功率均衡度可調(diào)諧的雙頻微腔激光器研究
發(fā)布時(shí)間：2018-10-21 20:14
【摘要】：相干波源在無(wú)線通信、材料光譜分析、頻率計(jì)量和混合光載波雷達(dá)等領(lǐng)域展現(xiàn)了不可忽視的應(yīng)用潛力。將射頻頻差的雙頻激光器的輸出信號(hào)通過(guò)單行載流子光電二極管等外差拍頻是產(chǎn)生高純度射頻信號(hào)的有效手段。用于外差拍頻的雙頻激光信號(hào)的兩個(gè)頻率成分的功率均衡程度直接影響拍頻效率。本文提出了一種基于熱致雙頻激光波長(zhǎng)和增益介質(zhì)發(fā)射譜漂移的功率均衡度可調(diào)諧的雙頻微腔激光器。首先基于四能級(jí)速率方程理論,建立洛倫茨線型的耦合速率方程模型對(duì)雙頻激光信號(hào)運(yùn)行機(jī)制進(jìn)行分析,從理論上揭示造成均勻加寬雙頻激光器輸出功率非均衡的主要原因是雙頻波長(zhǎng)在增益介質(zhì)發(fā)射譜內(nèi)對(duì)應(yīng)的發(fā)射截面不同(即非均衡增益)。更重要的是,溫度對(duì)雙頻功率均衡度的影響是雙頻激光波長(zhǎng)和增益介質(zhì)發(fā)射截面譜的溫度依賴性共同作用的結(jié)果。采用摻雜濃度和外形尺寸均相同的未鍍膜的薄片Nd:YVO4晶體和雙端鍍膜的薄片Nd:YVO4晶體(微腔),分別對(duì)不同溫控條件下未鍍膜薄片Nd:YVO4晶體的發(fā)射截面譜和雙頻Nd:YVO4微腔激光器的輸出激光光譜進(jìn)行研究,從實(shí)驗(yàn)上揭示增益介質(zhì)發(fā)射截面譜和雙頻激光波長(zhǎng)隨溫度變化的一般規(guī)律。實(shí)驗(yàn)結(jié)果表明:在所研究的溫控范圍內(nèi),隨著熱沉溫度的增加,雙頻Nd:YVO4微腔激光器的輸出激光光譜紅移,輸出功率下降,并伴隨有“跳模”現(xiàn)象發(fā)生;未鍍膜薄片Nd:YVO4晶體的發(fā)射截面譜紅移,峰值發(fā)射截面減小,譜線展寬。雙頻Nd:YVO4微腔激光器的輸出激光光譜包絡(luò)中心波長(zhǎng),以及未鍍膜薄片Nd:YVO4晶體的發(fā)射截面譜峰值波長(zhǎng)的紅移速率分別為3.88 pm/°C和3.84 pm/°C。為了分析雙頻激光信號(hào)的相對(duì)強(qiáng)度比變化的原理,對(duì)雙頻激光波長(zhǎng)、增益介質(zhì)發(fā)射截面譜,以及它們對(duì)輸出功率均衡度的相互作用之間的關(guān)系進(jìn)行綜合討論。通過(guò)對(duì)比上述兩條擬合溫度特性曲線,發(fā)現(xiàn)當(dāng)激光光譜包絡(luò)中心波長(zhǎng)和發(fā)射截面譜峰值波長(zhǎng)重合時(shí),雙頻Nd:YVO4微腔激光器工作溫度和未鍍膜薄片Nd:YVO4晶體發(fā)光區(qū)域溫度之間存在一個(gè)由抽運(yùn)功率和激光功率的差別引起的溫度差。對(duì)于本文實(shí)驗(yàn)中所涉及到的雙頻Nd:YVO4微腔激光器,這一溫度差近似等于激光增益介質(zhì)發(fā)光區(qū)域和熱沉的溫差,約為54°C。雙頻激光平均波長(zhǎng)與經(jīng)溫度補(bǔ)償?shù)奈村兡け∑琋d:YVO4晶體的發(fā)射譜峰值波長(zhǎng)的相對(duì)位置決定了雙頻激光信號(hào)的相對(duì)功率比。通過(guò)精確控制熱沉溫度,對(duì)雙頻激光波長(zhǎng)和增益介質(zhì)發(fā)射截面譜的匹配程度進(jìn)行調(diào)節(jié),實(shí)現(xiàn)雙頻激光輸出功率均衡�？刂茻岢翜囟仍�-5.6°C,實(shí)驗(yàn)獲得功率均衡度約為0.991,輸出功率約為264 mW,頻差約為67 GHz的雙頻激光信號(hào)輸出。在一系列能夠達(dá)到功率均衡的特定溫度點(diǎn)中,較低的熱沉溫度可以實(shí)現(xiàn)更高功率的功率均衡雙頻信號(hào)輸出。
[Abstract]:Coherent wave sources have shown great potential in wireless communication, material spectrum analysis, frequency measurement and hybrid optical carrier radar. It is an effective method to produce high purity RF signal by passing the output signal of dual-frequency laser with frequency difference through the heterodyne beat frequency such as single-line carrier photodiode. The power equalization of the two frequency components of the dual frequency laser signal for heterodyne beat frequency directly affects the beat efficiency. In this paper, a dual-frequency micro-cavity laser with tunable power balance based on the wavelength and gain emission spectrum drift of a thermally induced dual-frequency laser is proposed. Firstly, based on the four-level rate equation theory, a Lorentz linear coupling rate equation model is established to analyze the operating mechanism of dual-frequency laser signal. It is theoretically revealed that the main reason for the unbalanced output power of the uniformly widened dual-frequency laser is that the emission cross-sections of the dual-frequency wavelength in the gain medium emission spectrum are different (that is, the unbalanced gain). More importantly, the effect of temperature on dual-frequency power equalization is the result of the temperature dependence of the wavelength of dual-frequency laser and the spectrum of gain medium emission cross section. The emission cross-sections and dual-frequency Nd:YVO4 micro-cavity excitations of uncoated Nd:YVO4 crystals and double-ended Nd:YVO4 crystals (microcavities) with the same doping concentration and shape were investigated under different temperature control conditions, respectively. The output laser spectrum of the optical device is studied. The general rules of the