Abstract
We report on a millijoule-level Yb-doped photonic crystal fiber (PCF) laser passively Q-switched with AlGaInAs quantum wells (QWs). Three types of AlGaInAs devices with different QW numbers are fabricated to investigate the performance. With 50 groups of three AlGaInAs QWs as a saturable absorber (SA), the PCF laser generates an average power of 7.1 W with a pulse repetition rate of 6.5 kHz at a pump power of 16 W, corresponding to the pulse energy of 1.1 mJ. The maximum peak power is up to 110 kW.
Highlights
High-power diode-pumped double-clad rare-earth doped fiber lasers have been proved to be efficient and compact with excellent beam quality, high efficiency, and good thermal management [1,2,3]
The conventional large-core fibers suffer from mode-quality degradation and their long lengths usually lead to long pulse widths and low peak powers
With 50 groups of three AlGaInAs quantum wells (QWs) as a saturable absorber and under a pump power of 16 W, the photonic crystal fiber (PCF) laser generates an average power of 7.1 W at the pulse repetition rate of 6.5 kHz, corresponding to a pulse energy of approximately 1.1mJ
Summary
High-power diode-pumped double-clad rare-earth doped fiber lasers have been proved to be efficient and compact with excellent beam quality, high efficiency, and good thermal management [1,2,3]. The conventional large-core fibers suffer from mode-quality degradation and their long lengths usually lead to long pulse widths and low peak powers For improving these deficiencies, photonic crystal fibers (PCFs) have been developed to provide large single-mode cores and high absorption efficiencies. The PCF was recently employed to demonstrate a passively Qswitched laser with a Cr4+:YAG crystal as a saturable absorber in which under a pump power of 14.2 W, an average output power of 3.4 W with a repetition rate of 5.6 kHz was generated, corresponding to a pulse energy of 630 μJ [11]. With 50 groups of three AlGaInAs QWs as a saturable absorber and under a pump power of 16 W, the PCF laser generates an average power of 7.1 W at the pulse repetition rate of 6.5 kHz, corresponding to a pulse energy of approximately 1.1mJ. We calculated the peak power by integrating the photodiode traces and found its maximum value to reach 110 kW
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