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Saturable absorber with saturable absorption and anti-saturable absorption characteristics and application thereof

A technology with saturable absorption and absorption characteristics, which is applied in the field of fiber laser, can solve the problems that the pulse energy and peak power cannot be effectively improved, the optical conversion efficiency is low, and the repetition frequency is increased, so as to achieve single pulse energy and peak power, passive modulation Effects of Q pulse output optimization and output characteristic optimization

Active Publication Date: 2021-08-27
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The difficulty in solving the above problems and defects is: reducing the pulse width will increase the repetition rate, and the pulse energy and peak power cannot be effectively improved. Due to the unreasonable increased loss, the optical conversion efficiency is very low.

Method used

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  • Saturable absorber with saturable absorption and anti-saturable absorption characteristics and application thereof
  • Saturable absorber with saturable absorption and anti-saturable absorption characteristics and application thereof
  • Saturable absorber with saturable absorption and anti-saturable absorption characteristics and application thereof

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preparation example Construction

[0060] The embodiment of the present invention provides Fe 3 o 4 -PI composite film preparation method (such as Figure 9 ) includes the following steps:

[0061] S101, dilute 20wt.% liquid PI with N-methylpyrrolidone;

[0062] S102, add 1mg / mL Fe 3 o 4 The nanoparticle aqueous solution was mixed with the PI solution at a ratio of 1:3, 1:4, and 1:5, and the mixture was ultrasonically treated for 1 hour at a power of 50W to obtain a homogeneous mixture;

[0063] S103, drop the prepared mixture evenly on the surface of the glass substrate, and evaporate it at 60°C for 10 hours to obtain Fe 3 o 4 Fe with volume ratios of 1:3, 1:4 and 1:5 to PI 3 o 4 -PI film.

Embodiment 1

[0066] The first object of the present invention is to provide a Q-switched fiber laser whose output characteristics are greatly optimized. At the same time, the pulse width and repetition frequency are compressed, and the single pulse energy and peak power are increased at the same time. The start-up threshold of the Q switch is low, the light-to-light conversion efficiency is very high, and the stability of the Q-switched pulse is strong.

[0067] The second object of the present invention is to provide a passive Q-switched fiber laser based on a saturable absorber combining saturable absorption and reverse saturable absorption.

[0068] The third object of the present invention is to provide a two-dimensional material Fe 3 o 4 Preparation method of nanoparticle-polyimide (PI) film. The preparation method of the thin film is simple and the cost is low.

[0069] The technical solution adopted in the present invention is a passive Q-switched fiber laser device based on a sa...

Embodiment 2

[0082] Embodiment 2: SEM and DES are measured by scanning electron microscope (JEM-6700F)

[0083] A passive Q-switched fiber laser device with narrow pulse width and low repetition rate, including 980nm LD pump source, 980nm / 1550nm wavelength division multiplexer, 10% output coupler, erbium-doped gain fiber, polarization-independent isolator, single Mode Fiber, Polarization Controller, Fe 3 o 4 -PI composite film.

[0084] Preparation method: (1) Take 10 mL of N-methylpyrrolidone and 20 mL of 20wt.% liquid PI. Dilute 20wt.% liquid PI with N-methylpyrrolidone, stir well and put it under the power of 70W for 30min sonication, the volume ratio of N-methylpyrrolidone and liquid PI used is 1:2. (2) Fe 3 o 4 Nanoparticles were purchased from Pioneer Nano, with an average diameter of 50 nm, Fe 3 o 4 After mixing 5 mg of nanoparticles and 5 mL of aqueous solution, sonicate for 30 min at a power of 50 mW to prepare Fe 3 o 4 Nanoparticle aqueous solution will Fe 3 o 4 Nanopa...

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Abstract

The invention belongs to the technical field of fiber laser, and discloses a saturable absorber with saturable absorption and anti-saturable absorption characteristics, application thereof and a passive Q-switched fiber laser device, and the saturable absorber comprises a 980nm LD pumping source, a 980nm / 1550nm wavelength division multiplexer, a 10% output coupler, an erbium-doped gain fiber, a polarization independent isolator, a single-mode fiber, a polarization controller and a Fe3O4-PI composite film, wherein the Fe3O4-PI composite film is cut into a square with the side length of 0.5 mm and then placed on the optical fiber jumper head. According to the passive Q-switched fiber laser, the output characteristics of the passive Q-switched fiber laser are adjusted and optimized through the saturable absorber with saturable absorption and anti-saturable absorption characteristics, the output characteristics of the passive Q-switched fiber laser are greatly optimized, the pulse width and the repetition frequency are compressed, meanwhile, the monopulse energy and the peak power are improved, the output performance of the passive Q-switched fiber laser is improved, and the Q-switched pulse is high in stability.

Description

technical field [0001] The invention belongs to the field of optical fiber laser technology, in particular to a saturable absorber with saturable absorption and reverse saturable absorption characteristics and its application. Background technique [0002] At present, stable ultrafast pulsed fiber lasers, with good heat dissipation, low cost and small weight, have been widely used and developed in laser cutting, laser communication and medical fields. Due to the higher pulse energy and peak power of the stabilized pulsed fiber laser, its pulse width is also shorter, which also makes it superior to the continuous wave laser. These properties make it very important in laser processing and nonlinear optics. [0003] Existing passively Q-switched fiber lasers are mainly realized by using two-dimensional materials as saturable absorbers. Although many new saturable absorbers have emerged in recent years, and pulsed fiber laser technology has developed very rapidly, there is sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/106H01S3/11H01S3/113
CPCH01S3/067H01S3/1061H01S3/1115H01S3/113
Inventor 徐英添许崇阳张贺金亮李岩李卫岩邹永刚
Owner CHANGCHUN UNIV OF SCI & TECH
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