Novel single-frequency pulse blue laser light source based on 978nm single-frequency pulse fiber laser

Abstract

The invention discloses a novel single-frequency pulse blue laser light source based on 978nm single-frequency pulse fiber laser. The novel single-frequency pulse blue laser light source is characterized by comprising a linear-polarization single-frequency Q-switching pulse-type 978nm all-fiber laser device, a collimator, a wave plate, a focusing lens, a nonlinear crystal and a dichroic mirror; a signal end of the linear-polarization single-frequency Q-switching pulse-type 978nm all-fiber laser device is connected with the collimator; the 978nm single-frequency pulse laser is collimated and outputted to be connected with the wave plate; the other end of the wave plate is connected with the focusing lens; the 978nm linearly-polarized single-frequency pulse laser is focused through the focusing lens and then is subjected to frequency doubling through the nonlinear crystal, then the remaining 978nm laser is filtered via the dichroic mirror, and single-frequency pulse-type blue laser is outputted. The novel single-frequency pulse blue laser light source has a significant application value in the aspects of high-density optical storage, biological and medical diagnosis, laser color display, underwater detection, underwater communication, remote sensing and the like.

Description

technical field [0001] The invention relates to a blue light source, in particular to a novel single-frequency pulse blue light source based on 978 nm single-frequency pulse fiber laser, which belongs to the field of optical fiber and laser technology. Background technique [0002] The Q-switched laser increases the laser oscillation threshold by inserting a loss device in the laser cavity, and cannot form laser oscillation in a low-Q state. Due to the existence of pump light, the laser medium is in the state of particle population inversion. When the loss device reduces the loss instantaneously, the threshold in the cavity decreases, and it is in a state of high Q value instantaneously. It reaches the oscillation threshold in a short time and forms a laser pulse output. Fiber Q-switched lasers have the distinctive features of low energy consumption, long life, high stability, good beam quality, compact structure, high energy conversion efficiency, and no need for optical pa...

AI Technical Summary

Problems solved by technology

For semiconductor laser diodes (LDs) in the visible band, the development of blue LDs requires expensive equipment and substrate materials. At the same time, the beam quality of LDs is not satisfactory, which is limited in many application fields.

The frequency-doubled solid-state laser pumped by LD requires nonlinear crystal materials for frequency conversion. Although the beam quality is good and the output power is high, the system is more complicated

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