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研究了LD泵浦1319nm单块非平面环形腔(NPRO)激光器的强度噪声特性,发现随着输出功率的增加,弛豫振荡峰频率从100kHz向280kHz移动,同时弛豫振荡峰宽度增加但幅度降低,且在弛豫振荡峰处发生π相位跃变,在600kHz以上频率区域,噪声已经接近量子噪声极限。自行设计的噪声抑制电路在实现足够大增益的同时,在500kHz附近获得了约65°的相位超前,由此获得了优于通常同类实验的噪声抑制结果:当弛豫振荡峰频率为230kHz时,弛豫振荡峰处和低频区域的强度噪声幅度分别被抑制了45dB和20dB。
The intensity and noise characteristics of an LD pumped 1319nm monolithic non-planar ring cavity (NPRO) laser were investigated. It was found that as the output power increases, the relaxation oscillation frequency shifts from 100kHz to 280kHz, while the width of the relaxation oscillation peak increases but decreases , And π-phase jump occurs at the relaxation oscillation peak. In the frequency region above 600kHz, the noise is close to the quantum noise limit. The self-designed noise suppression circuit achieves a phase gain of about 65 ° near 500 kHz while achieving a large enough gain, thereby obtaining a better noise rejection result than that of the usual experiments: when the relaxation oscillation peak frequency is 230 kHz, The amplitudes of the intensity noise at the relaxation oscillation peak and the low frequency region are suppressed by 45 dB and 20 dB, respectively.