利用改进的脉冲Nd:YAG激光器，对激光冲击打孔加工无锥度直孔进行了实验研究。在优化激光脉冲峰值功率和脉冲能量、辅助气压参数的基础上，通过比较实验证明，能量递增组合脉冲是实现无锥度直孔加工的有效方式，增加脉冲组合中脉冲的个数可加工出负锥度的孔；激光焦点位置是影响孔锥度的重要因素，焦点位于材料表面上方1.1~1.7 mm有利于减小锥度。在厚度为1.5，3.0 mm的镍基高温合金材料上，获得孔径分别为480，510 μm的直孔，重复打孔孔径误差约30 μm，孔锥度<1%。给出了可实用于激光冲击打孔的直孔加工方法和脉冲激光器，并可用于其他材料的加工。

Experiments of laser percussion drilling are carried out on nickel-based superalloy using a modified pulsed Nd:YAG laser. Peak power, pulse energy and assist gas pressure are optimized experimentally. Experimental results demonstrate that a pulse combination with increasing pulse energy is an effective method to produce non-tapered holes. Even negative taper holes can be produced through increasing the number of pulses in the pulse combination. Focal position is an important factor that affects the taper of holes, and 1.1~1.7 mm above the surface of the sample helps reducing the taper of holes. Non-tapered holes with diameter of 480 and 510 μm are drilled on nickel-based superalloy with thickness of 1.5 and 3.0 mm. Variation of hole diameter is about 30 μm, and hole taper is less than 1%. A feasible method of producing parallel holes and an applied Nd:YAG laser have been presented for laser percussion drilling, may also be used on other materials.