UV by the fourth harmonic generation of compact side-pumped Yb:YAG laser emission
| Autor: | Alan Hays, Chris McIntosh, Lew Goldberg, Brian Cole, Tom DiLazaro |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Pulse repetition frequency
Materials science business.industry Energy conversion efficiency Second-harmonic generation Saturable absorption 02 engineering and technology Output coupler 021001 nanoscience & nanotechnology Laser 01 natural sciences Q-switching law.invention 010309 optics Optics law 0103 physical sciences High harmonic generation Optoelectronics 0210 nano-technology business |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2213452 |
| Popis: | We present a compact, side pumped passively Q-switched Yb:YAG laser that was operated in a burst mode with pump durations of 2-4 ms at low duty cycles. Intra-pump pulse Q-switched pulse repetition frequencies varied from 5-20 kHz depending on the transmission of the Cr:YAG saturable absorber, which was varied from 70% to 94%. Pump duration, pulse repetition frequency and output coupler reflectivity were optimized to yield maximum Yb:YAG laser average power and laser efficiency, while providing sufficient peak intensity, typically 0.3-1 MW, to enable efficient forth harmonic generation (FHG). Pulse energies and durations were in ranges of 0.3-1.8 mJ and 1.5-7ns, respectively, dependent on the unbleached transmission of the Cr:YAG saturable absorber. We achieved an optical efficiency of greater than 15% for the Yb:YAG laser. Extra-cavity 515 nm second harmonic generation (SHG) was achieved using a 5mm long KTP crystal. The 515 nm light was then frequency doubled by focusing it into a 7mm long BBO crystal, resulting in a 15% conversion efficiency from 1030nm to 257.5 nm, with an average UV power greater than 100 mW. |
| Databáze: | OpenAIRE |
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