600-W single-mode single-frequency thulium fiber laser amplifier

Gregory D. Goodno; Lewis D. Book; Joshua E. Rothenberg

doi:10.1117/12.809765

19 February 2009 600-W single-mode single-frequency thulium fiber laser amplifier

Gregory D. Goodno, Lewis D. Book, Joshua E. Rothenberg

Proceedings Volume 7195, Fiber Lasers VI: Technology, Systems, and Applications; 71950Y (2009) https://doi.org/10.1117/12.809765
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

A four-stage, Tm-doped fiber amplifier chain emitted 608 W of single-frequency (SF) output power with 53 dB gain, 54% slope efficiency, and M² = 1.05 beam quality. The output power was limited by available pump power. The final amplifier stage preserved the input <5-MHz linewidth and imposed negligible phase noise above 3 kHz. SBS limits at the 2040-nm operating wavelength were measured by splicing different lengths of passive fiber to the amplifier exit. Thermal limits of the fiber were explored analytically and are consistent with the measured power performance. Comparison of the SBS and thermal limits suggests a maximum SF power of ~750 W from this fiber configuration, with further potential to scale past 1 kW with different fiber parameters. To our knowledge, this is the highest power reported to date from any single-frequency, single-mode fiber laser.

Citation Download Citation

Gregory D. Goodno, Lewis D. Book, and Joshua E. Rothenberg "600-W single-mode single-frequency thulium fiber laser amplifier", Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 71950Y (19 February 2009); https://doi.org/10.1117/12.809765

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