gain medium emission cross section spectrum and the wavelength of dual-frequency laser with temperature are revealed experimentally. The experimental results show that with the increase of heat sink temperature, the output spectrum of dual-frequency Nd:YVO4 micro-cavity laser is red-shifted, the output power is decreased, and the phenomenon of "mode hopping" occurs. The emission cross section of uncoated Nd:YVO4 crystal is red-shifted, the peak emission cross section is decreased, and the spectrum line is widened. The red shift rates of the central wavelength of the output laser spectrum and the peak wavelength of the emission cross section of the uncoated Nd:YVO4 crystal are 3.88 pm/ 擄C and 3.84 pm/ 擄C, respectively. In order to analyze the principle of the variation of the relative intensity ratio of the dual-frequency laser signal, the relationship between the wavelength of the dual-frequency laser, the gain medium emission cross-section spectrum and the interaction between them to the output power equalization is discussed synthetically. By comparing the above two fitting temperature characteristic curves, it is found that when the central wavelength of the laser spectrum envelope and the peak wavelength of the emission cross section spectrum coincide, There is a temperature difference between the operating temperature of dual-frequency Nd:YVO4 microcavity laser and the luminescent region temperature of uncoated thin Nd:YVO4 crystal due to the difference between pump power and laser power. For the dual-frequency Nd:YVO4 microcavity laser in this paper, the temperature difference is approximately equal to the temperature difference between the laser gain medium luminescence region and the heat sink, which is about 54 擄C. The relative position of the average wavelength of dual-frequency laser and the peak wavelength of emission spectrum of uncoated thin Nd:YVO4 crystal determined the relative power ratio of dual-frequency laser signal. By controlling the heat sink temperature accurately, the matching degree between the wavelength of dual-frequency laser and the spectrum of gain medium emission cross section is adjusted to realize the output power equalization of dual-frequency laser. When the heat sink temperature is -5.6 擄C, the power equalization is about 0.991.The output power is about 264 mW, and the frequency difference is about 67 GHz. In a series of specific temperature points which can achieve power equalization, the lower heat sink temperature can achieve higher power equalization dual-frequency signal output.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN248
本文編號(hào)：2286241
[Abstract]:Coherent wave sources have shown great potential in wireless communication, material spectrum analysis, frequency measurement and hybrid optical carrier radar. It is an effective method to produce high purity RF signal by passing the output signal of dual-frequency laser with frequency difference through the heterodyne beat frequency such as single-line carrier photodiode. The power equalization of the two frequency components of the dual frequency laser signal for heterodyne beat frequency directly affects the beat efficiency. In this paper, a dual-frequency micro-cavity laser with tunable power balance based on the wavelength and gain emission spectrum drift of a thermally induced dual-frequency laser is proposed. Firstly, based on the four-level rate equation theory, a Lorentz linear coupling rate equation model is established to analyze the operating mechanism of dual-frequency laser