Multi-wavelength fiber-optic imaging device and system
A multi-wavelength fiber-optic imaging device includes a plurality of optical fibers, a scanner, and an objective lens. By providing the plurality of optical fibers, which may have different specifications, a plurality of first light beams with different wavelengths can be respectively transmitted to the scanner. The scanner changes propagation directions of the plurality of first light beams with different wavelengths and scans a target tissue. And the plurality of first light beams with different wavelengths are focused on the target tissue by the objective lens, so as to conduct imaging of the target tissue. The multi-wavelength fiber-optic imaging device realizes separate transmission of the plurality of first light beams with different wavelengths, expands a wavelength range of working light beams transmitted by the imaging device, and uses the plurality of first light beams with different wavelengths to conduct imaging of the target tissue.
1 . A multi-wavelength fiber-optic imaging device, comprising:
a plurality of optical fibers, configured to transmit a plurality of first light beams respectively, wherein the plurality of first light beams transmitted by the plurality of optical fibers are different in wavelengths, a first end of an optical fiber is configured to receive a first light beam, and a second end of the optical fiber is configured to output the first light beam;
a scanner, disposed at a first-light-beam output side of the plurality of optical fibers, configured to receive the plurality of first light beams emitted from second ends of the plurality of optical fibers and change propagation directions of the plurality of first light beams to realize imaging scanning;
an objective lens, disposed at a first-light-beam output side of the scanner, configured to focus the plurality of first light beams on the target tissue, to conduct imaging of the target tissue; and
a collimating optical element, disposed between the plurality of optical fibers and the scanner, configured to collimate the plurality of first light beams emitted from the second ends of the plurality of optical fibers;
wherein the collimating optical element comprises a first collimating lens disposed between the plurality of optical fibers and the scanner, and the first collimating lens is configured to collimate the plurality of first light beams emitted from the second ends of the plurality of optical fibers;
the first collimating lens has a plurality of first focal points located on a first main optical axis, the plurality of first focal points respectively correspond to the plurality of first light beams, and the second end of the optical fiber corresponding to the first light beam is located at a first focal point corresponding to the same first light beam, to make the propagation directions of the plurality of first light beams emitted from the first collimating lens parallel.
2 . The multi-wavelength fiber-optic imaging device according to claim 1 , wherein the first collimating lens comprises a lens with an Abbe number less than a preset value and/or a lens group, to increase a distance between adjacent first focal points.
3 . The multi-wavelength fiber-optic imaging device according to claim 1 , further comprising:
a first beam-combining optical element, disposed between the first collimating lens and the scanner,
wherein the first beam-combining optical element has a first refractive surface and a second refractive surface parallel to each other, when the plurality of first light beams with parallel propagation directions propagate to the first refractive surface, incident angles of the plurality of first light beams are greater than 0° and less than 90°, the plurality of first light beams are capable of entering the first beam-combining optical element from the first refractive surface and being emitted from the first beam-combining optical element from the second refractive surface, and after the plurality of first light beams exit the second refractive surface, the propagation directions of the plurality of first light beams coincide.
4 . The multi-wavelength fiber-optic imaging device according to claim 1 , further comprising:
a second beam-combining optical element, disposed between the first collimating lens and the scanner,
wherein the second beam-combining optical element comprises a plurality of first optical coatings arranged parallel to each other and spaced apart, the plurality of first optical coatings are in one-to-one correspondence with the plurality of first light beams, and each first optical coating is capable of reflecting the corresponding first light beam and transmitting the first light beam other than the corresponding first light beam, so that each first light beam is capable of reaching the corresponding first optical coating, and after the plurality of first light beams are respectively reflected by the corresponding first optical coatings, the propagation directions of the plurality of first light beams coincide.
5 . The multi-wavelength fiber-optic imaging device according to claim 1 , further comprising:
a probe, provided with an accommodation space to accommodate the second ends of the plurality of optical fibers, the scanner, and the objective lens.
6 . A multi-wavelength fiber-optic imaging system, comprising:
the multi-wavelength fiber-optic imaging device according to claim 1 ; and
a multi-wavelength light source, disposed at the first-light-beam receiving side of the plurality of optical fibers, configured to provide the plurality of first light beams with different wavelengths to the first ends of the plurality of optical fibers respectively.
7 . The multi-wavelength fiber-optic imaging system according to claim 6 , further comprising:
at least one coupler, disposed between the multi-wavelength light source and the first end of the corresponding optical fiber, configured to couple a first light beam provided by at least one light source to the first end of the corresponding optical fiber.
8 . The multi-wavelength fiber-optic imaging system according to claim 7 , wherein the coupler comprises at least one of a gradient index lens, a spherical lens, an aspherical lens, a cemented lens, and a lens group.
