研究目的
Investigating the performance of a high peak power, high repetition rate Cr2+:ZnS passively Q-switched Ho:YAG ceramic laser and the influence of the initial transmission of the saturable absorber on the laser performance.
研究成果
The study successfully demonstrated a Cr2+:ZnS PQS Ho:YAG ceramic laser with high peak power, narrow pulse width, and high repetition rate. The highest peak power of 75.9 kW was achieved at a PRF of 10.1 kHz, corresponding to a pulse energy of 1.02 mJ and an output power of 10.3 W. The results indicate the potential for further improvements in laser performance with optimized SA parameters.
研究不足
The study was limited by the damage threshold of the Cr2+:ZnS saturable absorber, which was estimated to be ~1.8 J cm?2. Higher pulse energy and peak power could potentially be achieved by enlarging the laser spot radius on the SA and/or improving the coating quality of the SA.
1：Experimental Design and Method Selection:
The study employed a compact L-shaped resonator for the PQS Ho:YAG ceramic laser to achieve high output power and narrow pulse width. The pump radius into the Ho:YAG ceramic was set to a small value of 220 μm.
2：Sample Selection and Data Sources:
Two polycrystalline Cr2+:ZnS saturable absorbers with initial transmissions of 80% and 90% were used. The Ho:YAG ceramic had a dopant concentration of
3：0-at.% and size of 5 × 3 × 5 mmList of Experimental Equipment and Materials:
The setup included a Tm:YLF laser as the pump source, Cr2+:ZnS saturable absorbers, and various mirrors (M1, M2, M3) with specific coatings.
4：Experimental Procedures and Operational Workflow:
The laser performance was evaluated in both continuous wave (CW) and PQS regimes, with measurements of output power, pulse width, pulse energy, and peak power.
5：Data Analysis Methods:
The relationships between pulse energy, peak power, and absorbed pump power were analyzed, and the beam quality M2 factor was measured using the knife-edge technique.
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