Single-mode fiber laser with mini resonance cavity structure

The invention discloses a single-mode fiber laser with a mini resonance cavity structure, and relates to the fields of fiber-optical communication and high power and high light beam quality requirements. The invention aims to solve the problem that the structure is too complicated, or the power is difficult to increase, or laser characteristics cannot meet the requirement in the conventional fiber laser. The laser comprises an optical fiber, an optical grating and a pumping source. A mini resonance cavity (4) is arranged in the optical fiber, has a shape of a ring and tangent lines tangent with the ring, or a rectangle, and is positioned in the fiber core or a joint of a cladding and the fiber core. In the process of manufacturing the mini resonance cavity, the optical fiber is exposed by an ultraviolet laser or a femtosecond laser, the refractive index on the exposure part is higher that that of a peripheral medium, and the structure of the mini resonance cavity (4) is formed. The single-mode ...

Double greenhouse apparatus of single frequency fiber amplifier for raising stimulated Brillouin scattering threshold

The invention provides a double greenhouse apparatus of a single frequency fiber amplifier for raising stimulated Brillouin scattering threshold, belonging to the high rating narrow linewidth fiber laser and fiber amplifier field. According to the invention, the problems of complex technology, unable reuse of a fiber and small expansion of a fiber in present apparatus are solved. In the apparatus, the opening of the short shaft of a first thin elliptical half pipe (4) and the opening of the short shaft of a second thin elliptical half pipe (5) are positioned in a parallel way, and the first thin elliptical half pipe (4) and the second thin elliptical half pipe (5) are respectively arranged in a first heat insulation box (1) and a second heat insulation box (2). A first temperature controller load (17) and a second controller load (27) are respectively arranged in the first heat insulation box and the second heat insulation box, connecting a first temperature controller (16) and a second ...

Multi-wavelength fiber laser with miniature resonant cavity structures

The invention disclose a multi-wavelength fiber laser with miniature resonant cavity structures and relates to the field with requirements for high quality of optical-frequency bandwidth and the requirement of ouputting multiple wave lengths. The multi-wavelength fiber laser is used for solving the following technical problems: the structure of a fiber laser with multi-wavelength laser output is complicated, the output of high-quality multi-wavelength laser is not continuous, and the system is unstable and has high cost. The multi-wavelength fiber laser strcuturaly comprises an optical fiber formed by a fiber core (1) and a cladding (2), fiber bragg gratings (3), a miniature resonant cavity (4) in the optical fiber and a pumping source (5), and is characterized in that for the manufactureof the miniature resonant cavities, an ultraviolet laser or a femtosecond laser are adopted for exposing the optical fiber, so that the refractive index of the exposed part is higher than that of a peripheral ...

Quartz rod structure for changing refractive index profile by external exposure method

The invention discloses a quartz rod structure for changing a refractive index profile by an external exposure method, and relates to the field of optical fiber amplifiers and optical fiber lasers. The quartz rod structure comprises an exposure area (1) and an active quartz rod, wherein the active quartz rod comprises an active quartz rod core (2) and an externally wrapping layer (3); the exposure area is formed in the active quartz rod core and is subjected to external exposure from the end of the active quartz rod core, and exposure light beams change the refractive index of the exposure area; and the refractive index of the exposure area, the refractive index of the active quartz rod and the refractive index of the externally wrapping layer are gradually decreased in turn, wherein the refractive index range of the exposure area is between 1.455 and 1.459, the refractive index range of the active quartz rod is between 1.453 and 1.455, and the refractive index range of the externally wrapping ...

Method for manufacturing sampling fiber bragg grating by utilizing photointerrupter

The invention discloses a method for manufacturing a sampling fiber bragg grating by utilizing a photointerrupter, belonging to the fiber bragg grating manufacturing field. The method for manufacturing the sampling fiber bragg grating comprises the following steps: superposing two same light chopping sheets together to form a combined light chopping sheet (106) with a width-adjustable light transmitting area; placing a light chopping head (107) fixed with combined light chopping sheets between a convergent lens (105) and a phase maskplate (109) to be fixed on a translation stage (103); simultaneously starting an ultraviolet light source (101), the controller of the light chopping sheet and the translation stage; ultraviolet light (102) after being converged by the convergent lens and passing through slits on the combined light chopping sheets enters onto the phase maskplate and photosensitive fiber (110); and carrying out periodical exposure of the photosensitive fiber by utilizing the ...

Conical coupling long-period optical fiber grating and method of manufacturing same

The invention relates to a tapered coupled long-period fiber grating and a manufacturing method thereof, which are suitable for the fields of optical fiber communication, sensing, microwave photon and so on. The method comprises the following steps: one end of an optical fiber (7) is fixed on a mobile device (1) and the other end of the optical fiber (7) is fixed on a heavy object (6) through a dead pulley (5); the optical fiber is supported into a left optical fiber clamping V-shaped groove (21) and a right optical fiber clamping V-shaped groove (22); after the optical fiber is in the straightening state by the heavy object, the optical fiber is clamped into the left and right optical fiber clamping V-shaped grooves; a coating of the optical fiber between the optical fiber clamping V-shaped grooves is stripped; the coating stripping position is heated to the fusion temperature by an upper heating device (31) and a lower heating device (32); the left optical fiber clamping V-shaped groove ...

Single mode fiber (SMF) laser with large effective area by changing cladding index distribution

The invention discloses a single mode fiber (SMF) laser with large effective area by changing cladding index distribution, which is applied to the field of fiber communication and industrial cutting. For the purpose of solving the problem that an existing laser can not realize single mode and high power simultaneously, the cladding index distribution condition of fibers in the laser is changed tochange transmission laser modes in a fiber core so as to realize large-mode-area (LMA) laser output under the condition of the single mode. The technical scheme is as follows: a hydrofluoric acid solution is utilized to etch off the claddings of fibers between a first fiber bragg grating (FBG) (31) and a second FBG (32), and quartz of which the refractive index is more than that of the claddings (2) or less than that of the fiber core (1) are filled so as to form a fill area (4). The fill area is of a D-shaped, ring-shaped, rectangle and spiral winding. The fiber laser is used for signal sources ...

