Mid-infrared ultrashort pulse laser source

Abstract

The invention is a mid-infrared ultrashort pulse laser light source. The light source adopts a master-slave laser with a full polarization-maintaining structure, which benefits from the stability of the polarization state of the polarization-maintaining fiber, which can make the master-slave laser have strong anti-interference ability and achieve long-term stability. operation; the master-slave laser adopts master-slave injection all-optical passive synchronization, which eliminates electronic devices and complex feedback control, and can obtain high-precision time synchronization of femtosecond level; the master-slave laser cavity adopts a grating pair to control the The amount of dispersion can perform precise time-frequency domain control on the synchronous light source, and can realize precise adjustment of the output pulse width and spectrum width, thereby optimizing the nonlinear conversion efficiency, improving energy utilization, and obtaining higher power mid-infrared laser output.

Description

technical field [0001] The invention relates to mid-infrared laser technology, in particular to a mid-infrared ultrashort pulse laser source. Background technique [0002] The mid-to-far infrared band not only contains the characteristic spectral lines of many important molecular vibration-rotation energy level transitions, but also covers the transmission window of the earth's atmosphere. Countermeasures and atmospheric communications have important application value and prospects. [0003] In recent years, solid-state lasers have developed rapidly, but the gain medium for directly generating laser radiation in the mid-infrared band is still very limited. Therefore, methods that apply nonlinear optical frequency conversion to mid-infrared generation have emerged, such as optical parametric oscillator (OPO), optical parametric amplification (OPA), and difference frequency generation (DFG). Among them, DFG is an efficient and competitive technology. Its process does not req...

AI Technical Summary

Problems solved by technology

The existing technology obtains the synchronous light source in two ways, one is to obtain a stable synchronous pulse by intensity modulating the continuous light source, but limited by the bandwidth of the modulator, the pulse output by this method is only on the order of nanoseconds, and it is impossible to generate sub- Ultrashort pulses on the order of picoseconds; the other is to synchronize two independent ultrashort pulse lasers through phase-locked loop feedback technology, but it relies on complex control systems and is vulnerable to photodetectors, mixers, filters, etc. device, it is impossible to obtain long-term stable synchronous operation

[0005] In addition, the existing all-optical method based on supercontinuum broadening can avoid the above-mentioned problems and obtain highly stable self-synchronized ultrashort pulse output, but this method faces problems such as low spectral density and poor coherence

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