A saturable absorber based on tungsten ditelluride/tungsten disulfide heterojunction and its preparation method and mode-locked fiber laser made therefrom
A saturable absorption, fiber laser technology, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of ineffective compression of pulse width, long exciton decay time, etc., to achieve narrow pulse width, convenient operation, The effect of stable quality
Active Publication Date: 2021-12-10
GUANGDONG UNIV OF TECH
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Problems solved by technology
[0004] WS 2 As a new type of two-dimensional material, it has been widely confirmed that it can be used as a saturable absorber to generate ultrashort pulse laser, but WS 2 The long exciton decay time makes it impossible to effectively compress the pulse width, and usually only sub-nanosecond and picosecond pulsed lasers can be obtained
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Embodiment 1
[0032] Step 1: Prepare a W thin film on a quartz substrate by magnetron sputtering. Specifically, a W polycrystalline block is used as a target, the radio frequency power is 80W, the sputtering pressure is 1.2Pa, the Ar flow rate is 50sccm, and the quartz substrate is Heating to 100°C, continuous deposition for 30min; placing the W film produced by magnetron sputtering in the downstream of a tube furnace with two temperature zones, passing Ar as a protective gas at a flow rate of 100 sccm; Place high-purity sulfur powder in the zone, and set the temperature at 200°C, set the temperature in the downstream high-temperature zone at 1100°C, keep it for 3 hours and then cool it down to room temperature naturally, and get WS 2 film;
[0033] Step 2: The WS prepared in the above step 1 2The thin film is used as the substrate, and the W thin film is sputtered again by the magnetron sputtering method. The parameters are the same as the above steps; 100 sccm; and place high-purity tel...
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Abstract
The invention belongs to the technical field of passive mode-locked fiber lasers, and discloses a saturable absorber based on a tungsten ditelluride / tungsten disulfide heterojunction, a preparation method and a mode-locked fiber laser produced therefrom. The method is to prepare a W thin film on a quartz wafer as a substrate by magnetron sputtering, and then prepare WS on the substrate by CVD. 2 Thin film; then in the same way in WS 2 WTe 2 , forming WTe 2 / WS 2 The heterojunction is then etched by a strong alkaline solution to give WTe 2 / WS 2 heterojunction films. Mode-locked fiber lasers include pump sources, wavelength division multiplexers, doped fibers, single-mode fibers, optical isolators, fiber couplers, polarization controllers, and WTe 2 / WS 2 A heterojunction saturable absorber constitutes a ring cavity laser. The saturable absorber of the invention has good stability, is not easy to be oxidized, can be used for laser mode locking for a long time, and the performance of the mode locking laser based on the material is stable.
Description
technical field [0001] The invention belongs to the technical field of passive mode-locked fiber lasers, in particular to a tungsten ditelluride / tungsten disulfide (WTe 2 / WS 2 ) heterojunction saturable absorber and its preparation method and the mode-locked fiber laser made therefrom. Background technique [0002] Ultrashort pulse (picosecond and femtosecond level) lasers, compared with traditional long pulse (microsecond and nanosecond level) lasers, basically do not cause any thermal damage to the surrounding materials during use. Therefore, ultrashort pulse laser has important research and application value in precision machining, surgical medical treatment, scientific research and other fields. In particular, ultrashort pulse fiber lasers have multiple advantages such as simple structure, stable light output performance, maintenance-free, and easy to carry, and have become the preferred high-tech tools for all walks of life. [0003] Passive mode-locking technology ...
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IPC IPC(8): H01S3/098H01S3/067C23C14/18C23C14/35C23C14/58
CPCH01S3/1118H01S3/067C23C14/185C23C14/35C23C14/5866C23C14/0005
Inventor 何朋飞陶丽丽
Owner GUANGDONG UNIV OF TECH