# US 11,079,656 B2 · Supercontinuum source, method for generating and emitting a supercontinuum, multiphoton excitation fluorescence microscope, and multiphoton excitation method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,656 B2 - Document ID: US11079656B2 - Status: Granted - Kind: B2 - Application number: 16/091,819 - Filed: 2017-04-04 - Published: 2019-05-02 - Granted: 2021-08-03 - Earliest claimed: 2016-04-05 - Assignees: Ushio Denki Kabushiki Kaisha - Applicants: Ushio Denki Kabushiki Kaisha - Inventors: Akira Ichihara; Akihiko Nakano; Aiko Sawada; Aya Ota - Web page: https://patentgrep.com/patent/US11079656B2 ## CPC - G02F 1/365: in an optical waveguide structure (G02F1/377, {G02F1/395} take precedence) - G01N 21/6458: {Fluorescence microscopy (fluorescence microscopes per se G02B21/0076 and G02B21/16)} - G02B 21/16: adapted for ultraviolet illumination {; Fluorescence microscopes (G02B21/0076 takes precedence)} - G01N 2201/0697: Pulsed lasers - G02F 1/3528: {for producing a supercontinuum} - G02F 2201/02: fibre - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An ultrashort light pulse oscillated from an ultrashort pulse oscillator enters a waveguide (2) via a polarization control element (3). After conversion into a supercontinuum by a nonlinear optical effect, it is compressed by a prism pair compressor (71) as pulse compressor (7), and then emitted. The waveguide (2), which is a nonlinear fiber with normal dispersion in the wavelength range from 850 to 1550, generates the supercontinuum having a spectrum continuous in a wavelength band width of at least 200 nm included in the wavelength range from 850 to 1550 nm. The supercontinuum, which has a peak power within 1 to 100 kW, can be used as excitation light in a multiphoton excitation fluorescence microscope for fluorescence observation of biological samples. ## Claims ### Claim 1 A supercontinuum source to generate and emit a supercontinuum, comprising: a pulse oscillator oscillating an ultrashort light pulse, and a waveguide converting the oscillated ultrashort light pulse from the pulse oscillator into a supercontinuum by a nonlinear optical effect, and then emitting, wherein the waveguide has a conversion characteristic where the ultrashort light pulse is converted into the supercontinuum having a spectrum continuous in a wavelength band width of at least 200 nm included in the wavelength range from 850 to 1550 nm and having a wavelength flatness within 3 dB in the wavelength band width of at least 200 nm included in the wavelength range from 850 to 1550 nm, the pulse oscillator and the waveguide are operable to emit the supercontinuum with a peak power within 1 to 100 kW enabling multiphoton excitation of an object on an irradiated plane, and the ultrashort light pulse has a pulse width not more than 1 ps and a center wavelength in the wavelength range from 1000 to 1100 nm. ### Claim 2 (depends on 1) The supercontinuum source as claimed in claim 1, wherein the waveguide has the conversion characteristic where the temporal shift of wavelength of the supercontinuum is continuous in one pulse. ### Claim 3 (depends on 1) The supercontinuum source as claimed in claim 1, wherein the waveguide is a fiber with normal dispersion in the wavelength range from 850 to 1550 nm. ### Claim 4 (depends on 3) The supercontinuum source as claimed in claim 3, wherein the center wavelength of the ultrashort light pulse is in the range of plus and minus 50 nm to the peak wavelength of the group velocity dispersion spectrum of the fiber with normal dispersion. ### Claim 5 (depends on 1) The supercontinuum source as claimed in claim 1, further comprising a pulse compressor to increase the peak power of the supercontinuum by compressing the supercontinuum emitted from the waveguide. ### Claim 6 (depends on 2) The supercontinuum source as claimed in claim 2, further comprising a pulse compressor to increase the peak power of the supercontinuum by compressing the supercontinuum emitted from the waveguide. ### Claim 7 A method for generating and emitting a supercontinuum, comprising: oscillating an ultrashort light pulse by a pulse oscillator, making the ultrashort light pulse from the pulse oscillator enter into a waveguide, and converting the ultrashort light pulse into a supercontinuum by a nonlinear optical effect in the waveguide, and then emitting therefrom, wherein the waveguide converts the ultrashort light pulse into the supercontinuum having a spectrum continuous in a band width of at least 200 nm included in the wavelength range from 850 to 1550 nm and having a wavelength flatness within 3 dB in the wavelength band width of at least 200 nm included in the wavelength range from 850 to 1550 nm, and the ultrashort light pulse oscillated from the pulse oscillator has a pulse width not more than 1 ps and the center wavelength in the wavelength range from 1000 nm to 1100 nm, and further comprising emitting the supercontinuum with a peak power within 1 to 100 kW to enable multiphoton excitation of an object on an irradiated plane. ### Claim 8 (depends on 7) The method for generating and emitting a supercontinuum as claimed in claim 7, wherein the waveguide converts the ultrashort light pulse into the supercontinuum where the temporal shift of wavelength is continuous. ### Claim 9 (depends on 7) The method for generating and emitting a supercontinuum as claimed in claim 7, wherein the waveguide is a fiber with normal dispersion in the wavelength range from 850 to 1550 nm. ### Claim 10 (depends on 9) The method for generating and emitting a supercontinuum as claimed in claim 9, wherein the center wavelength of the ultrashort light pulse is in the range of plus and minus 50 nm to the peak wavelength of the group velocity dispersion spectrum of the fiber with normal dispersion. ### Claim 11 (depends on 7) The method for generating and emitting a supercontinuum as claimed in claim 7, further comprising increasing the peak power of the supercontinuum emitted from the waveguide by pulse compression thereof. ### Claim 12 (depends on 8) The method for generating and emitting a supercontinuum as claimed in claim 8, further comprising increasing the peak power of the supercontinuum emitted from the waveguide by pulse compression thereof. ### Claim 13 (depends on 1) A multiphoton excitation fluorescence microscope comprising the supercontinuum source as claimed in claim 1, further comprising an optical system to irradiate an object with the supercontinuum emitted from the waveguide, and a detector to detect a fluorescence emitted when the object is subjected to multiphoton excitation by the supercontinuum. ### Claim 14 (depends on 5) The supercontinuum source as claimed in claim 5, wherein the pulse compressor is a prism pair compressor comprising a pair of prisms where a light wave at a longer wavelength has a longer overall propagation length. ### Claim 15 (depends on 5) The supercontinuum source as claimed in claim 5, wherein the pulse compressor is a prism pair compressor comprising plural pairs of prisms where a light wave at a longer wavelength has a longer overall propagation length, further comprising a mirror at a position where the supercontinuum from the pairs of the prisms is returned thereto, making the supercontinuum pass through the pairs of the prisms plural times. ### Claim 16 (depends on 6) The supercontinuum source as claimed in claim 6, wherein the pulse compressor is a prism pair compressor comprising plural pairs of prisms where a light wave at a longer wavelength has a longer overall propagation length, further comprising a mirror at a position where the supercontinuum from the pairs of the prisms is returned thereto, making the supercontinuum pass through the pairs of the prisms plural times.