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Waveguide laser for carrying out transverse mode control by adopting filtering film matcher

A technology of waveguide lasers and transverse modes, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems of difficult to obtain high-power laser output, affect low-order mode power, and power drop, so as to increase the effective mode Field area, good mode selection effect, and the effect of increasing output power

Inactive Publication Date: 2012-11-14
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because this method is based on the change of the fiber core parameters, a large loss will be introduced when two fibers with different parameters are coupled; when the light propagates in the fiber core, both high-order modes and low-order modes will produce certain , which affects the power of the lower order modes, resulting in a reduction in the power of the desired mode
If it is applied to a laser, it is difficult to obtain high-power laser output

Method used

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  • Waveguide laser for carrying out transverse mode control by adopting filtering film matcher
  • Waveguide laser for carrying out transverse mode control by adopting filtering film matcher
  • Waveguide laser for carrying out transverse mode control by adopting filtering film matcher

Examples

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Embodiment 1

[0045] This embodiment is a slab waveguide laser using transverse mode control. Such as figure 1 As shown, the segmented slab waveguide consists of two sections I and II. Both I and II adopt a symmetrical structure. The core diameters of the guide cores (1) and (2) are both 100um. The overall size of the waveguide I is 0.4mm×4mm×12mm, and the entire waveguide size of the waveguide II is 0.5mm×5mm× 12mm. That is, the cladding (3) and substrate (5) of I are smaller than the cladding (4) and substrate (6) of II. The pump light is injected from one edge of I through the coupling device, and the laser oscillation gains gain in I. After entering II, it is completely reflected by the coating on the end face of II and returns, and then enters I. After multiple round trips, the high-order mode loss is greater than that of the low-order mode. Mode loss, the laser beam with better beam quality is finally output from the end face of II. The coating film (8) on the II end face is total...

Embodiment 2

[0047] This embodiment is a fiber laser using transverse mode control, such as figure 2 shown. LD pump source (9), dichroic mirrors (10), (11) and gain fiber (12) form a basic Fabry-Perot resonator cavity, the fiber adopts segmented structure, gain fiber (12) and guide fiber (13) Have the same core diameter, same numerical aperture and cladding size. The cladding of the gain fiber (12) is quincunx, and the cladding of the conducting fiber (13) is circular. The dichroic mirror (10) is close to the end face of the optical fiber (12), and it is highly transparent to the pump light and highly reflective to the fiber laser; the output mirror (11) is highly transparent to the incident pump light and partially transparent to the fiber laser. The pumping light is injected into the inner cladding of the optical fiber after passing through the dichroic mirror from both ends of the optical fiber, and excites laser oscillation in the optical fiber section (12). In one return journey, ...

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Abstract

The invention relates to a waveguide laser for carrying out transverse mode control by adopting a filtering film matcher, which belongs to the technical field of waveguide lasers. The waveguide laser is characterized by comprising a pumping device, a waveguide laser medium and a cavity lens, wherein the cavity lens is arranged on the end surface of the laser medium. The waveguide laser has the main technical scheme of adopting a sectional type waveguide structure of a filtering film matcher, namely a longitudinal waveguide structure or a parameter variable structure so that a laser beam is conducted or oscillated in waveguides with different parameters. In the process, a high-order mode consumes more energy than a low-order mode does and is weakened and even inhibited in mode competition,and the mode distributing power proportion is changed, therefore, a laser outputs laser light with better light beam quality. By adopting a novel parameter variable waveguide structure, the waveguidelaser of the invention can improve the quality of the light beam and is beneficial to realizing a large-mode field waveguide laser, thereby improving the power of the waveguide laser. The invention can be applied to a high-power waveguide laser.

Description

technical field [0001] The invention relates to a waveguide laser, in particular to a waveguide laser using a filter mode matcher for transverse mode control. Background technique [0002] When designing waveguide lasers, it is generally desirable to obtain high-power, high-beam-quality laser output. Among them, the maximum output power of the laser is affected by the saturation effect of the gain medium, which is proportional to the equivalent cross-sectional area of ​​the mode field; for fiber lasers, the power increase is more affected by stimulated Brillouin scattering (SBS), stimulated Limitations of nonlinear effects such as Raman scattering (SRS) and self-phase modulation (SPM), the power threshold generated by these nonlinear effects is also proportional to the equivalent area of ​​the mode field. In order to obtain higher power laser output, it is often necessary to increase the core diameter of the waveguide, but increasing the core diameter will inevitably lead t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/07H01S3/098H01S3/06H01S3/091
Inventor 巩马理闫平张海涛廖素英郝金坪
Owner TSINGHUA UNIV
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