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Principle and characteristics of short pulse fiber laser

Principle and characteristics of short pulse fiber laser

  • Categories:fiber laser News
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  • Time of issue:2021-07-16 15:14
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(Summary description)Short pulse fiber laser mainly uses rare-earth-doped fiber as the gain medium. The rare-earth ions doped in the more mature active fiber include Er, Yb, Nd, Pr, Tm, and Ho. Short pulse fiber laser is composed of pump source, gain medium and cavity mirror.

Principle and characteristics of short pulse fiber laser

(Summary description)Short pulse fiber laser mainly uses rare-earth-doped fiber as the gain medium. The rare-earth ions doped in the more mature active fiber include Er, Yb, Nd, Pr, Tm, and Ho. Short pulse fiber laser is composed of pump source, gain medium and cavity mirror.

  • Categories:fiber laser News
  • Author:
  • Origin:
  • Time of issue:2021-07-16 15:14
  • Views:
Information

Short pulse fiber laser mainly uses rare-earth-doped fiber as the gain medium. The rare-earth ions doped in the more mature active fiber include Er, Yb, Nd, Pr, Tm, and Ho. Short pulse fiber laser is composed of pump source, gain medium and cavity mirror. Among them, the pump light emitted by the LD enters the fiber through the fiber coupler to excite the doped element atoms in the fiber. The cavity mirror is a dichroic mirror, which reflects and outputs laser light, and enhances the transmission of the pump light. Like solid-state lasers, short pulse fiber lasers also generate short pulse laser output based on the principle of mode locking.

Short pulse fiber laser

When the short pulse fiber laser operates on a large number of longitudinal modes in the gain bandwidth, when the phases of the longitudinal modes are synchronized, and the phase difference between any adjacent longitudinal modes is constant, mode locking is realized, and the single pulse circulating in the resonant cavity outputs energy through the output coupler. . According to different mode locking methods, it can be divided into active mode locking Short pulse fiber laser and passive mode locking fiber laser. Due to the limited ability of active mode-locked modulation, the width of the mode-locked pulse is limited, and the pulse width is usually on the order of ps. Passive mode-locked or self-mode-locked fiber lasers use nonlinear optical effects in fibers or other components to achieve mode-locking. The laser has a simple structure. Under certain conditions, it can realize self-starting mode-locking without inserting any modulation elements.

Usually self-starting passive mode-locking Short pulse fiber laser can output ultra-short pulses of the order of fs. Traditional solid-state lasers composed of bulk working materials and various optical components have disadvantages such as large volume, large mass, loose structure, and poor reliability.

The Short pulse fiber laser has the following characteristics: (1) The gain medium is long, which can easily extend the gain length to fully absorb the pumping light, and the light-to-light conversion efficiency exceeds 60%; (2) The short pulse fiber laser has a large surface area/volume ratio. , The thermal load of its working substance is quite small, the field in the optical fiber is mainly confined in the core, so that the field strength in the core is very large, and the low loss of the optical fiber enables this high light intensity to be maintained for a long distance, which can produce very High brightness and very high peak power; (3) Easy to realize single-mode, single-frequency operation and ultra-short pulse; (4) Short pulse fiber laser is small in size and simple in structure, and the working material is a flexible medium, which is convenient to use; (5) Laser It can be designed and operated in a wide spectrum range, making the Short pulse fiber laser adjustable.

Because of the above characteristics of Short pulse fiber laser, the use of optical fiber as an oscillator to generate ultra-short pulse laser has more advantages than traditional solid-state laser amplifiers.
 

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