8-cavity orbital angular momentum mode mode-locked fiber laser device

Abstract

The invention discloses a 8-cavity orbital angular momentum mode mode-locked fiber laser device. The laser device includes a fundamental mode pump source, a first polarization controller, an orbital angular momentum mode generator, a wavelength division multiplexer, a vortex gain fiber, a second polarization controller, a first fiber coupler, a second fiber coupler, a polarization isolator, a third polarization controller and a vortex fiber. Based on fiber mode separation and optimization design, generation and stable transmission of a specific order orbital angular momentum mode in a resonantcavity and an output end can be guaranteed by the vortex fiber device; based on the same-order mode pumping mechanism and the filter mode effect of the resonant cavity, the gain of the signal light of the same-order orbital angular momentum mode in the resonant cavity is maximized, furthermore, the orbital angular momentum mode mode-locked laser output is obtained under the non-linear magnifyingring mirror mode-locking technology. The laser device is advantaged in that based on the single-mode direct resonance mechanism in the 8-shaped cavity, the outputted orbital angular momentum mode mode-locked laser has high mode purity and good beam quality.

Description

technical field

[0001] The invention relates to the field of laser technology, in particular to an 8-cavity orbital angular momentum mode-locked fiber laser. Background technique

[0002] A vortex beam is a field distribution with a helical phase term exp( ilφ ) of a beam in which each photon carries lh Orbital angular momentum ( l is the topological charge, φ is the azimuth angle, h is Planck's constant), and has the characteristics of annular light field distribution and spiral phase singularity. These unique properties make it widely used in the fields of material processing, optical tweezers, high-resolution imaging, fiber optic sensing, and fiber optic communication. However, these application prospects put forward higher requirements on the output peak power, stability, mode purity and bandwidth of the vortex beam. Mode-locked pulsed lasers can meet such requirements due to their advantages such as narrow pulse width, high peak power, and wide spectral width. A...

Examples

Embodiment 1

[0028] Such as figure 1 Shown is the 8-cavity orbital angular momentum mode-locked fiber laser in this embodiment, including a fundamental mode pump source 1, a first polarization controller 2, an orbital angular momentum mode generator 3, a wavelength division multiplexer 4, a second Two polarization controllers 5 , a vortex gain fiber 6 , a first fiber coupler 7 , a second fiber coupler 8 , a polarization isolator 9 and a third polarization controller 10 . Wherein, the orbital angular momentum mode generator 3 has a first port 301 and a second port 302; the wavelength division multiplexer 4 has a first port 401, a second port 402 and a third port 403; the first fiber coupler 7 has a first port 401; A port 701, a second port 702, a third port 703 and a fourth port 704; the second fiber coupler 8 has a first port 801, a second port 802 and a third port 803; The optical fiber is connected to the first port 301 of the orbital angular momentum mode generator 3, the first polariza...

technical field

[0001] The invention relates to the field of laser technology, in particular to an 8-cavity orbital angular momentum mode-locked fiber laser. Background technique

[0002] A vortex beam is a field distribution with a helical phase term exp( ilφ ) of a beam in which each photon carries lh Orbital angular momentum ( l is the topological charge, φ is the azimuth angle, h is Planck's constant), and has the characteristics of annular light field distribution and spiral phase singularity. These unique properties make it widely used in the fields of material processing, optical tweezers, high-resolution imaging, fiber optic sensing, and fiber optic communication. However, these application prospects put forward higher requirements on the output peak power, stability, mode purity and bandwidth of the vortex beam. Mode-locked pulsed lasers can meet such requirements due to their advantages such as narrow pulse width, high peak power, and wide spectral width. A...

Examples

Embodiment 1

[0028] Such as figure 1 Shown is the 8-cavity orbital angular momentum mode-locked fiber laser in this embodiment, including a fundamental mode pump source 1, a first polarization controller 2, an orbital angular momentum mode generator 3, a wavelength division multiplexer 4, a second Two polarization controllers 5 , a vortex gain fiber 6 , a first fiber coupler 7 , a second fiber coupler 8 , a polarization isolator 9 and a third polarization controller 10 . Wherein, the orbital angular momentum mode generator 3 has a first port 301 and a second port 302; the wavelength division multiplexer 4 has a first port 401, a second port 402 and a third port 403; the first fiber coupler 7 has a first port 401; A port 701, a second port 702, a third port 703 and a fourth port 704; the second fiber coupler 8 has a first port 801, a second port 802 and a third port 803; The optical fiber is connected to the first port 301 of the orbital angular momentum mode generator 3, the first polariza...

Images