藉由長共振腔極大反常色散摻鉺光纖鎖模雷射來產生高能量脈衝

Abstract

在本論文中，我們研究一套操作在超大異常色散之摻鉺光纖被動鎖模雷射系統的輸出特性。雷射共振腔長約400公尺，可產生500kHz 超低脈衝重複頻率，利用不同的輸出耦合率，可直接輸出超過120nJ高能量穩定脈衝序列。藉由適當調整輸入之功率與偏振控制器之角度可得到穩定不分裂之方波輸出,最後透過脈衝寬度與頻寬計算可得出此雷射輸出之特性參數來估計脈寬壓縮的資訊。

In this thesis, we experimentally demonstrate a passive mode-locked Erbium-doped fiber laser with large net round trip anomalous dispersion and nonlinearity through about 400m cavity length. The laser can output optical pulse trains at the low repetition rate around 500kHz and with the high pulse energy larger than 120nJ directly from the laser output. By adjusting the polarization controllers (PCs) and the pump power level, high energy pulses with square profile and nanosecond pulse-width without pulse breaking can be observed. Finally, we study the characteristic parameters of our pulses for further compressing the pulse-width to attain the short pulse-width and high peak power.