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lasing

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lasing n.鐳射[激光]作用。adj.產生鐳射[激光]的。

n. 鐳射[激光]作用。 adj. 產生鐳射[激光]的。 “cw lasing“ 中文翻譯：   連續波激光產生; 連續波激光振蕩“filament lasing“ 中文翻譯：   絲狀激光發射“lasing ability“ 中文翻譯：   光激射率; 光激射能力“lasing action“ 中文翻譯：   激光作用“lasing area“ 中文翻譯：   激光面“lasing diode“ 中文翻譯：   激光二極管“lasing efficiency“ 中文翻譯：   激光效率“lasing fiber“ 中文翻譯：   激光玻璃纖維; 激光光學纖維; 激光纖維“lasing fluorescence“ 中文翻譯：   激光熒光, 激光發光“lasing gas“ 中文翻譯：   激光氣體“lasing linewidth“ 中文翻譯：   激光線寬“lasing medium“ 中文翻譯：   激光媒質的; 激光作用媒質“lasing mode“ 中文翻譯：   激光模式“lasing region“ 中文翻譯：   激發區“lasing safety“ 中文翻譯：   激光防護“lasing source“ 中文翻譯：   激光輻射源“lasing surface“ 中文翻譯：   激光作用面“lasing threshold“ 中文翻譯：   發雷射底限; 光激射閾; 激光射閾; 激光閾限“lasing time“ 中文翻譯：   激光振蕩時間“parasitic lasing“ 中文翻譯：   寄生激光作用“lasing ion concentration“ 中文翻譯：   激光離子濃度“lasing light emitter“ 中文翻譯：   激光源，激光發射體相干光源“lasing protective filter“ 中文翻譯：   激光防護濾光片“lasing threshold current“ 中文翻譯：   激光抽運閾值電流“lasin“ 中文翻譯：   拉辛; 瓦辛“lasil“ 中文翻譯：   陸海相互作用實驗室

laski

On the basis of the deep study of the current studying situation of multi - wavelength fiber lasers and its tendency of development , we make clear the significance of the study of multi - wavelength fiber lasers and propose a novel multi - wavelength erbium - doped fiber ring laser at room temperature . in this thesis , firstly , with the rate equation theory , we use analytical methods to deduce the relationships of the lasing wavelength and output power vs erbium - doped fiber length , coupler ratio and intracavity losses . the experimental results show a good agreement with the calculated values 本文首先從速率方程理論出發，利用解析的方法推導出摻鉺光纖激光器輸出特性參數與摻鉺光纖和耦合器參數之間的定量關系， (如，激光輸出功率、波長與摻鉺光纖的長度、摻雜濃度、耦合器耦合比及腔的損耗等參數之間的關系) ；并從實驗上加以分析討論，實驗結論與理論值相吻合；利用改變耦合器的耦合比獲得了幾個nm的波長調諧。

Usually , it is thought that the lasing wavelength of a fgesl is locked at the bragg reflection wavelength of fiber grating ( fg ) . owing to a relatively small dependence of the reflection spectrum of fg on ambient temperature ( - 0 . 01nm / c ) , the lasing wavelength of a fgesl is thought to behave more stable than that of a dfb - ld 由于fgesl的激射波長主要由光纖光柵( fg )的布拉格波長確定，因此選擇具有合適布拉格波長的fg就能使fgesl的激射波長處于預置波長處；同時，由于fg的布拉格波長受溫度變化的影響相對較小( 0 . 01nm ) ，因此fgesl與dfb - ld相比具有更高的溫度穩定性。

In this paper , we study inversionless lasing of frequency up - conversion in an open v - type system with incoherent pump . making theoretical analysis and numerical calculation by density - matrix equations of motion , we derive the conditions for the onset of lwi and discuss the effects of the parameters of the system , the detuning of driving field and probe field on the gain , and discuss nonlinear effect in the frequency up - conversion regime . we also give stability and transient analysis 本論文研究了具有非相干泵浦的開放v型系統頻率上轉換無粒子數反轉激光，利用密度矩陣運動方程，通過理論分析和數值計算，得出該系統產生無粒子數反轉激光的條件，討論系統各參數的變化和驅動場與探測場的失諧對激光增益、色散和粒子數差的影響，還討論了頻率上轉換區域的非線性效應，分析了增益的穩定性及系統的瞬態演化過程。

