism and a length-measuring interferometer system. The precision of the system can reach 0.2 mum(3sigma) and the dynamic range can reach 1.5m.

Methods and apparatus for generating ultrashort optical pulses. Polarized pulses of a near-infrared source are launched substantially along a principle axis of a birefringent photonic crystal fiber characterized by normal dispersion at all wavelengths of transmission of the photonic crystal fiber. Supercontinuum pulses are generated from the photonic crystal fiber and compressed to form compressed pulses. Highly polarized supercontinuum pulses provide for transform-limited compressed pulse durations.

The invention discloses a high average power full optical fiber intermediate infrared supercontinuum light source. The light source comprises a pulse pumping source with an output pigtail, a single mode passive optical fiber, at least one level of thulium doped optical fiber amplifier, a second optical fiber combiner and an er-doped fluoride optical fiber, wherein the pulse pumping source with the output pigtail, the single mode passive optical fiber, at least one level of thulium doped optical fiber amplifier, the second optical fiber combiner and the er-doped fluoride optical fiber are successively connected along a light path. A second pumping source and the second input end of the second optical fiber combiner are connected. According to the invention, a high power laser diode is used to carry out pumping on the er-doped fluoride optical fiber, thus a spectrum is broadened in the optical fiber due to a nonlinear effect and is strengthened due to high gain produced by pumping near 2.7 microns; the nonlinear effect in an intermediate infrared wave band is further stimulated, thus a eventually acquired supercontinuum has a wide wavelength coverage area and high average power; due to the adoption of a full optical fiber structure, integration and commercialization can be easily carried out; and the light source has a wide application prospect in frequency measurement, wavelength division multiplexing and other fields.