9 . The multi-wavelength fiber-optic imaging system according to claim 7 , further comprising: an optical fiber ferrule, wherein the first end of the optical fiber is a tail end of a first end portion of the optical fiber, and first end portions of the plurality of optical fibers are inserted into the optical fiber ferrule.
10 . The multi-wavelength fiber-optic imaging system according to claim 7 , further comprising: at least one reflecting mirror disposed between the multi-wavelength light source and the at least one coupler, wherein the reflecting mirror is configured to reflect the plurality of first light beams to change the propagation directions of the plurality of first light beams to enable the plurality of first light beams to enter the first ends of the plurality of optical fibers through a same coupler.
11 . The multi-wavelength fiber-optic imaging system according to claim 7 , further comprising: at least one light modulator disposed between the multi-wavelength light source and the at least one coupler, wherein the light modulator is configured to control an intensity of the first light beam.
12 . The multi-wavelength fiber-optic imaging system according to claim 7 , wherein the objective lens is further configured to receive second light beams feedback by the target tissue and output the second light beams to the scanner; and
the scanner is further configured to output the second light beams to the second ends of the plurality of optical fibers.
13 . The multi-wavelength fiber-optic imaging system according to claim 12 , further comprising: a second light beam collection module disposed between the multi-wavelength light source and the at least one coupler,
wherein the second light beam collection module is configured to collect the second light beams; and
the coupler is further configured to couple the second light beams output by the first ends of the plurality of optical fibers to the second light beam collection module.
14 . The multi-wavelength fiber-optic imaging system according to claim 13 , wherein the second light beam collection module further comprises a beam splitter and a photoelectric conversion module, wherein the beam splitter is disposed between the multi-wavelength light source and the at least one coupler and is capable of transmitting the first light beams and reflecting the second light beams; and
the photoelectric conversion module is disposed at a side of the beam splitter reflecting the second light beams, and is configured to convert the received second light beams into an electrical signal.
15 . The multi-wavelength fiber-optic imaging system according to claim 14 , wherein the second light beam collection module further comprises a condensing lens disposed between the beam splitter and the photoelectric conversion module, and the condensing lens is configured to focus the second light beams reflected by the beam splitter into the photoelectric conversion module.
16 . A multi-wavelength fiber-optic imaging device, comprising:
a plurality of optical fibers, configured to transmit a plurality of first light beams respectively, wherein the plurality of first light beams transmitted by the plurality of optical fibers are different in wavelengths, a first end of an optical fiber is configured to receive a first light beam, and a second end of the optical fiber is configured to output the first light beam;
a scanner, disposed at a first-light-beam output side of the plurality of optical fibers, configured to receive the plurality of first light beams emitted from second ends of the plurality of optical fibers and change propagation directions of the plurality of first light beams to realize imaging scanning;
an objective lens, disposed at a first-light-beam output side of the scanner, configured to focus the plurality of first light beams on the target tissue, to conduct imaging of the target tissue; and
a collimating optical element, disposed between the plurality of optical fibers and the scanner, configured to collimate the plurality of first light beams emitted from the second ends of the plurality of optical fibers;
wherein the collimating optical element comprises a second collimating lens disposed between the plurality of optical fibers and the scanner, and the second collimating lens is configured to collimate the first light beams emitted from the second ends of the plurality of optical fibers, and the second collimating lens has a second main optical axis;
an extension direction of a rotation axis of a light cone formed by each first light beam emitted from the second end of the optical fiber is parallel to or coinciding with an extension direction of the second main optical axis; and
the second collimating lens has a plurality of second focal points and a plurality of focal planes, the plurality of second focal points are in one-to-one correspondence with the plurality of first light beams, each focal plane comprises one second focal point, and the second end of the optical fiber corresponding to the first light beam is disposed at the focal plane corresponding to the same first light beam.
17 . The multi-wavelength fiber-optic imaging device according to claim 16 , further comprising:
a third beam-combining optical element, disposed between the second collimating lens and the scanner,
wherein the third beam-combining optical element comprises a plurality of second optical coatings, normal directions of the plurality of second optical coatings are arranged to intersect with each other, the plurality of second optical coatings are in one-to-one correspondence with the plurality of first light beams, and each second optical coating is capable of reflecting the corresponding first light beam and transmitting the first light beam other than the corresponding first light beam, so that each first light beam is capable of reaching the corresponding second optical coating, and after the plurality of first light beams are respectively reflected by the corresponding second optical coatings, the propagation directions of the plurality of first light beams coincide, and each of the plurality of first light beams has a corresponding field of view, and a field of view of the multi-wavelength fiber-optic imaging device is an intersection of the fields of view corresponding to the plurality of first light beams.