However , the emission wavelength of a dfb - ld needs to be carefully turned on the predetermined wavelength grid by adjusting both laser temperature and bias current . furthermore , dfb - ld has such drawbacks as a relatively large variation of the lasing wavelength with ambient temperature ( ~ 0 . 1nm / c ) which restricts its application in dwdm systems 然而dfb - ld的激射波長受溫度( 0 . 1nm )和偏置電流的影響較大，只有通過調節dfb - ld的溫度和偏置電流，其激射波長才能被調諧在預置的波長處。

For micro - cavity semiconductor laser , station model is proposed in this paper and its steady - state and instantaneous characteristics when the coupling efficiency of spontaneous emission into a lasing mode is equal to 1 are analysised . for current noise , sp noise , noise , p noise , as well as current modulation , sp modulation , modulation and p modulation , using small - signal approximation , we derive the laser ' s corresponding transfer functions . and we calculate their signal - to - noise ratio ( snr ) gain in various parameters through frequency domain analysis in the premiss of large input snr 本文對于微腔半導體激光器，提出站模型，能夠較直觀簡潔地分析微腔半導體激光器的穩態和瞬態特性，利用此模型對具有重要實用價值的= 1的微腔半導體激光器進行了討論；對于電流i噪聲、自發發射壽命_ ( sp )噪聲、自發發射因子噪聲、光子壽命_ p噪聲，以及電流調制、 _ ( sp )調制、調制、 _ p調制，在小信號近似下，得到了相應的激光器的傳遞函數；在大信噪比的前提下，對激光器進行了頻域分析，分別計算了它們在不同參數下的信噪比增益，分析了其抗噪聲性能。

Quantum coherence and interference have led to the observation of many new effects and new techniques in quantum optics and atomic physics . examples include coherent population trapping , electrom agnetically induced transparency , lasing without inversion , and enhancement of the index of refraction without absorption 當應用相干場來驅動光學介質時，可以使得介質的吸收和色散關系發生極大改變，產生許多新的效應，如相干布居捕獲、電磁誘導透明、無反轉激光、無吸收折射率增強等。

On describing a genetic algorithm ( ga ) , we present a method for applying ga to optimize the lasers . a programming is presented for obtaining the maximum laser power . by using the method we optimize the cvl and the co2 laser , including lc circuit parameters of the cvl , the cvl system , the lasing resonator and the gas components mixtured in the co2 laser tube 在這個部分中，首先簡述了遺傳算法，討論了應用遺傳算法來優化激光器的思想和方法，給出了優化大功率激光器的計算機程序設計；然后，對銅蒸汽激光器lc放電電路、大口徑激光器和激光器系統分別進行了優化；對二氧化碳激光器諧振腔和氣壓參量分別進行了優化，介紹了優化二氧化碳激光器諧振腔的實驗以及實驗所獲得的結果

The work mechanism of the novel laser is introduced , and the math expression of efficiency is given , and the lasing mode and the distribution of the optical field are simulated . it proves that for the novel laser , the inner quantum efficiency is larger than l , and at the same injecting current compared with the normal laser ; the output optical power is higher 介紹了新型隧道級聯結構激光器的工作機理，理論推導了新型結構激光器的效率數學表達式，模擬了激光器激射模式及內部光場分布，并用實驗證明了新型結構激光器能夠實現內量子效率大于1 ，且在不高的電流注入條件下獲得了較高的功率輸出。

