Recent progress of high power green laser based on frequency doubling technology for fiber laser
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摘要:
详细调研了近年来基于光纤激光倍频的高功率绿光光源的研究进展，绿光激光功率从百瓦到千瓦，光束质量近衍射极限，而且输出功率有望进一步提升。采用光纤激光倍频技术得到高功率绿光光源的技术路线大致分为两条：一条是用高功率单子束光纤激光器作为基频光源，然后级联单程非临界相位匹配LBO晶体作为倍频；另一条是用多子束光纤激光器作为基频光源，然后合成与倍频分别实现，或者合成与倍频一体实现。对比两条技术路线，前者相对后者简单，后者具有更高输出功率的潜力，但是倍频晶体的弱吸收是两条技术路线共同面临的问题。
Abstract:The green laser can be used for the processing of highly reflective metals such as copper. Compared with the 1 μm laser which is broadly used now, green laser has the absorption efficiency nearly an order of magnitude higher, which can better meet the needs of various fields for the precision processing of highly reflective metals. Thus, the application prospect of high power green laser is very broad. In this paper, recent progress of high power green laser based on frequency doubling technology for fiber laser is investigated in detail. The power of green laser has increased from 100 W to 1 kW, the beam quality is close to the diffraction limit, and the output power is expected to be further improved. There are two technical routes to obtain high power green laser by using fiber laser frequency doubling technology. One is to use high power single beam fiber laser as the fundamental frequency light source and cascade single-pass frequency doubling technology. The other is to use multiple-beam fiber lasers as the fundamental frequency light source, realize beam combining and frequency doubling respectively, or beam combining and frequency doubling at the same time. The former route is simpler than the latter, but the latter has the potential of higher output power. The weak absorption of frequency doubling crystal is the common problem faced by the two technical routes.
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Key words:
- laser optics /
- high power fiber laser /
- frequency doubling technology /
- green laser /
- phase matching
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图 1 美国IPG公司基于线偏振窄线宽光纤激光器的绿光光源光路图
Figure 1. The schematic of experimental green laser based on narrow linewidth fiber laser of IPG photonics
图 2 美国相干公司基于非保偏光纤激光器结合主动偏振控制技术的绿光光源光路图
Figure 2. The schematic of green laser based on non-polarization-maintaining narrow linewidth fiber laser with polarization controller of Coherent
图 3 上海光机所基于窄线宽保偏激光器的绿光光源光路图
Figure 3. Schematic of green laser based on narrow linewidth fiber laser of Shanghai Institute of Optics and Fine Mechanics
图 4 大阪大学基于高功率纳秒级脉冲光纤激光器获得绿光和紫外光的系统光路图
Figure 4. Schematic for obtaining green laser and ultraviolet laser based on high power nanosecond pulsed fiber laser of Osaka University
图 5 立陶宛EKSPLA公司在欧洲专利中提出的倍频合束方案
Figure 5. Frequency doubling beam combining scheme proposed by EKSPLA of Lithuania in European Patent
图 6 立陶宛物理科学与技术中心基于倍频合束非相干方案的四路合束实验光路图
Figure 6. Schematic of four fiber lasers beam combining based on incoherent scheme by Center for Physical Sciences and Technology of Lithuania
图 7 立陶宛物理科学与技术中心基于倍频合束相干方案的四路合束实验装置图
Figure 7. Schematic of four fiber lasers beam combining based on coherent scheme by Center for Physical Sciences and Technology of Lithuania
图 8 晶体厚度40 mm/60 mm时输出绿光功率与基频光功率关系曲线
Figure 8. Relation curves of output green light power and fundamental light power when the thickness of crystal is 40 mm and 60 mm
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