signal. It is theoretically revealed that the main reason for the unbalanced output power of the uniformly widened dual-frequency laser is that the emission cross-sections of the dual-frequency wavelength in the gain medium emission spectrum are different (that is, the unbalanced gain). More importantly, the effect of temperature on dual-frequency power equalization is the result of the temperature dependence of the wavelength of dual-frequency laser and the spectrum of gain medium emission cross section. The emission cross-sections and dual-frequency Nd:YVO4 micro-cavity excitations of uncoated Nd:YVO4 crystals and double-ended Nd:YVO4 crystals (microcavities) with the same doping concentration and shape were investigated under different temperature control conditions, respectively. The output laser spectrum of the optical device is studied. The general rules of the gain medium emission cross section spectrum and the wavelength of dual-frequency laser with temperature are revealed experimentally. The experimental results show that with the increase of heat sink temperature, the output spectrum of dual-frequency Nd:YVO4 micro-cavity laser is red-shifted, the output power is decreased, and the phenomenon of "mode hopping" occurs. The emission cross section of uncoated Nd:YVO4 crystal is red-shifted, the peak emission cross section is decreased, and the spectrum line is widened. The red shift rates of the central wavelength of the output laser spectrum and the peak wavelength of the emission cross section of the uncoated Nd:YVO4 crystal are 3.88 pm/ 擄C and 3.84 pm/ 擄C, respectively. In order to analyze the principle of the variation of the relative intensity ratio of the dual-frequency laser signal, the relationship between the wavelength of the dual-frequency laser, the gain medium emission cross-section spectrum and the interaction between them to the output power equalization is discussed synthetically. By comparing the above two fitting temperature characteristic curves, it is found that when the central wavelength of the laser spectrum envelope and the peak wavelength of the emission cross section spectrum coincide, There is a temperature difference between the operating temperature of dual-frequency Nd:YVO4 microcavity laser and the luminescent region temperature of uncoated thin Nd:YVO4 crystal due to the difference between pump power and laser power. For the dual-frequency Nd:YVO4 microcavity laser in this paper, the temperature difference is approximately equal to the temperature difference between the laser gain medium luminescence region and the heat sink, which is about 54 擄C. The relative position of the average wavelength of dual-frequency laser and the peak wavelength of emission spectrum of uncoated thin Nd:YVO4 crystal determined the relative power ratio of dual-frequency laser signal. By controlling the heat sink temperature accurately, the matching degree between the wavelength of dual-frequency laser and the spectrum of gain medium emission cross section is adjusted to realize the output power equalization of dual-frequency laser. When the heat sink temperature is -5.6 擄C, the power equalization is about 0.991.The output power is about 264 mW, and the frequency difference is about 67 GHz. In a series of specific temperature points which can achieve power equalization, the lower heat sink temperature can achieve higher power equalization dual-frequency signal output.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN248
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