Pulse Width Tunable Pulsed Fiber Laser Based on Broadband Seed Source

Abstract

The invention discloses a pulse-width-adjustable pulsed optical fiber laser device based on a broadband seed resource. The device includes an optical-path module (1) and a circuit module (2). The optical-path module (1) includes the broadband seed resource (3), a first optical fiber amplifying device (4), an acousto-optical / electro-optical switch (6), more than one second optical fiber amplifying device (7) and a collimation optical isolator (8), which are coaxially connected sequentially. The circuit module (2) includes a pump drive circuit (9), an acousto-optical / electro-optical drive circuit (10), an output control circuit (11) and a protection circuit (12). The acousto-optic / electro-optical drive circuit (10) is connected electrically with the acousto-optical / electro-optical switch (6). The pulse-width-adjustable pulsed optical fiber laser device has the advantages of flexible adjustability of pulse width so that application of the laser device is more flexible and the laser device also has the advantages of high power and great stability.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a pulse width adjustable pulse fiber laser based on a broadband seed source, belonging to the field of laser equipment. Background technique [0002] The traditional pulsed fiber laser is characterized by the addition of a modulator modulation device in the resonator, so the output laser is output in the form of high-energy pulses. The traditional fiber laser has the following two disadvantages: [0003] Disadvantage 1: The spectral bandwidth of traditional fiber lasers is narrow, and the threshold power of Stimulated Brillouin Scattering (SBS) is low. In the case of a certain pulse peak power, it is easy to generate nonlinear SBS, which can be amplified to produce extremely high The peak power causes the fiber to burn, which is one of the fundamental reasons why it is difficult to achieve high power and poor reliability for Q-switched pulsed fiber lasers at home and abroad. [0004] Disadvantag...

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Problems solved by technology

[0003] Disadvantage 1: The spectral bandwidth of traditional fiber lasers is narrow, and the threshold power of Stimulated Brillouin Scattering (SBS) is low. In the case of a certain pulse peak power, it is easy to generate nonlinear SBS, which can be amplified to produce extremely high The peak power causes the fiber to burn, which is one of the fundamental reasons why it is difficult to achieve high power and poor reliability for Q-switched pulsed fiber lasers at home and abroad.

[0004] Disadvantage 2: Traditional Q-switched fiber lasers insert a Q-switched modulator in the resonator to achieve pulse output. Since the pulse width is proportional to the length of the laser resonator cavity, traditional Q-switched fiber lasers can only achieve pulse output with a fixed pulse width. , the pulse width of the laser pulse cannot be adjusted, which limits the application flexibility of the pulsed fiber laser

If users use traditional pulsed fiber lasers to process materials with different characteristics, in order to achieve better results, they must be equipped with different lasers, which greatly increases the cost. If the processing platform is shared, the laser needs to be replaced, which affects the processing efficiency.

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