The analytical solutions of the gain , dispersion and population difference in the steady state of an open ladder lasing without inversion ( lwi ) system are at first given when the phase fluctuation of the driving field is considered . then the effects of the driving field phase fluctuation on the gain , dispersion and population difference are analyzed by the numerical results from the analytical solutions . our research shows that the phase fluctuation of the driving field will results in a finite line width ; with the line width increasing , the gain decreases monotonously , however , variation of the dispersion isn ? t monotonous , it has a maximum value when the line width takes some value ; the line width varying can ? t lead to change lasing from without to with population inversion 給出了有驅動場位相漲落的開放的梯型無粒子數反轉激光( lwi )系統增益、色散和布居數差的定態解析解,進而用得到的數值計算結果分析了驅動場位相漲落對增益、色散和布居數差的影響.研究結果表明,驅動場位相漲落將導致有限線寬;隨著線寬的增加,系統增益單調地減小,但系統色散的變化并不是單調的,當線寬取某個值時,色散有極大值;線寬的變化不能導致無反轉激光向反轉激光的轉變

It is widely accepted that zno is one of the most promising materials for producing an ultraviolet laser at room temperature due to its wide direct band gap ( eg = 3 . 3ev ) and large excitonic binding energy of 60 mev , which was testified by the results of optically pumped stimulated emission and lasing from zno thin films 氧化鋅作為一種寬帶隙半導體（ 3 . 3ev ） ，激子束縛能大（ 60mev ） ，在室溫下容易獲得強的激子發射，而且可能成為紫外激光的重要材料。因此，對氧化鋅的研究已成為繼gan之后寬帶隙半導體研究的又一熱點。

In chapter 3 , we studied the effect of gaussian transverse profile for the driving and laser fields on lasing without population inversion ( lwi ) in a closed v - type system and an open v - type system . moreover , we discussed also the effect of the unsaturated gain coefficient , the cavity - damping rate , the ratio of the atomic injection rates and atomic exit rate on the corresponding systems . in chapter 4 , we mainly discussed the effect of doppler broadening on the gain , dispersion and the frequency up - conversion of the open v - type lwi system and compared the differences and the same between the open system and the corresponding closed system 發現： ( 1 )在考慮doppler展寬的情況下，通過選取合適的實驗室條件(比如合適的原子環境溫度等)可得到合適doppler展寬值，從而使系統獲得最佳增益； ( 2 )要想實現系統的頻率上轉換，同時又要獲得足夠強的無反轉激光增益，則系統頻率轉換比不能選取的太大； ( 3 )對于開放系統，比較小的粒子注入速率比與退出速率對產生無反轉激光是有利碩士學位論文摘要的： （ 4 ）由于dopp1oy展寬的存在，當探測場與驅動場的傳播方向相反時，增益在探測場失諧的某一段區域產生振蕩，且振蕩的振幅、頻率失諧范圍的大小與dopper展寬的取值有關。

Numerical simulations show that : ( 1 ) owing to the temperature variation resulting in the change of the refractive index of both the semiconductor medium and the fi ber , and further inducing the shift of the longitudinal modes of the fgesl , the lasing wavelength of the fgesl has a shift tendency to longer wavelengths with the increase of the temperature ; the mode hopping happens for a short external cavity and disappears for a long external cavity 數值模擬的結果表明:由于溫度變化造成半導體介質和光纖的折射率發生變化從而導致fgesl的縱模發生移動，因此fgesl的激射波長隨著溫度的升高將存在向長波長方向發生移動的趨勢，對于短外腔， fgesl的縱模間距較大，半導體介質折射率隨溫度的變化程度大于光纖折射率隨溫度的變化程度，因而存在模式跳躍現象;對于長外腔，由子fgesl的縱模間隔很小，因而不存在明顯的模式跳躍現象。

( 2 ) under certain temperature , for a short external cavity , a slight change of the external cavity length will result in an obvious variation of the lasing wavelength ; and for a long external cavity ( > 10cm ) , the change of the external cavity length gives almost no effect on the lasing wavelength 當溫度保持一定時，對于短外腔，外腔長度的微小變化可以導致fgesl的激射波長產生顯著的變化;而對于長外腔(尤其當外腔長度大于10cm )時，外腔長度的變化對fgesl的激射波長基本沒有影響。

