Infrared and Laser Engineering, Volume. 51, Issue 9, 20210900(2022)
Development of the aluminum substrate reflective film in the off-axis three-mirror optical system
Figures & Tables(8)
Fig. 3. Theoretical design curve of S- and P-light reflectivity at the incidence of 38.5°
Fig. 4. Theoretical design curve S- and P-light reflection phase at the incidence of 38.5°
Table 1. Main technical specifications of the off-axis three-mirror optical system
View tableView in ArticleTable 1. Main technical specifications of the off-axis three-mirror optical system
Parameters Value Wavelength/nm 1550 Field of view/mrad 15 Magnification 6× Entrance pupil diameter/mm 125 Isolation >80 dB
Table 2. Technical specifications of mirrors in the off-axis three-mirror optical system
View tableView in ArticleTable 2. Technical specifications of mirrors in the off-axis three-mirror optical system
Parameters Parameter values Incident angle/(°) 38.5 P- and S-light phase delay <1°@1550 nm Film polarization >99.5%@(1550±5) nm
Table 3. Test methods and results of film environment
View tableView in ArticleTable 3. Test methods and results of film environment
Items Results Methods Adhesion test No stripping after pulling the 2 cm-zwide tape up from the film Stick a piece of 2 cm-wide adhesive tape (peel strength≥2.74 N/cm) firmly onto the surface of the film layer of the test piece, and pull up quickly. Damp heat test ① (50±2) ℃, 95-100%, 24 h; ② No peeling, stripping, cracking or bubbling on the film layer after the test. Keep the test piece in an environment 95%-100% in humidity and (50±2) ℃ in temperature for 24 h. Temperature test ① (−62±2) ℃, (70±2) ℃ for 2 h each; ② No peeling, stripping, cracking or bubbling on the film layer after the test Keep the test piece under (−62±2) ℃ and (70±2) ℃ for 2 h each, and place it under room temperature (16-32 ℃) (temperature change in the test chamber no faster than 2 ℃ /min), for test of adhesion
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Pengquan Zhang, Jiaqi Chen, Yijun Shi. Development of the aluminum substrate reflective film in the off-axis three-mirror optical system[J]. Infrared and Laser Engineering, 2022, 51(9): 20210900
Paper Information
Category: Materials & Thin films
Received: Nov. 25, 2021
Accepted: Dec. 25, 2021
Published Online: Jan. 6, 2023
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