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聲光偏轉(zhuǎn)器物理原理-資料下載頁

2025-06-07 18:19本頁面
  

【正文】 升時(shí)間。(Proportional to the time the acoustic wave takes to cross the laser beam and, therefore, the time it takes the beam to respond to a change in the RF signal. The rise time can be reduced by reducing the beam’s width.)調(diào)制帶寬(Modulation bandwidth) :在可調(diào)幅下光束的做大頻率。與上升時(shí)間一樣,可以通過降低激光束的直徑來增加。效率(Efficiency) :一級(jí)條紋和未偏轉(zhuǎn)零級(jí)條紋的比值。(The fraction of the zero order beam which can be diffracted into the “1st” order beam).消光比(Extinction ratio):當(dāng)聲波分別是“開”和“關(guān)”時(shí),一級(jí)光束的最大光強(qiáng)和最小光強(qiáng)的比值。 頻移(Frequency shift) (F):衍射光束與入射光束的頻率差值。頻移等于聲波頻率,向上移或者下移依視方向而定。分辨率(Resolution) (N):解析點(diǎn)的數(shù)目,依據(jù)Rayleigh判據(jù)描述的、由偏轉(zhuǎn)器生成的、相應(yīng)的偏轉(zhuǎn)光束的分離位置的最大數(shù)目。(The number of resolvable points, which a deflector can generate corresponding to the maximum number of separate positions of the diffracted light beam as defined by the Rayleigh criterion).射頻功率(RF Power) :驅(qū)動(dòng)提供的電能。聲波功率(Acoustic power) :由壓電傳感器產(chǎn)生的晶體中的聲波功率。比射頻功率略低如同機(jī)電轉(zhuǎn)換率低于1。
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