Laser

Abstract

The invention provides a laser, which comprises at least one pump light emitting device, an optical fiber beam combiner, a grain optical fiber, a first aligner, a mold locking device, a second aligner and an output lens, wherein a first polarization beam-splitting device is arranged between the first aligner and the mold locking device on the laser; a second polarization beam-splitting device is arranged between the second aligner and the output lens on the laser; adjacent optical devices are connected by adopting polarization-preserving optical fibers. The laser having a polarization-preserving optical fiber structure is high in stability. Linearly polarized light is transmitted through the polarization-preserving optical fibers, so that the influence of vibration on a light path caused by temperature change is avoided. Moreover, the mold locking device can be used for stably absorbing a part of energy and reflecting laser pulse generated after stable mold locking through the polarization beam-splitting devices.

Description

technical field [0001] The invention relates to a laser, in particular to a fiber laser for outputting mode-locked laser pulses. Background technique [0002] Fiber laser refers to a laser that uses rare earth element-doped glass fiber as the gain medium. Under the action of pump light, it is easy to form a high power density in the fiber, and then cause the laser energy level transition of the laser working material, and then pass through the resonator. Laser oscillation output. [0003] Fiber laser has a wide range of applications. It has the advantages of small size, light weight, high conversion efficiency, and good output beam quality. It has developed rapidly in recent years, especially in laser optical fiber communication, laser space remote communication, industrial shipbuilding, automobile manufacturing, Laser engraving, laser marking, laser cutting, printing rollers, metal and non-metal drilling, cutting, welding, military defense security, medical equipment, larg...

AI Technical Summary

Problems solved by technology

[0005] However, the existing resonant cavity transmits the optical path through the atmospheric space, and at the same time, the light input into the collimator by the pump light through the gain fiber is usually not pulsed polarized light containing different polarization states, which then makes the collimator to The output of the semiconductor saturable absorber mirror is pulsed polarized light with different polarization states

Because the semiconductor saturable absorbing mirror has different degrees of saturation absorption for pulsed light of different polarization states, the semiconductor saturable absorbing mirror has different degrees of absorption for pulsed polarized light of different polarization states, and then different degrees of loss of the pulsed light , making the semiconductor saturable absorbing mirror output unstable pulsed light

At the same time, most of the existing lasers use atmospheric space as the laser propagation medium, which is easily affected by the vibration caused by temperature changes, and is easily disturbed by the external environment. The high optical loss makes the output beam quality of the laser unstable.

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