高效率雙Nd:YVO4 雷射和頻黃光產生系統;CW, intracavity orange light generation in an all-solid-state laser system using two Nd:YVO4 laser crystals 研

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题名:	高效率雙Nd:YVO4 雷射和頻黃光產生系統;CW, intracavity orange light generation in an all-solid-state laser system using two Nd:YVO4 laser crystals 研
作者:	陳彥良;Yeh-Liang Chen
贡献者:	光電科學研究所
关键词:	橘黃光;orange;Nd:YVO4
日期:	2009-07-10
上传时间:	2009-09-22 10:36:38 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	高功率微小化窄頻寬的黃-橘光雷射在生醫、顯示科技、天文觀測、光譜術等有重要的應用。我們首先設計與架設一簡易連續波輸出之窄頻寬593.5-nm 黃橘光雷射系統於一半導體雷射泵浦、以兩個體積布拉格反射器為共振腔鏡之雙波長振盪(1064 nm and 1342 nm)Nd:YVO4 雷射內，並以非線性晶體BIBO 為腔內和頻產生 593.5-nm 黃橘光雷射。在半導體泵浦功率為3.6W 時，有超過10mW 的黃橘光單縱模雷射輸出，其單縱膜頻寬約15MHz。在半導體泵浦功率為4.2W時，有將近20mW 窄頻寬(<10 pm)之黃橘光雷射輸出，而這樣的頻寬仍十倍小於一般使用介電鍍膜鏡之雙波長振盪Nd3+雷射的頻寬。我們接著設計與架設一連續波高功率黃橘光雷射輸出系統。該系統使用一半導體雷射分光泵浦雙Nd:YVO4 雷射晶體所形成之雙波長振盪(1064 nm and 1342 nm)雷射並以非線性晶體BIBO 為腔內和頻介質產生593.5-nm 黃橘光雷射。使用此共振腔方式有著減少增益競爭與允許最佳化雙雷射功率輸出的優點以達到高整體轉換效率。從如此簡易雷射系統，吸收泵浦功率為16W 情況下，我們得到超過 63mW 黃橘光雷射輸出，其對應的光學轉換效率為0.375%。Yellow-orange laser sources are in particular demand in applications in bio-medicine, Lidar, astronomy, and military. Single-frequency operation of these laser sources is of further interest in spectroscopy and remote-sensing applications. In this thesis, a simple scheme is first proposed to generate narrow spectral-width yellow-orange laser output. We report on the demonstration of a narrow-line, CW orange 593.5-nm laser achieved via intracavity sum-frequency generation (SFG) of a diode-pumped dual-wavelength (1064 and 1342 nm) Nd:YVO4 laser using two volume Bragg grating (VBG) reflectors. The intracavity SFG process was performed in a type-I BIBO crystal. More than 10-mW orange 593.5-nm generation radiating at single longitudinal mode of ~15 MHz spectral linewidth can be obtained from this compact laser system at diode pump power of 3.6 W. At a higher pump power of 4.2 W, the SFG output reached a power of ~20 mW and radiated at two longitudinal modes (corresponding to a spectral linewidth of <10 pm), which is still >10 times narrower than that observed from SFG of a conventional dual-wavelength Nd3+ laser system. We have next designed and constructed a compact continuous-wave orange light system by performing sum-frequency mixing in a diode-pumped laser system using two Nd:YVO4 laser crystals respectively for oscillating at the 1064 and 1342 nm and an intracavity BIBO SFG crystal. Such an intracavity SFG source based on two Nd3+ laser crystals has the advantages of eliminating the gain competition between the two pump wavelengths and allowing for separately optimizing two laser powers for achieving high overall efficiency. More than 63-mW 593.5-nm generation can be obtained from this compact laser system at an absorbed pump power of ~16 W, which corresponds to an optical conversion efficiency of 0.375%.
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