Pulsed blue laser source based on frequency quadrupling of a thulium fiber laser

Honea, Eric C.; Savage-Leuchs, Matthias; Bowers, Mark S.; Yılmaz, Tolga; Mead, Roy D.

doi:10.1117/12.2005436

Cited by 11 publications

(1 citation statement)

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“…Fourth-harmonic generation of those wavelengths yields potential visible output from 475 to 525nm, spanning blue to green output. To date, 1.2W of blue light at 485nm has been demonstrated at 10kHz PRF in a 2-stage SHG approach, using Tm-doped fiber as a pump source [4]. Using a similar approach, we show blue output using a monolithic thulium fiber front-end to generate and amplify pulses which are subsequently converted to the blue.…”

Section: Introductionmentioning

confidence: 96%

486nm blue laser operating at 500 kHz pulse repetition frequency

et al. 2016

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Compact, high power blue light in the 470-490nm region is difficult to generate due to the lack of laser sources which are easily convertible (through parametric processes) to those wavelengths. By using a pulsed Tm-doped fiber laser as a pump source for a 2-stage second harmonic generation (SHG) scheme, we have generated ~2W of 486.5nm light at 500kHz pulse repetition frequency (PRF). To our knowledge, this is the highest PRF and output power achieved in the blue region based on a frequency converted, monolithic fiber laser. This pump laser is a pulsed Tm-doped fiber laser/amplifier which generates 12.8W of 1946nm power at 500kHz PRF with diffraction-limited output from a purely single-mode fiber. The output from this laser is converted to 973nm through second harmonic generation (SHG). The 973nm is then converted to 486.5nm via another SHG stage. This architecture operates with very low peak power, which can be challenging from a nonlinear conversion standpoint. However, the low peak power enables the use of a single-mode monolithic fiber amplifier without undergoing nonlinear effects in the fiber. This also eliminates the need for novel fiber designs, large-mode area fiber, or free-space coupling to rod-type amplifiers, improving reliability and robustness of the laser source. Higher power and conversion efficiency are possible through the addition of Tm-doped fiber amplification stages as well as optimization of the nonlinear conversion process and nonlinear materials. In this paper, we discuss the laser layout, results, and challenges with generating blue light using a low peak power approach.

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Section: Introductionmentioning

confidence: 96%