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1560nm CW Frequency Doubling and Frequency Locking via Rubidium Absorption Spectroscopy

Author: YangJianFeng
Tutor: WangJunMin
School: Shanxi University
Course: Optics
Keywords: Periodically poled lithium niobate Periodically poled potassium titanyl phosphate crystals Frequency multiplication Laser pulses
CLC: TN241
Type: Master's thesis
Year: 2010
Downloads: 71
Quote: 1
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Abstract


D2 line of 780 nm laser corresponding alkali metal rubidium atoms , have a wide range of applications in the field of cold atomic physics , quantum optics , cutting-edge science . The 780 nm band semiconductor laser has been commercialized , but can not be obtained directly using semiconductor laser frequency stability , pulse repetition rate and pulse width can be adjusted , and high peak power , short pulse laser of 780 nm . We can use the seed light injection approach , the 1560 nm laser light source of the optical communication band , business with high speed integrated waveguide-type amplitude modulator cut short pulse of the square wave and then injected into the erbium doped fiber amplifier (EDFA) in an enlarged , generated through the multiplier 780nm controllable pulse laser. Using 1560 nm distributed feedback semiconductor laser (DFB) injected into the erbium-doped fiber amplifier 1560 nm single-frequency laser as a seed source , single octave through the QPM periodically poled crystal , a stable 780 nm laser . The main work is as follows : ( 1) a brief introduction to the theoretical analysis of the experimental research background of the whole system and the multiplier process . Discussion of the important factors that affect second harmonic power - phase matching , highlight this experiment , the quasi-phase- matching technique . ( 2) to study the characteristics of the PPLN crystal multiplier . PPLN crystal using a multi - cycle experiment 780nm light the multiplier , when 1.37W of 1560nm baseband light injection 25.2mW 780nm harmonic can be obtained , corresponding to the frequency doubling efficiency ~ 1.84% , non - linear conversion efficiency of ~ 1.37% / W. (3) PPKTP crystal multiplier characteristics . Experiments using single-cycle PPKTP crystal harmonic of 780nm . 15mW 780nm harmonic 1.37W baseband optical injection , corresponding to 1.16% SHG efficiency , non - linear conversion efficiency ~~ 0.84 % / W . (4 ) 1560 nm DFB laser by EDFA amplification and after PPLN crystal multiplier locked to the absorption line of rubidium atoms , laser 30s within the free-running frequency drift 52MHz, 30s remaining drift of ± 3.5MHz locked .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser physics and basic theory
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