Method for testing pump absorption coefficients of double-coated gain fiber

A technology for gaining optical fiber and absorption coefficient, which is applied in the direction of testing optical fiber/optical waveguide equipment, testing optical performance, etc. It can solve problems such as cumbersome steps, large absorption coefficient measurement value, and potential safety hazards, and achieve high reliability and environmental protection. small effect

CN107238485AActive Publication Date: 2017-10-10EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH +1
5 Cites 11 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-10-10

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a method for testing pump absorption coefficients of a double-coated gain fiber. The method comprises the following steps: (S1) welding an LD pump light source tail fiber with a fiber combiner pump tail fiber by virtue of a hectowatt-order LD pump light source needing to be subjected to wavelength testing, coupling pump light into high reflection grating by virtue of a fiber combiner, outputting the pump light from a high reflection grating tail fiber, and recording an output power value as pump coupling power; (S2) selecting a to-be-tested double-coated gain fiber with an initial length L0 less than or equal to 40m, and building a hectowatt-order vibration structure fiber laser device; (S3) recording power values of a fiber output end by virtue of a truncation method when the lengths of the to-be-tested fiber are L0, L1......LN and power values of an input end when a 45-degree dichroic mirror is inserted into the input end, so as to obtain corresponding surplus pump light power under each fiber length; and (S4) carrying out calculation and statistics so as to obtain the pump absorption coefficients of the double-coated gain fiber. According to the method, the influence caused by ASE upon a testing result can be omitted, a testing platform is stable and safe, and the accurate measurement of the pump absorption coefficients of a double-coated gain fiber is realized.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The invention relates to the technical field of fiber lasers, in particular to a method for testing the absorption coefficient of a double-clad gain fiber pump. Background technique

[0002] Most of the existing test methods use a low-power pump light source to directly couple into the double-clad gain fiber, and use the physical mechanism that "the gain fiber absorbs the pump light will generate spontaneous radiation, and the pump light output is not completely absorbed". Obtain the remaining pump light, calculate the absorption coefficient, and select a more reasonable value as the effective pump absorption coefficient of the fiber under test by repeatedly cutting and repeating the test.

[0003] Existing technology 1 (CN105222998B. National University of Defense Technology 2015) This method injects a broadband light source into the fiber under test with full numerical aperture through spatial coupling, cuts the fiber under test multiple times, obtains the ...

Examples

Embodiment Construction

[0038] Such as Figure 4 As shown, the embodiment of the present invention provides a method for testing the absorption coefficient of a double-cladding gain fiber pump, which includes the following steps:

[0039] S1. Using the LD pump light source with the wavelength to be measured in the order of hundreds of watts, the LD pump light source pigtail is fused with the fiber combiner pump pigtail, and the pump light is coupled to the high reflection grating through the fiber combiner. High-reverse grating pigtail output; put the optical power meter on the end of the high-reverse grating output pigtail, adjust the pump light source output power to gradually increase, read the power meter and record a set of power values, denoted as P 1 ;

[0040] S2, select the length as L 0 One end of the double-clad gain fiber to be tested is fused with the high-reflection grating output pigtail, and the other end is cut flat to form an optical resonant cavity;

[0041] S3. Adjust the output power o...