spectrum n. (pl. -tra ) 1.【物理學(xué)】譜,光譜;波譜;能譜,質(zhì)譜。 2.【無線電】射頻頻譜;無線電(信號(hào))頻譜。 3.【心理學(xué)】(眼睛的)余像;殘像。 4.〔轉(zhuǎn)義〕范圍,幅度;(連續(xù)的)系列。 an absorption spectrum 吸收(光)譜。 a bright line spectrum 線狀光譜。 an optical spectrum 光譜。 a solar spectrum 太陽光譜。 a wide spectrum of opinion 意見的不同幅度甚大。
The concept of viffoal laser frequency stabilizaion is put fowi . the frequency stabilizaion at the center of doppler curve has been realized aller signal detecting , phase sensitive detecting , integrating and high voltage amplifying circuits with fm spectroscopy a frequency stability of l0 - , has been obtained with a reproducibility of l0 - 9 . hyperfine spectra of , ' , i , near 532nm have been studied via modul8tion tfansfer spectroscopy 利用fm光譜法將激光單次通過碘吸收室進(jìn)行線性吸收,再經(jīng)信號(hào)檢測(cè)、混頻、積分和高壓放大等伺服電路,實(shí)現(xiàn)了在多普勒曲線中心處的頻率穩(wěn)定,頻率穩(wěn)定度和復(fù)現(xiàn)性可達(dá)10 ~ ( - 9 )量級(jí)。