Multi-wavelength fiber laser with miniature resonant cavity structures

The invention disclose a multi-wavelength fiber laser with miniature resonant cavity structures and relates to the field with requirements for high quality of optical-frequency bandwidth and the requirement of ouputting multiple wave lengths. The multi-wavelength fiber laser is used for solving the following technical problems: the structure of a fiber laser with multi-wavelength laser output is complicated, the output of high-quality multi-wavelength laser is not continuous, and the system is unstable and has high cost. The multi-wavelength fiber laser strcuturaly comprises an optical fiber formed by a fiber core (1) and a cladding (2), fiber bragg gratings (3), a miniature resonant cavity (4) in the optical fiber and a pumping source (5), and is characterized in that for the manufacture of the miniature resonant cavities, an ultraviolet laser or a femtosecond laser are adopted for exposing the optical fiber, so that the refractive index of the exposed part is higher than that of a peripheral ...

Pulley device for improving stimulated Brillouin scattering threshold value of high-power optical fiber amplifier

The invention relates to a pulley device for improving the stimulated Brillouin scattering threshold value of a high-power optical fiber amplifier, belonging to the filed of a high-power narrow linewidth optical fiber laser and a narrow linewidth optical fiber amplifier. The pulley device for improving the stimulated Brillouin scattering threshold value of the high-power optical fiber amplifier overcomes the defects of the existing device, namely the process is complex, the optical fiber can not be reused, the flexibility of the optical fiber is small, and the like. In the invention, two endsof the oval long shaft of the large hole of an oval conical tube (4) are fixedly connected with one end of a first steel rope (51) and one end of a second steel wire rope (52) respectively, the otherend of the first steel rope (51) and the other end of the second steel wire rope (52) are fixedly connected with a big mass ball (61) through a first pulley (21) and a second pulley (22), two ends ofthe ...

Single-mode fiber laser with mini resonance cavity structure

The invention discloses a single-mode fiber laser with a mini resonance cavity structure, and relates to the fields of fiber-optical communication and high power and high light beam quality requirements. The invention aims to solve the problem that the structure is too complicated, or the power is difficult to increase, or laser characteristics cannot meet the requirement in the conventional fiber laser. The laser comprises an optical fiber, an optical grating and a pumping source. A mini resonance cavity (4) is arranged in the optical fiber, has a shape of a ring and tangent lines tangent with the ring, or a rectangle, and is positioned in the fiber core or a joint of a cladding and the fiber core. In the process of manufacturing the mini resonance cavity, the optical fiber is exposed byan ultraviolet laser or a femtosecond laser, the refractive index on the exposure part is higher that that of a peripheral medium, and the structure of the mini resonance cavity (4) is formed. The single-mode ...

Quartz rod structure for changing refractive index profile by external exposure method

The invention discloses a quartz rod structure for changing a refractive index profile by an external exposure method, and relates to the field of optical fiber amplifiers and optical fiber lasers. The quartz rod structure comprises an exposure area (1) and an active quartz rod, wherein the active quartz rod comprises an active quartz rod core (2) and an externally wrapping layer (3); the exposure area is formed in the active quartz rod core and is subjected to external exposure from the end of the active quartz rod core, and exposure light beams change the refractive index of the exposure area; and the refractive index of the exposure area, the refractive index of the active quartz rod and the refractive index of the externally wrapping layer are gradually decreased in turn, wherein the refractive index range of the exposure area is between 1.455 and 1.459, the refractive index range of the active quartz rod is between 1.453 and 1.455, and the refractive index range of the externallywrapping ...

Pulley device for improving stimulated Brillouin scattering threshold value of high-power optical fiber amplifier

The invention relates to a pulley device for improving the stimulated Brillouin scattering threshold value of a high-power optical fiber amplifier, belonging to the filed of a high-power narrow linewidth optical fiber laser and a narrow linewidth optical fiber amplifier. The pulley device for improving the stimulated Brillouin scattering threshold value of the high-power optical fiber amplifier overcomes the defects of the existing device, namely the process is complex, the optical fiber can not be reused, the flexibility of the optical fiber is small, and the like. In the invention, two ends of the oval long shaft of the large hole of an oval conical tube (4) are fixedly connected with one end of a first steel rope (51) and one end of a second steel wire rope (52) respectively, the other end of the first steel rope (51) and the other end of the second steel wire rope (52) are fixedly connected with a big mass ball (61) through a first pulley (21) and a second pulley (22), two ends of the ...

High precision polishing method and device for arc discharge fiber cross section

Single mode fiber (SMF) laser with large effective area by changing cladding index distribution

The invention discloses a single mode fiber (SMF) laser with large effective area by changing cladding index distribution, which is applied to the field of fiber communication and industrial cutting. For the purpose of solving the problem that an existing laser can not realize single mode and high power simultaneously, the cladding index distribution condition of fibers in the laser is changed to change transmission laser modes in a fiber core so as to realize large-mode-area (LMA) laser output under the condition of the single mode. The technical scheme is as follows: a hydrofluoric acid solution is utilized to etch off the claddings of fibers between a first fiber bragg grating (FBG) (31) and a second FBG (32), and quartz of which the refractive index is more than that of the claddings (2) or less than that of the fiber core (1) are filled so as to form a fill area (4). The fill area is of a D-shaped, ring-shaped, rectangle and spiral winding. The fiber laser is used for signal sources ...