In this work , based on the threshold condition of the fiber grating external cavity semiconductor laser ( fgesl ) which the phase of the fiber grating has been included , the effect of the temperature variation and the fg external cavity length on the lasing wavelength of the fgesl has been investigated theoretically . in addition , we have used the phase condition of fgesl to get the longitudinal mode distribution of fgesl , then the influence of the injected current on the output characteristics of fgesl has been studied 基于此，本文中利用陽實際的反射相位分布，計及半導體激光器( ld ) 、外腔及光纖光柵( fg )三者的共同作用，根據fgesl滿足的閩值條件，從理論上研究了溫度及外腔長度的變化對fgesl激射波長的影響;根據fgesl中縱模所滿足的相位條件得到其縱模分布后，利用fgesl滿足的多模速率方程，研究了ld的注入電流對fgesl輸出特性的影響。

We study the time evolution law of the atomic response in an open - type inversionless lasing system when the probe or driving field is off - resonance , and compare the law with that obtained when the probe and driving fields are resonant . we find that the detuning has considerable effects on the time evolution law : when the probe or driving fields is off - resonance , the dispersive responses for the probe and driving fields are no longer 0 and the two - photon coherence is no longer a pure real ; the variation of the probe detuning can make the time evolution law of the population distributions and the gain ( absorbtion ) of the driving field changing obviously ; with detuning increasing , the time evolution behavior of the gain ( absorbtion ) , dispersion of the probe field and the two - photon coherence will gradually diviate from the evolution law of the standard damped oscillator ; with the driving detuning increasing , the oscillating time of the dispersion of the driving field becomes longer , the amplitude and the stationary value increase 研究了探測場或驅動場失諧情況下開放的型無粒子數反轉激光系統中原子響應的時間演化規律,并與探測場和驅動場都共振時的演化規律進行了比較.我們發現失諧對時間演化規律有顯著的影響;當驅動場或探測場失諧時,原子對探測場和驅動場色散的響應不再為零,雙光子相干不再是純實量;探測場失諧的變化將使粒子布居和驅動場增益(吸收)的時間演化規律明顯改變;隨著失諧的增大,探測場增益(吸收) 、色散和雙光子相干隨時間的演化行為逐漸偏離標準阻尼振子的演化規律;驅動場色散驅動場失諧量的增加而振蕩時間變長,振幅和穩定值變大

Even so , the instability sometimes accompanied by mode hoping of the lasing wavelength of the fgesl , and the instability of output power have been experimentally observed . the objective of this work is just to explain these experimental phenomena and explore the physical mechanism hidden in these phenomena 盡管fgesl具有這些優點，但是由于其本質上還是屬于外腔激光器，因此仍具有外腔激光器通常存在的激射波長不穩定、跳模及輸出功率不穩定等現象。

The study of lasing without inversion ( lwi ) is one of the most important and the most active research field of lasing physics internationally nowadays . there are not only important theoretic value but also wide applied prospect in the study of lwi 無粒子數反轉激光（ lasingwithoutinversion簡稱lwi ）的研究是當前國際上激光物理最重要、最活躍的研究前沿領域之一， lwi的研究不僅有重要的理論價值而且有廣闊的應用前景。

Since the ultraviolet ( uv ) lasing from zno was realized in 1997 , the study on zno has attracted a great deal of attention because of the intense commercial interest in developing practical short - wavelength semiconductor diode lasers ( sdls ) for the huge market needs 自從日本和香港的科學家在1997年首次實現了室溫光泵浦條件下zno薄膜的紫外受激發射以來， zno材料的研究已經成為國際光電子領域前沿課題中的研究熱點。

The study of lasing without inversion ( lwi ) is an important and active research front field in international lasing physics nowadays . the study of lwi has not only an important theoretical value , but also wide application prospects 無粒子數反轉激光( lasingwithoutinversion簡稱lwi )的研究是當前國際上激光物理重要而活躍的研究前沿領域之一，無粒子數反轉激光的研究不僅具有重要的理論價值，而且具有廣闊的應用前景。