【摘要】：高功率二極管泵浦的堿金屬蒸氣激光器DPALs (Diode Pumped Alkali Vapor Lasers)是近幾年來人們所廣泛關注的新型激光器件。DPALs將固體激光器和氣體激光器的優(yōu)點融入一體,在得到高效、高功率的近紅外激光輸出方面有著較為突出的優(yōu)勢。同時DPALs具有量子效率高,光束質(zhì)量好,和線寬窄(可達MHz)等優(yōu)點,可以廣泛的應用到軍事領域、定向能力傳輸、以及激光加工領域。最近幾年,各國科學家對DPALs進行了相關研究并得到了較大進展。目前,較多的研究在于對泵浦源和抽運方式的改進,通過調(diào)節(jié)緩沖氣體壓強比以及提高諧振腔和泵浦光之間的模式匹配系數(shù),來獲得高效、高功率的激光輸出。然而,關于橫向泵浦模型下的堿金屬蒸氣激光MOPA系統(tǒng)的動力學機制和相關實驗方面的文獻較少,因此,深入研究該類激光MOPA系統(tǒng)的激光放大動力學過程和輸出特性具有重要意義。本文首先對二極管泵浦堿金屬蒸氣激光的發(fā)展背景及研究進展做了介紹。分別從縱向和橫向兩個方面闡釋了DPALs的工作原理、相關技術路線、不同抽運方式下的動力學模型、實驗設計以及DPALs的特點和應用。在此基礎上考慮了飽和放大效應,綜合分析了激光的放大機制和動力學過程,重新定義了種子光和泵浦光之間的模式匹配系數(shù),分別建立起二極管橫向單側(cè)和雙側(cè)泵浦的高功率堿金屬蒸氣激光MOPA (Maser Oscillator and Power Amplifier)系統(tǒng)的動力學模型。模擬計算了系統(tǒng)中泵浦光功率、諧振腔長度、介質(zhì)池內(nèi)溫度等對激光輸出特性的影響。同時模擬了泵浦光功率在蒸氣池中的分布,通過模擬最終得出泵浦光的強度在泵浦方向上呈現(xiàn)出非線性吸收的結(jié)果。通過計算得到了一組優(yōu)化參數(shù),對該類激光MOPA系統(tǒng)的優(yōu)化設計提供了一定的參考。
[Abstract]:High power diode pumped alkali metal vapor laser (DPALs (Diode Pumped Alkali Vapor Lasers) is a new type of laser device. DPALs integrate the advantages of solid state laser and gas laser. High power near-infrared laser output has more outstanding advantages. At the same time, DPALs has the advantages of high quantum efficiency, good beam quality and narrow line width (up to MHz). It can be widely used in military field, directional capability transmission, and laser processing. In recent years, scientists from all over the world have made great progress in the research of DPALs. At present, much research is done on the improvement of pump source and pump mode. By adjusting the pressure ratio of buffer gas and increasing the mode matching coefficient between resonator and pump light, the high efficiency and high power laser output can be obtained. However, there are few literatures on the kinetic mechanism and related experiments of alkali metal vapor laser MOPA system under transversely pumped model. It is of great significance to study the laser amplification dynamics and output characteristics of this kind of laser MOPA system. In this paper, the development background and research progress of diode pumped alkali metal vapor laser are introduced. The working principle of DPALs, related technical route, dynamics model under different pumping modes, experimental design, characteristics and application of DPALs are explained from longitudinal and horizontal aspects respectively. On this basis, the saturation amplification effect is considered, the amplification mechanism and dynamic process of the laser are comprehensively analyzed, and the mode matching coefficient between the seed light and the pump light is redefined. A dynamic model of a high power alkali metal vapor laser (MOPA (Maser Oscillator and Power Amplifier) system pumped by diodes on one side and two sides was established respectively. The effects of pump power, cavity length and temperature in the dielectric cell on the laser output characteristics are simulated and calculated. At the same time, the distribution of the pump power in the vapor pool is simulated, and the nonlinear absorption of the pump intensity in the pump direction is obtained through the simulation. A set of optimization parameters are obtained by calculation, which provides a certain reference for the optimization design of this kind of laser MOPA system.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248

【參考文獻】

相關碩士學位論文 前1條

1 陶天炯;激光穩(wěn)頻鎖相研究[D];浙江大學;2010年

，

本文編號：2219761