Pulse thulium-doped fiber laser device

A fiber laser and laser technology are applied in the field of lasers to achieve the effects of economical cost, high power density of pump light and simplified structure

Pending Publication Date: 2021-11-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the gain switching function requires the pulsed pump light to be generated first, and additional Q-switching components also need to be introduced.

Method used

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  • Pulse thulium-doped fiber laser device
  • Pulse thulium-doped fiber laser device

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Embodiment 1

[0030] An embodiment of the present invention provides a pulsed thulium-doped fiber laser, which includes: pump source 1, pump coupling device 2, first 1.5 μm fiber grating 3, erbium-doped active fiber 4, high-reflective thulium-doped fiber laser Fiber Bragg grating 5, Thulium-doped active fiber 6, Thulium-doped fiber laser output fiber Bragg grating 7, second 1.5μm Fiber Bragg grating 8;

[0031] Among them, the pump source 1 is a fiber-coupled multimode semiconductor laser with a wavelength of 976 nm and a fiber core diameter of 100 μm; the pump coupling device 2 is a signal-pump combiner with a pump pigtail core diameter of 100 μm, and the pump source The optical fiber specifications of 1 are matched, and the signal port optical fiber is a single-mode double-clad optical fiber; the first 1.5 μm fiber grating 3 has a high reflectivity for the 1560nm wavelength corresponding to the Tm ion absorption peak in the erbium ion emission spectrum, and the reflectivity is greater than...

Embodiment 2

[0036] In the above-mentioned embodiment 1, the erbium-doped active fiber can be a single erbium-doped fiber, or an erbium-ytterbium co-doped fiber, as long as the gain at the 1.5 μm absorption band corresponding to the thulium-doped active fiber 6 can be provided, the present invention The embodiment does not limit this.

[0037] The pumping source 1 can be a multimode semiconductor laser, or a single transverse mode semiconductor laser or other types of lasers, and the pumping wavelength can be 976nm or 915nm, as long as it corresponds to the pumping of the erbium-doped active fiber 4 The Pu absorption band is sufficient, which is not limited in this embodiment of the present invention.

[0038]Correspondingly, if the pump source 1 is a single transverse mode pump source, the corresponding pump coupling device 2 is a wavelength division multiplexer (WDM) or other type of single-mode coupling device, which is not limited in the embodiment of the present invention .

[0039]...

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Abstract

The invention discloses a pulse thulium-doped fiber laser device, which is characterized in that a thulium-doped active optical fiber is arranged in a resonant cavity of a 1.5 [mu]m band erbium-doped (Er<3+>) optical fiber laser device, the 1.5 [mu]m band erbium-doped (Er<3+>) fiber laser device can operate in a passive Q-switched pulse mode due to the fact that the thulium-doped active optical fiber has a saturable absorption effect on 1.5 [mu]m band laser emitted by the erbium-doped optical fiber, and the process that the thulium-doped optical fiber absorbs laser in the 1.5 [mu]m wave band so as to make the erbium-doped optical fiber laser device operate in a pulse mode is the process that the thulium-doped optical fiber absorbs pump light to generate 1.7-2 [mu]m laser gain based on transition from 3F4 to 3H6; and the 1.5 [mu]m wave band laser runs in a passive Q-switched nanosecond (ns) pulse form, so that the thulium-doped fiber laser device works in a gain switch mode, and 1.7-2 [mu]m wave band pulse laser output which is narrower than the 1.5 [mu]m laser pulse width and higher in peak power can be generated.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a pulsed thulium-doped fiber laser. Background technique [0002] Thulium-doped fiber laser is the main technical way to obtain laser output in the 1.7-2μm band. For application scenarios that require high peak power lasers, it is necessary to try to achieve pulsed operation of the laser to increase the peak power. Common methods for realizing nanosecond (ns) pulsed lasers include: active Q-switching methods such as acousto-optic and electro-optic methods, and passive Q-switching methods such as saturable absorption, but both require the introduction of additional Q-switching devices, which increases the cost and complexity of the laser system sex [1] . In addition to active and passive Q-switching methods, the pulse output of thulium-doped fiber lasers can also be realized based on gain switching methods [2] : Thulium-doped active fiber is pumped with ns pulsed pump light. Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/08H01S3/067H01S3/094
CPCH01S3/094042H01S3/094003H01S3/06708H01S3/08013
Inventor 盛泉张钧翔张露史伟姚建铨
Owner TIANJIN UNIV
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