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Multi-optical fiber passive phase-locking laser

A phase locking and laser technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of increased loss and difficulty in making fiber couplers, and achieve the effect of low loss and high coupling efficiency

Inactive Publication Date: 2011-11-30
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, as far as the current implementation methods of passive phase locking are concerned, the number of optical paths that can achieve phase locking is relatively small; the requirements for optical fiber structure are too high, and many of the implementation methods require optical fibers to be polarization-maintaining optical fibers; many-to-many optical fibers are required coupler, and such a fiber coupler is very difficult to manufacture, if the method of cascading 2×2 fiber couplers is used, the loss of the entire system will increase as the number of optical paths increases

Method used

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  • Multi-optical fiber passive phase-locking laser
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Examples

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Effect test

Embodiment approach 1

[0058] A multi-fiber passive phase-locked laser such as figure 1 , the laser includes a transmissive coupler 1, first and second active single-mode fibers 21, 22, a first reflector 31, a second reflector 32, a third reflector 33, a reflective coupler 4 and the first and second Two pumping sources 51,52.

[0059] The transmissive coupler 1 is a rotating body, such as Figure 5 , 6 , 7, made of pure quartz material, its transmission surface 12 is perpendicular to the axis, the fused ring surface 11 of the transmission coupler forms an angle of 45° with the transmission surface 12, the transmission surface 12 is coated with a total reflection film, and then engraved on the transmission surface 12 An annular transmission groove 121 whose section is an isosceles right triangle.

[0060] The reflective coupler 4 is a rotating body, such as figure 2 , 3 , 4, made of pure quartz material, its reflective surface 42 is perpendicular to the axis, the fusion ring surface 41 of the r...

Embodiment approach 2

[0073] A multi-fiber passive phase-locked laser such as Figure 9 , the laser includes a transmissive coupler 1, first to fourth active single-mode fibers 21, 22, 23, 24, a first reflector 31, a second reflector 32, a third reflector 33, a reflective coupler 4 and First to fourth pumping sources 51 , 52 , 53 , 54 .

[0074] The transmissive coupler 1 is a rotating body, such as Figure 13 , 14 , 15, made of pure quartz material, its transmission surface 12 is perpendicular to the axis, the fused ring surface 11 of the transmission coupler forms an angle of 45° with the transmission surface 12, the transmission surface 12 is coated with a total reflection film, and then engraved on the transmission surface 12 An annular transmission groove 121 whose section is an isosceles right triangle.

[0075] The reflective coupler 4 is a rotating body, such as Figure 10 , 11 , 12, made of pure quartz material, its reflective surface 42 is perpendicular to the axis, the fused ring su...

Embodiment approach 3

[0090] A multi-fiber passive phase-locked laser such as Figure 16 , the laser includes a transmissive coupler 1, the first to the first thousand and eighth active single-mode optical fibers 21, 22, ..., 21008, a conical quartz lens 3, a reflective coupler 4 and the first to the first thousand and eighth pumps Puyuan 51, 52, ..., 51008.

[0091] The transmissive coupler 1 is a rotating body, such as Figure 16 , 17 , 18, made of pure quartz material, its transmission surface 12 is perpendicular to the axis, the fused ring surface 11 of the transmission coupler forms an angle of 45° with the transmission surface 12, the transmission surface 12 is coated with a total reflection film, and then engraved on the transmission surface 12 The first and second annular transmission grooves 121 and 122 are of isosceles right triangle cross section.

[0092] The reflective coupler 4 is a rotating body, such as Figure 16 , 19 , 20, made of pure quartz material, its reflective surface ...

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Abstract

The invention discloses a multi-optical fiber passive phase-locking laser, which is suitable for the fields of industrial processing and national defense. In order to overcome the present problems of small quantity of optical paths of a passive phase-locking fiber laser, high requirements to optical fibers, and high difficulty in manufacturing many-to-many couplers, the passive phase-locking of multi-path optical fibers is realized by designing a novel coupler, so that laser output with high power and high optical beam quality is obtained. The specific implementation method comprises the steps of: connecting multi-path active monomode optical fibers by a reflection coupler (4) and a transmitting coupler (1) to realize phase locking; side-pumping first to Nth active monomode optical fibers (21, 22, ......, 2N) by using first to Nth pumping sources (51, 52,......, 5N); and shaping optical beams output by the transmitting coupler (1) by a first reflecting mirror, a second reflecting mirror and a third reflecting mirror (31, 32 and 33) to output optical beams with high quality. The laser is used for a laser energy source of a cutter in industrial processing or a laser source of a high-power laser cannon.

Description

technical field [0001] The invention relates to a passive phase-locked laser, which is suitable for industrial cutting, military and other fields requiring high laser output power and good beam quality. Background technique [0002] Lasers have attracted widespread attention since their inception, and research on high-power lasers has progressed rapidly in recent years. At present, high-power fiber lasers are widely used in industrial fields such as precision welding and cutting, and show broad application prospects in the military field. In recent years, the output power of fiber lasers has increased rapidly, and various methods for increasing laser output power have been proposed. [0003] First of all, fiber lasers based on cladding pumping technology have attracted widespread attention due to their good beam quality, high conversion efficiency, and compact structure. In 2004, the single-fiber output power of fiber lasers reached the kilowatt level. In 2009, IPG reporte...

Claims

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Application Information

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IPC IPC(8): H01S3/13H01S3/00
Inventor 温晓东宁提纲裴丽李晶油海东周倩顔玲玲
Owner BEIJING JIAOTONG UNIV
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