Chinese Optics, Volume. 15, Issue 1, 119(2022)
Fabrication of an ultra-narrow band-pass filter with 60 pm bandwidth in green light band
Fig. 1. Transmittance spectra of the designed ultra-narrow band-pass filter
Fig. 2. Variation of the transmittance of optical signal as a function of the number of film layers
Fig. 3. Sensitivity of film layer error on filter spectrum in each layer
Fig. 4. Change of optical monitoring signal by using two separated monitor glass plates
Fig. 5. Schematic diagram of the transmission spectrum measurement setup
Fig. 6. Measured transmission spectrum of the ultra-narrow band-pass filter
Fig. 7. Variation of spectral curves after randomly introducing the control errors
Fig. 8. Schematic diagram of the boundary between rough substrate surface and thin film
Table 1. [in Chinese]
View tableView in ArticleTable 1. [in Chinese]
Spectral filtering technique Spectral fineness Optical efficiency Wave option Structure Stability Acoustoptic modulation 1~0.01 nm Medium Fast modulated Complex Good Atomic filtering 1~0.001 nm High−low Fixed, fewer options Complex Not bad F-P etalon 1~0.002 nm High Fixed, more options Somewhat complex Good Film interference 1~0.03 nm High Fixed, more options Simple Very good
Table 2. [in Chinese]
View tableView in ArticleTable 2. [in Chinese]
Bandwidth (pm) Peak transmittance (%) Central wavelength (nm) A. Design value (without absorption) 57 93.4 532.00 B. Design value (with absorption) 63 74.3 532.00 C. Measured value 62 62.6 532.009 D. Deviation value (from B) −1 −11.7 +0.009
Table 3. [in Chinese]
View tableView in ArticleTable 3. [in Chinese]
Materials Refractive index, n@ 532nm,20~40 ℃ Refractive-index temperature coefficient, dn/dT (10−6/℃) Linear expansion coefficient, α (10−6/℃) @0~100 ℃ Crystal Quartz (CQ) 1.55 5.2 13.4 Fused quartz (JGS-1) 1.46 10.0 0.55 Glass ceramics (Zerodur) 1.54 14.3 0.05 Glass (K9, BK7) 1.52 3.0 7.4 Sapphire (Al2O3) 1.77 13.1 6.7 SiO2 film 1.44 9.0 0.55 Ta2O5 film 2.11 20.0 1.1
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Kai-xuan WANG, Gang CHEN, Ding-quan LIU, Chong MA, Qiu-yu ZHANG. Fabrication of an ultra-narrow band-pass filter with 60 pm bandwidth in green light band[J]. Chinese Optics, 2022, 15(1): 119
Category: Original Article
Received: Apr. 23, 2021
Accepted: Aug. 11, 2021
Published Online: Jul. 27, 2022
The Author Email: Ding-quan LIU (dqliu@mail.sitp.ac.cn)
