Saturable absorber with saturable absorption and anti-saturable absorption properties and its application

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: 2022-05-20
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 properties and its application
  • Saturable absorber with saturable absorption and anti-saturable absorption properties and its application
  • Saturable absorber with saturable absorption and anti-saturable absorption properties and its application

Examples

Experimental program
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preparation example Construction

[0060] Embodiments of the present invention provide Fe3 O 4 -PI composite film preparation method (e.g., . Figure 9 This includes the following steps:

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

[0062] S102, place 1 mg / mL of Fe 3 O 4 The aqueous nanoparticle solution and pi solution were mixed in the ratio of 1:3, 1:4 and 1:5, respectively, and the mixture was sonicated at 50W power for 1h to obtain a homogeneous mixture;

[0063] S103, the prepared mixture was evenly dripped on the surface of the glass substrate, and evaporated at 60 °C for 10h to obtain Fe 3 O 4 Fe with PI has a volume ratio of 1:3, 1:4 and 1:5, respectively 3 O 4 -PI film.

Embodiment 1

[0066] A first object of the present invention is intended to provide a Q-modulated fiber laser, the output characteristics of the Q-modulated fiber laser has been greatly optimized. At the same time, the pulse width and repetition rate are compressed, and the single pulse energy and peak power are improved at the same time, the starting threshold of the Q switch is low, the optical conversion efficiency is very high, and the Q pulse stability is strong.

[0067] A second object of the present invention is intended to provide a passive Q-modulated fiber laser based on a saturated absorber combined with saturated absorption and reverse saturation absorption.

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

[0069] The technical embodiment employed in the present invention is, a passive Q-modulated fiber ...

Embodiment 2

[0082]Example 2: SEM and DES by scanning electron microscopy (JEM-6700F) assay

[0083] A passive Q-modulated fiber laser device with narrow pulse width and low repetition rate, including a 980nm LD pump source, a 980nm / 1550nm wavelength division multiplexer, a 10% output coupler, an erbium-doped gain fiber, a polarization independent isolator, a singlemode fiber, a polarization controller, and a Fe 3 O 4 -PI composite film.

[0084] Preparation Method: (1) Take 10mL of N-methylpyrrolidone and 20mL of 20wt.% liquid PI. Dilute the 20wt.% liquid PI with N-methylpyrrolidone, stir well and place it at 70W power for sonication for 30min, the volume ratio of N-methylpyrrolidone and liquid PI used is 1:2. (2) Fe 3 O 4 Nanoparticles are purchased from Pioneer Nano, with an average diameter of 50 nm, taken Fe 3 O 4 After mixing the nanoparticles 5 mg and the aqueous solution 5 mL at a power of 50 mW for 30 min, Fe will be prepared 3 O 4 Nanoparticle aqueous solution will Fe 3 O 4 The aqueo...

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Abstract

The invention belongs to the field of fiber laser technology, and discloses a saturable absorber with saturable absorption and reverse saturable absorption characteristics and its application, a passive Q-switched fiber laser device, including 980nm LD pump source, 980nm / 1550nm wavelength division multiplexing 10% output coupler, erbium-doped gain fiber, polarization independent isolator, single-mode fiber, polarization controller, Fe 3 o 4 ‑PI composite film; wherein, the Fe 3 o 4 ‑PI composite film is cut into squares with a side length of 0.5mm and placed on the fiber jumper head. The invention realizes the device for adjusting and optimizing the output characteristics of the passive Q-switched fiber laser through the saturable absorber with saturable absorption and anti-saturated absorption characteristics, the output characteristics of the Q-switched fiber laser have been greatly optimized, compression Pulse width and repetition frequency, while improving single pulse energy and peak power, Q-switched pulse stability is strong.

Description

Technical field [0001] The present invention belongs to the field of fiber laser technology, in particular to a saturated absorber having saturatible absorption and anti-saturation absorption characteristics and applications thereof. Background [0002] At present, stable ultrafast pulse fiber lasers, with good heat dissipation, low cost, small weight, have been widely used and developed in laser cutting, laser communication and medical fields. Because stable pulse fiber lasers have higher pulse energy and peak power, their pulse width is also shorter, which also makes them superior to CW lasers. These properties make it very important in laser processing and nonlinear optics. [0003] Existing passive Q-modulated fiber lasers are mainly achieved by means of two-dimensional materials as saturatable absorbers. Although many new saturated absorbers have emerged in recent years, and pulsed fiber laser technology has developed very rapidly, there is still a lot of research space for ...

Claims

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Application Information

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Patent Type & Authority Patents(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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