CAJ | 학술논문

本文所述的光学参量产生器（OPG）是基于高效的三硼酸锂（LBO）晶体，由倍频半导体激光Nd：YVO4振荡放大（ MOPA）系统作为泵浦辐射源．根据Boydand Kleinman理论：聚焦效应可以使泵功率密度为50 GW／cm2，这远远低于LBO晶体的损伤阈值80 GW／cm2，发生简并时其总的转换效率可达到72％．当整体转换效率达到50％时， OPG可调谐范围的范围可以从760 nm到1770 nm．当转换效率低于40％（ M2＜1．3）时，光束质量是非常优良的．通过种子光注入OPG，10 nm（RMS）谱线带宽可以被缩窄．种子激光注入可以表示为波长922．54 nm 的信号．30 nW种子CW 具有足够的功率可以将光谱宽度减少为0．1 nm （RMS）．测量种子光注入OPG脉冲持续时间为9 ps（FWHM）．这会导致时间带宽积为1．30，这是sech2型脉冲理论极限为0．315的4．1倍．
본문소술적광학삼양산생기（OPG）시기우고효적삼붕산리（LBO）정체，유배빈반도체격광Nd：YVO4진탕방대（ MOPA）계통작위빙포복사원．근거Boydand Kleinman이론：취초효응가이사빙공솔밀도위50 GW／cm2，저원원저우LBO정체적손상역치80 GW／cm2，발생간병시기총적전환효솔가체도72％．당정체전환효솔체도50％시， OPG가조해범위적범위가이종760 nm도1770 nm．당전환효솔저우40％（ M2＜1．3）시，광속질량시비상우량적．통과충자광주입OPG，10 nm（RMS）보선대관가이피축착．충자격광주입가이표시위파장922．54 nm 적신호．30 nW충자CW 구유족구적공솔가이장광보관도감소위0．1 nm （RMS）．측량충자광주입OPG맥충지속시간위9 ps（FWHM）．저회도치시간대관적위1．30，저시sech2형맥충이론겁한위0．315적4．1배．
We report a highly efficient optical parametric generator ( OPG) based on lithium triborate ( LBO) .A frequency doubled passively mode -locked diode -pumped Nd:YVO4 oscillator amplifier ( MOPA) system is used as the pump radiation source .Focusing according to the theory of Boyd and Kleinman leads to a pump pow-er density of 50 GW/cm2 , which is well below the damage threshold of LBO of 80 GW/cm2 .The overall conver-sion efficiency reaches a value of 72%measured at degeneracy .The tuning range of the OPG ranges from 760 nm (signal) to 1770 nm (idler) when referring to an overall conversion efficiency of 50%.The beam quality is excellent for conversion efficiencies below 40%(M2 <1.3).The typically 10 nm (RMS) broad spectrum can be narrowed by injection seeding the OPG .Injection seeding is demonstrated for a signal wavelength of 922.54 nm.A seed cw power of 30 nW is sufficient to reduce the spectral width to 0.1 nm ( RMS) .The measured in-jection-seeded OPG pulse duration is 9 ps ( FWHM).This results in a time -bandwidth product of 1.30, which is 4.1 times the theoretical limit of 0.315 for sech2-shaped pulses .