High-efficiency all-optical-fiber column vector light beam laser

Abstract

The invention discloses a high-efficiency all-optical-fiber column vector light beam laser. Less-mode and long-period fiber bragg grating can realize high-efficiency conversion from a fundamental modeto a first-order mode and has the characteristic of low insertion loss; and by introducing the less-mode and long-period fiber bragg grating into a laser cavity to be used as a mode conversion device, the mode conversion efficiency is improved and intra-cavity loss can be lowered, so that high-efficiency output of the column vector light beam can be realized. The laser comprises an amplifier module used for laser generation and amplification, a resonance cavity module used for realizing laser resonance, a polarization control module used for controlling the intra-cavity laser polarization state, and a mode conversion module, namely the less-mode and long-period fiber bragg grating, used for realizing high-efficiency mode conversion. The column vector light beam output by the laser has thecharacteristics of high efficiency, low threshold value, high purity, mode switchable property and the like, no space coupling structure, high stability, high portability and suitability of productization.

Description

technical field

[0001] The invention relates to the field of fiber lasers, in particular to a high-efficiency cylindrical vector beam laser based on a few-mode long-period fiber grating. Background technique

[0002] Different from ordinary polarized beams, cylindrical vector light means that the polarization direction on the cross-section of the beam has a cylindrically symmetrical distribution, and its transverse light intensity distribution is circular. Generally, it can be divided into angular and radial polarized light.

[0003] The special polarization and amplitude characteristics of cylindrical vector light make it applicable in many fields, such as particle manipulation, material processing, plasma excitation, optical storage, super-resolution microscopic imaging, optical communication and other fields.

[0004] Compared with the column vector laser with spatial coupling structure, the all-fiber column vector laser has the characteristics of good portability, good s...

Examples

Embodiment Construction

[0021] Before describing the structure of the embodiment in detail, a brief description of the theory of few-mode long-period fiber gratings will be given.

[0022] Few-mode long-period fiber gratings are used in few-mode fibers using ultraviolet laser technology, femtosecond laser technology, arc technology, mechanical microbend technology, CO 2 The resonant wavelength of the few-mode long-period fiber grating is within the emission spectrum range of the doped fiber and within the reflection wavelength range of the two reflective surfaces. The few-mode fiber refers to the fiber whose normalized frequency V is greater than 2.405 and can support few-mode or multi-mode transmission. Because TM 01 and TE 01 The mode belongs to the first-order mode, so we generally take 2.40501 and TE 01 mode, and can avoid interference caused by higher-order modes. Similar to the long-period grating written in a single-mode fiber, when the resonance condition is satisfied, the incident fundam...

technical field

[0001] The invention relates to the field of fiber lasers, in particular to a high-efficiency cylindrical vector beam laser based on a few-mode long-period fiber grating. Background technique

[0002] Different from ordinary polarized beams, cylindrical vector light means that the polarization direction on the cross-section of the beam has a cylindrically symmetrical distribution, and its transverse light intensity distribution is circular. Generally, it can be divided into angular and radial polarized light.

[0003] The special polarization and amplitude characteristics of cylindrical vector light make it applicable in many fields, such as particle manipulation, material processing, plasma excitation, optical storage, super-resolution microscopic imaging, optical communication and other fields.

[0004] Compared with the column vector laser with spatial coupling structure, the all-fiber column vector laser has the characteristics of good portability, good s...

Examples

Embodiment Construction

[0021] Before describing the structure of the embodiment in detail, a brief description of the theory of few-mode long-period fiber gratings will be given.

[0022] Few-mode long-period fiber gratings are used in few-mode fibers using ultraviolet laser technology, femtosecond laser technology, arc technology, mechanical microbend technology, CO 2 The resonant wavelength of the few-mode long-period fiber grating is within the emission spectrum range of the doped fiber and within the reflection wavelength range of the two reflective surfaces. The few-mode fiber refers to the fiber whose normalized frequency V is greater than 2.405 and can support few-mode or multi-mode transmission. Because TM 01 and TE 01 The mode belongs to the first-order mode, so we generally take 2.40501 and TE 01 mode, and can avoid interference caused by higher-order modes. Similar to the long-period grating written in a single-mode fiber, when the resonance condition is satisfied, the incident fundam...

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