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Saturable absorber based on palladium telluride, preparation method and mode-locked fiber laser prepared from saturable absorber

A technology of saturable absorption and fiber lasers, applied in the field of passive mode-locked ultrafast fiber lasers, which can solve the problems of low optical damage threshold, easy oxidation, poor stability, etc.

Pending Publication Date: 2021-04-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in these new saturable absorber materials. Graphene has ultra-fast exciton recovery time and single-layer graphene even has broadband saturable absorption characteristics, but due to the weak light absorption of graphene, the modulation performance is not good. Stablize
Black phosphorus is a saturated absorber with broadband absorption and high carrier mobility characteristics, but it is easily oxidized in air and has poor stability
Semiconductor saturable absorber is currently the most mature saturable absorber in commercial use, but it also has many disadvantages, including complex preparation process, high price, long recovery time, difficult to control modulation depth, low optical damage threshold, etc.
Transition metal sulfides, such as tungsten sulfide and molybdenum sulfide, have a long exciton recovery time, which is not conducive to the generation of ultrafast pulses
Moreover, the band gap of transition metal sulfides is generally between 0.7eV and 2.2eV, and it is difficult to apply them in the mid-infrared region.

Method used

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  • Saturable absorber based on palladium telluride, preparation method and mode-locked fiber laser prepared from saturable absorber
  • Saturable absorber based on palladium telluride, preparation method and mode-locked fiber laser prepared from saturable absorber
  • Saturable absorber based on palladium telluride, preparation method and mode-locked fiber laser prepared from saturable absorber

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Embodiment 1

[0030] Step 1: Put 20 mg of palladium ditelluride powder into 40 milliliters of N-methylpyrrolidone (NMP) solution, sonicate for 36 hours in a high-power (400W) continuous ultrasonic cleaner, then centrifuge at 2000 rpm for 3 minutes, remove palladium ditelluride nanosheets with more layers, and take the supernatant to obtain a solution of palladium ditelluride nanosheets.

[0031] Step 2: Take 3 milliliters of the palladium ditelluride nanosheet solution obtained above, then put 1 milliliter of 4wt% polyvinyl alcohol (PVA) solution into ultrasonic vibration for 5 minutes to make it mix evenly, and then pour the mixed solution into a disposable petri dish and placed in a drying oven to dry at 60°C for more than 24 hours, and the film was taken out with tweezers after cleaning with alcohol to obtain a saturable absorber based on palladium ditelluride, which was cut into small pieces of 2×2mm, and then Transfer to fiber end face.

[0032] Such as figure 1 As shown, the mode-lo...

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Abstract

The invention belongs to the technical field of passive mode-locked ultrafast fiber lasers, and discloses a saturable absorber based on palladium telluride, a preparation method and a mode-locked fiber laser prepared from the saturable absorber. The preparation method of the saturable absorber based on palladium ditelluride comprises the following steps: stripping by a liquid phase stripping method, fusing with polyvinyl alcohol, drying to form a composite film, cutting the composite film into small pieces, transferring to the end surface of an optical fiber jumper, connecting with another optical fiber jumper by a flange plate, and transferring to the end surface of the optical fiber jumper, connecting with another optical fiber jumper through a flange plate, arranging in the optical fiber flange, and generating picosecond-level ultrashort pulse laser. The saturable absorber based on palladium telluride is small in size, simple in preparation method, wide in working wavelength and short in recovery time, industrial production can be achieved, and the ultrashort pulse laser based on the material is stable in performance.

Description

technical field [0001] The invention belongs to the technical field of passive mode-locked ultrafast fiber lasers, in particular to a saturable absorber based on palladium ditelluride, a preparation method and a mode-locked fiber laser made thereof. Background technique [0002] Ultrashort pulse fiber laser can generate (picosecond or femtosecond) level pulse width and obtain ultrahigh peak power at lower average power, which is an important technology for basic scientific research and industrial applications. At this stage, ultrafast lasers have been widely used in biomedical diagnosis and treatment, ultra-precision machining, ultra-precision ranging and other fields. Compared with other lasers, fiber lasers also have the advantages of low threshold, high gain, high conversion efficiency and good output beam quality, and have become the preferred high-tech tools for all walks of life. [0003] Passive mode-locking technology is one of the main technical means to generate u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/098H01S3/067B82Y30/00B82Y40/00
Inventor 卢海明陶丽丽
Owner GUANGDONG UNIV OF TECH
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