Passive mode-locked fiber laser device

Abstract

The invention relates to a passive mode-locked fiber laser device which includes a laser pumping source and a unidirectional annular resonant cavity. The unidirectional annular resonant cavity includes a wavelength division multiplexer, an Er doped fiber, a first optical-fiber collimator, a second optical-fiber collimator, a first 1/4 glass slide, a second 1/4 glass slide, a photoisolator, a bandpass filter, a polarization beam splitter and a 1/2 glass slide. The passive mode-locked fiber laser adopts nonlinear polarization rotation mode locking and utilizes the highly doped optical fiber as a gain medium so that the length of a laser cavity is reduced and the repeating frequency of the laser device is increased. Through introduction of the bandpass filter into the laser cavity, stray components and noises in the cavity are filtered so that clock jitter resulted from quantum noises is reduced. Through management of chromatic dispersion of the laser cavity, narrower pulses can be generated and wider frequency spectrum can also be obtained and intensity noises of the laser device are also reduced so that the passive mode-locked laser device is widely applicable to the field of optical-analog-digital system (OAD).

Description

technical field [0001] The invention relates to the field of optical information technology, in particular to a passive mode-locked fiber laser with high repetition rate and low clock jitter. Background technique [0002] Fiber laser is a subject of in-depth research and development by researchers from various countries in recent years. The performance of fiber laser has reached or even surpassed the traditional large solid-state laser in some aspects. Because fiber laser has the characteristics of small size, low cost, easy operation and high stability, It has replaced traditional solid-state lasers in some applications, such as those requiring continuous light or Q-switched output. In the range of 1.0 μm and 1.5 μm, the research on increasing the laser repetition rate and pulse energy has made great progress. High repetition rate, low clock jitter fiber lasers have a wide range of applications, such as optical analog-to-digital conversion systems (OAD), frequency comb gen...

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Problems solved by technology

However, the clock jitter of the output pulses of these lasers is generally relatively large, and most of the lasers wor

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