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CN-224232086-U - Inflated hollow fiber device for high-energy femtosecond pulse spectrum broadening

CN224232086UCN 224232086 UCN224232086 UCN 224232086UCN-224232086-U

Abstract

The utility model relates to the technical field of ultrafast lasers, in particular to an inflatable hollow fiber device for high-energy femtosecond pulse spectrum broadening, which comprises an incidence unit, a fiber supporting unit and an emergent unit, wherein an air extraction interface is arranged, so that the interiors of the incidence unit and the emergent unit can be vacuumized during actual use, residual air is avoided, the reliability is improved, the air extraction/inflation interface is utilized to charge required gas according to requirements, the device can realize the design that one end is inflated and the other end is air extracted, the air filling in the hollow fiber is further ensured to have uniform pressure gradient by utilizing pressure difference, the spectrum broadening capability is further improved, meanwhile, the hollow fiber is bonded with a fiber pipeline through a fiber sealing piece, the structure is simple, the operation is convenient, the connection reliability of the hollow fiber is ensured while the working efficiency is improved, and the damage is avoided.

Inventors

  • LI JIALIN
  • ZHANG MENG
  • ZHANG YICHEN
  • FU YUXI

Assignees

  • 中国科学院西安光学精密机械研究所

Dates

Publication Date
20260512
Application Date
20250506

Claims (10)

  1. 1. The inflatable hollow fiber device for high-energy femtosecond pulse spectrum broadening is characterized by comprising an incidence unit (100), a fiber support unit (200) and an emergent unit (300), wherein an air extraction interface (101) is arranged on the incidence unit (100), an air extraction/inflation interface (301) is arranged on the emergent unit (300), and the fiber support unit (200) comprises a fiber pipeline (210), a hollow fiber (220), a fiber sealing piece (230) and a pipeline support (240); The air extraction interface (101) is communicated with the incidence unit (100), the air extraction/inflation interface (301) is communicated with the emergent unit (300), the incidence unit (100), the optical fiber pipeline (210) and the emergent unit (300) are sequentially connected, the optical fiber pipeline (210) is sleeved on the outer side of the hollow optical fiber (220), two sides of the hollow optical fiber (220) are adhered to the inner wall of the optical fiber pipeline (210) through the optical fiber sealing piece (230), one end of the hollow optical fiber (220) penetrates through the optical fiber sealing piece (230) to extend to the incidence unit (100), and the other end of the hollow optical fiber (220) penetrates through the optical fiber sealing piece (230) to extend to the emergent unit (300).
  2. 2. The gas-filled hollow-core optical fiber device for high-energy femtosecond pulse spectral broadening as recited in claim 1 wherein said incident unit (100) and exit unit (300) are both detachably connected to the optical fiber conduit (210).
  3. 3. The gas-filled hollow-core optical fiber device for high-energy femtosecond pulse spectral broadening as recited in claim 1 wherein said incident unit (100) and exit unit (300) are each hermetically connected to the optical fiber conduit (210) by an O-ring sealing structure (250), said O-ring sealing structure (250) being located outside the conduit support (240).
  4. 4. A gas filled hollow fiber device for high energy femtosecond pulse spectral broadening as defined in claim 3 wherein said incident unit (100) comprises an incident window (110), an incident tee (120) and an incident straight through (130) connected in sequence; the air extraction interface (101) is arranged on the incidence three-way pipe (120), the incidence straight-way pipe (130) is sleeved on the outer side of the corresponding end part of the optical fiber pipeline (210), and the incidence straight-way pipe (130) is connected with the optical fiber pipeline (210) in a sealing mode through the KF vacuum flange (201).
  5. 5. The device of claim 4, wherein the incident window (110) is detachably connected to the incident tee (120) and the incident tee (120) is detachably connected to the incident tee (130).
  6. 6. The gas-filled hollow-core optical fiber device for high-energy femtosecond pulse spectral broadening as recited in claim 4 wherein the angle between the normal to said incident window (110) and the incident laser light is brewster's angle.
  7. 7. A gas filled hollow-core optical fiber device for high energy femtosecond pulse spectral broadening as defined in claim 3, wherein said exit unit (300) comprises an exit window (310), an exit tee (320) and an exit straight-through (330) connected in sequence; The air extraction/inflation interface (301) is arranged on the emergent three-way pipe (320), the emergent straight-way pipe (330) is sleeved on the outer side of the corresponding end part of the optical fiber pipeline (210), and the emergent straight-way pipe (330) is connected with the optical fiber pipeline (210) in a sealing way through the KF vacuum flange (201).
  8. 8. The device of claim 7, wherein the exit window (310) and the exit tee (320) and the exit tee (330) are detachable.
  9. 9. The device for high energy femtosecond pulse spectrum broadening of an air core optical fiber according to claim 1, wherein the pipe support (240) comprises a switching base (241), a first clamp (242), a second clamp (243) and a jack bolt (244), one end of the first clamp (242) is hinged with one end of the second clamp (243), and the other end of the first clamp (242) is connected with the other end of the second clamp (243) through a bolt; The jacking bolt (244) is in threaded connection with the first clamp (242), the jacking bolt (244) is arranged along the radial direction of the first clamp (242), and the adapter base (241) is connected with the outer surface of the second clamp (243).
  10. 10. The gas-filled hollow-core optical fiber device for high-energy femtosecond pulse spectral broadening as recited in claim 1, wherein said hollow-core optical fiber (220) is a flexible hollow-core optical fiber coaxially disposed with an optical fiber conduit (210).

