Jensen Ole Bjarlin, Petersen Paul Michael
DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark.
Opt Express. 2013 Mar 11;21(5):6076-81. doi: 10.1364/OE.21.006076.
We report the realization of a tapered diode laser operated in a coupled ring cavity that significantly improves the coherence properties of the tapered laser and efficiently generates tunable light at the second harmonic frequency. The tapered diode laser is tunable with single-frequency output in the broad wavelength range from 1049 nm to 1093 nm and the beam propagation factor is improved from M(2) = 2.8 to below 1.1. The laser frequency is automatically locked to the cavity resonance frequency using optical feedback. Furthermore, we show that this adaptive external cavity approach leads to efficient frequency doubling. More than 500 mW green output power is obtained by placing a periodically poled LiNbO(3) crystal in the external cavity. The single frequency green output from the laser system is tunable in the 530 nm to 533 nm range limited by the LiNbO(3) crystal. The optical to optical conversion efficiency exceeds 30%.
我们报道了一种在耦合环形腔中运行的锥形二极管激光器，它显著改善了锥形激光器的相干特性，并能有效地产生二次谐波频率的可调谐光。该锥形二极管激光器在1049纳米至1093纳米的宽波长范围内具有单频输出可调谐性，光束传播因子从M(2)=2.8提高到低于1.1。利用光反馈将激光频率自动锁定到腔共振频率。此外，我们表明这种自适应外腔方法能实现高效的倍频。通过在外部腔中放置周期性极化的LiNbO(3)晶体，可获得超过500毫瓦的绿色输出功率。激光系统的单频绿色输出在530纳米至533纳米范围内可调，这一范围受LiNbO(3)晶体限制。光到光转换效率超过30%。
