Dual-wavelength synchronous pulsed fiber laser based on rare earth ions co-doped fiber

Patent metadata

Field	Value
Publication number	US-10734779-B2
Application number	US-201916361225-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Nov 1, 2016
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

The present application is applicable to laser technology field and provides a dual-wavelength synchronous pulsed fiber laser based on rare earth ions co-doped fiber, which includes a continuous light LD pumping source, a rare earth ions co-doped fiber and two resonant cavities. Sensitizing ions in the rare earth ions co-doped fiber absorb the pumping light and radiate laser of one wavelength. Meanwhile, sensitized ions in the rare earth ions co-doped fiber radiate laser of another wavelength. Laser generated by sensitizing ions is subjected to Q-switching or mode locking with the saturable absorber inserted in the cavity to generate pulsed laser. Generation and partial reabsorption for the pulsed laser modulates gain of the laser radiated by sensitized ions periodically and generates synchronous pulsed laser, thereby implementing a dual-wavelength synchronous pulsed fiber laser.

First claim

What is claimed is:

1. A dual-wavelength synchronous pulsed fiber laser based on rare earth ions co-doped fiber, wherein said dual-wavelength synchronous pulsed fiber laser comprises a continuous light LD pumping source, a rare earth ions co-doped fiber and two resonant cavities, said continuous light LD pumping source is connected with common part of said two resonant cavities, said rare earth ions co-doped fiber is common gain medium of said two resonant cavities for absorbing pumping light emitted from said continuous light LD pumping source and radiating lasers, and said two resonant cavities are two linear cavities or two ring cavities; a first one of said two resonant cavities constitutes a guiding resonant cavity for laser radiated by sensitizing ions, and a second one of said two resonant cavities constitutes a guided resonant cavity for laser radiated by sensitized ions, and a saturable absorber which functions only to laser radiated by sensitizing ions is inserted in a first one of said resonant cavities,
wherein said linear cavities contain therein a broadband mirror, the saturable absorber, a pumping coupling device, a rare earth ions co-doped fiber, a fiber wavelength division multiplexer WDM 1 , an optical delay line DL 1 , a fiber Bragg grating FBG 1 and a fiber Bragg grating FBG 2 ;
said linear cavities comprise a first linear cavity and a second linear cavity, wherein said first linear cavity contains therein the broadband mirror, the saturable absorber, the pumping coupling device, the rare earth ions co-doped fiber, the fiber wavelength division multiplexer WDM 1 and the fiber Bragg grating FBG 1 in sequential connection, said second linear cavity contains therein the broadband mirror, the saturable absorber, the pumping coupling device, the rare earth ions co-doped fiber, the fiber wavelength division multiplexer WDM 1 , the optical delay line DL 1 and the fiber Bragg grating FBG 2 in sequential connection; and said continuous light LD pumping source is connected with said linear cavity via said pumping coupling device;
said first linear cavity and said second linear cavity are connected via said fiber wavelength division multiplexer WDM 1 ,
when said rare earth ions co-doped fiber has a single cladding, said pumping coupling device is a tri-wavelength fiber wavelength division multiplexer with a signal fiber capable of transmitting both lasers radiated by sensitizing ions and sensitized ions, and said continuous light LD pumping source acts as a single mode pigtail output;
when said rare earth ions co-doped fiber has double claddings, said pumping coupling device is a fiber beam combiner, and said continuous light LD pumping source acts as a multi-mode pigtail output,
wherein said dual-wavelength synchronous pulsed fiber laser further comprises, following said resonant cavity, an optical delay line DL 2 , a fiber wavelength division multiplexer WDM and an output terminal in sequential connection.

2. The dual-wavelength synchronous pulsed fiber laser of claim 1 , wherein said broadband mirror is one of a dielectric mirror, a metal mirror and a fiber mirror.

3. The dual-wavelength synchronous pulsed fiber laser of claim 1 , wherein said fiber Bragg grating FBG 1 has a central wavelength of Bragg reflection corresponding to a wavelength of laser as radiated by sensitizing ions and a transmissivity of 5% to 80% for said wavelength; said fiber Bragg grating FBG 2 has a central wavelength of Bragg reflection corresponding to a wavelength of laser radiated by sensitized ions and a transmissivity of 5% to 80% for said wavelength.

4. The dual-wavelength synchronous pulsed fiber laser of claim 1 , wherein said ring cavity contains therein the fiber wavelength division multiplexer WDM 1 , the pumping coupling device, the rare earth ions co-doped fiber, the fiber wavelength division multiplexer WDM 2 , an optical fiber coupler OC 1 , a fiber polarization-independent isolator ISO 1 and the saturable absorber, an optical fiber coupler OC 2 , a fiber polarization-independent isolator ISO 2 and the optical delay line DL 1 ;
said ring cavity comprises a first ring cavity and a second ring cavity, wherein said first ring cavity contains therein the fiber wavelength division multiplexer WDM 1 , the pumping coupling device, the rare earth ions co-doped fiber, the fiber wavelength division multiplexer WDM 2 , the optical fiber coupler OC 1 , the fiber polarization-independent isolator ISO 1 and the saturable absorber in sequential connection, and said second ring cavity contains therein the fiber wavelength division multiplexer WDM 1 , the pumping coupling device, the rare earth ions co-doped fiber, the fiber wavelength division multiplexer WDM 2 , the optical fiber coupler OC 2 , the fiber polarization-independent isolator ISO 2 and the optical delay line DL 1 in sequential connection, wherein said continuous light LD pumping source is connected with said ring cavity via said pumping coupling device;
and said first ring cavity and said second ring cavity are connected each other via said fiber wavelength division multiplexer WDM 1 and said fiber wavelength division multiplexer WDM 2 .

5. The dual-wavelength synchronous pulsed fiber laser of claim 4 , wherein said artificial saturable absorber is a nonlinear polarization rotation structure constituted by a fiber polarization controller PC 1 , a fiber polarizer and a fiber polarization controller PC 2 in sequential connection.

6. The dual-wavelength synchronous pulsed fiber laser of claim 1 , wherein said rare earth ions co-doped fiber is a single cladding Erbium-Ytterbium co-doped optical fiber or a dual-cladding Erbium-Ytterbium co-doped optical fiber.

Assignees

• Univ Shenzhen

Inventors

• Guo Chunyu
• Liu Weiqi
• Ruan Shuangchen
• Yu Jun
• Chen Yewang
• Luo Ruoheng
• Zhu Yihuai

Classifications

• H01S3/1698

  rare earth · CPC title

• H01S3/094026

  for synchronously pumping, e.g. for mode locking · CPC title

• H01S3/113

  using intracavity saturable absorbers · CPC title

• H01S3/082

  defining a plurality of resonators, e.g. for mode selection or suppression · CPC title

• H01S3/1618

  ytterbium · CPC title