Description

Inflated hollow fiber device for high-energy femtosecond pulse spectrum broadening Technical Field The utility model relates to the technical field of ultrafast lasers, in particular to an inflatable hollow fiber device for high-energy femtosecond pulse spectrum broadening. Background The femtosecond pulse with a small period magnitude has the characteristics of high instantaneous power and short pulse width, can realize detection and regulation of microscopic particles in a very short time scale, and can be used for exploring the microscopic dynamic process of substances, such as excitation of electrons in atoms, vibration relaxation of molecules and the like. According to the Fourier transform limit, the limit that the pulse width can be compressed is determined by the spectrum width of the pulse, so that the laser spectrum of the high-energy pulse needs to be fully widened by utilizing the nonlinear effect to obtain the low-cycle-level femtosecond pulse, namely, the length of the optical pulse is inversely proportional to the spectrum width of the pulse, the spectrum of the laser pulse needs to be widened as much as possible to obtain the ultra-short laser pulse, and the inflated hollow fiber widening technology is a common means for widening the high-energy femtosecond pulse due to the fact that the inflated inert gas has a larger nonlinear coefficient and the high-energy bearing capacity of the laser. For example, china patent application number 202321530163.1 provides a hollow optical fiber device for high-power laser femtosecond pulse stretching, which is used for realizing high-power laser femtosecond pulse stretching, but the inside of an air duct is inconvenient to fill inert gas, meanwhile, the filling purity of the inert gas cannot be ensured, the operation difficulty is increased, the working efficiency is reduced, the femtosecond pulse spectrum stretching effect is reduced, the reliability is low, meanwhile, the clamping structure of the hollow optical fiber is complex, the hollow optical fiber is easy to damage, the reliability is low, and the actual working requirement cannot be met. Disclosure of utility model The utility model aims to provide an inflatable hollow fiber device for high-energy femtosecond pulse spectrum broadening, which solves the technical problem of low reliability of the conventional inflatable hollow fiber device for high-energy femtosecond pulse spectrum broadening. The utility model solves the technical problems as follows: The inflatable hollow fiber device for high-energy femtosecond pulse spectrum broadening comprises an incidence unit, a fiber support unit and an emergent unit, wherein an air extraction interface is arranged on the incidence unit, an air extraction/inflation interface is arranged on the emergent unit, and the fiber support unit comprises a fiber pipeline, a hollow fiber, a fiber sealing piece and a pipeline support; The air extraction interface is communicated with the incidence unit, the air extraction/inflation interface is communicated with the emergence unit, the incidence unit, the optical fiber pipeline and the emergence unit are sequentially connected, the optical fiber pipeline is sleeved on the outer side of the hollow optical fiber, two sides of the hollow optical fiber are adhered to the inner wall of the optical fiber pipeline through the optical fiber sealing piece, one end of the hollow optical fiber penetrates through the optical fiber sealing piece to extend to the incidence unit, and the other end of the hollow optical fiber penetrates through the optical fiber sealing piece to extend to the emergence unit. Further defined, the entrance unit and the exit unit are both detachably connected to the fiber optic conduit. Further defined, the incident unit and the emergent unit are in sealing connection with the optical fiber pipeline through O-ring sealing structures, and the O-ring sealing structures are located on the outer sides of the pipeline support. Further defined, the incidence unit comprises an incidence window, an incidence tee and an incidence straight pipe which are connected in sequence; The air extraction interface is arranged on the incidence tee pipe, the incidence straight-through pipe is sleeved on the outer side of the corresponding end part of the optical fiber pipeline, and the incidence straight-through pipe is connected with the optical fiber pipeline in a sealing mode through the KF vacuum flange. Further limited, the incident window is detachably connected with the incident tee pipe and the incident tee pipe is detachably connected with the incident straight pipe. Further defined, the angle between the normal of the entrance window and the incident laser is brewster's angle. Further defined, the emergent unit comprises an emergent window, an emergent three-way pipe and an emergent straight-way pipe which are connected in sequence; the air extraction/inflation interface is arranged on the emergent three-way pip