这种光束与仪器和工业生产用的激光不同。
The beam is different from the lasers used in Pointers and industrial applications.
遗憾地是，发射这种光束的仪器重达数百吨， 并且造价高达l亿美元，甚至更多。
Unfortunately, the machines needed to generate such beams weigh several hundred tonnes and cost $100m or more to build.
采用低压驱动电路驱动压电陶瓷相移器对参考光束进行相移，从而使仪器质量减轻、体积缩小、成本降低。
The low-voltage driving circuit is adopted to drive a piezoelectric ceramic phase shifter to shift the phase of the reference beam, so as to make the instrument lighter, smaller and cheaper.
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