Cascadable 729nm single-mode laser amplifier

Abstract

The invention relates to a cascadable 729nm single-mode laser amplifier, which includes a laser seed source, a mode selection optical path, an amplifying optical path, a tapered amplifier protection circuit and a tapered amplifier. The laser seed source is used to output the seed laser, and the seed laser is selected through the mode selection optical path, and then multi-stage amplified through several cascaded amplification optical paths, and then input into the tapered amplifier through the output stage amplification optical path to realize For the amplification of the seed laser, the tapered amplifier protection circuit controls the power input of the tapered amplifier by monitoring the state of the laser input to the tapered amplifier. The invention adopts cascading technology to realize high-magnification amplification of ultra-low-noise 729nm single-mode laser, improve the stability and reliability of laser amplification, and the tapered amplifier protection circuit can prevent the tapered amplifier from being damaged when there is no laser input.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a cascade-connectable 729nm single-mode laser amplifier. Background technique [0002] The key to quantum computing is how to build a real quantum calculator. The architecture of quantum calculator mainly includes photon polarization, cavity quantum electrodynamics (CQED), ion trap and nuclear magnetic resonance (NMR). nuclear magnetic resonance, NMR), the ion trap architecture is the most successful one that can satisfy fault-tolerant quantum computing. [0003] 40 Ca + Ionic|4S 1 / 2 ,m J =-1 / 2> The excited state has a lifetime as long as (1.167±0.007) s and a magnetic field sensitivity as low as 5.6MHz / mT, making it the main working substance for quantum computing in the ion trap architecture. in order to 40 Ca + From Ground State | 3D 5 / 2 ,m J =-1 / 2> Excited to |4S 1 / 2 ,m J =-1 / 2> excited state, it is necessary to use a 729nm laser with a phase noise of only ...

AI Technical Summary

Problems solved by technology

The main problem of this method is that the transmitted light of the superstable cavity as the seed laser is only tens of μW (microwatts), and the magnification is very high (hundreds to thousands). At this time, due to the low power of the seed laser compared with LD spontaneous emission , so the seed laser has a low probability of success when competing with LD spontaneous emission. On the one hand, it is difficult to achieve stimulated amplification, and on the other hand, it is easy to mode-hop after stimulated amplification.

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