如果激光光束洞和激光输出束出现在自由的空间，而不是波导（如光纤激光器），那么充其量也就是低阶高斯光束。
The beam in the cavity and the output beam of the laser, if they occur in free space rather than waveguides (as in an optical fiber laser), are, at best, low order Gaussian beams.
装置最显著的特点就是用单束光纤代替了国外通常采用的两束光纤(送光束和受光束)的功能。
Its most remarkable feature consists in the substitution of the single fiber optic bundle for the double bundle commonly used in other countries.
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