Design of Off-Axis All-Reflective Three-Gear Zoom Optical System with Long Focal Length

Yiqing Cao

doi:10.3788/LOP202360

Journals >Laser & Optoelectronics Progress >Volume 60 >Issue 19 >Page 1908001 > Article

Laser & Optoelectronics Progress
Vol. 60, Issue 19, 1908001 (2023)

Design of Off-Axis All-Reflective Three-Gear Zoom Optical System with Long Focal Length

Yiqing Cao^1、2、*

Author Affiliations

¹School of Mechanical and Electrical Information Engineering, Putian University, Putian 351100, Fujian, China

²Fujian Laser Precision Machining Engineering Technology Research Center, Putian 351100, Fujian, China

show less

DOI: 10.3788/LOP202360 Cite this Article Set citation alerts

Yiqing Cao. Design of Off-Axis All-Reflective Three-Gear Zoom Optical System with Long Focal Length[J]. Laser & Optoelectronics Progress, 2023, 60(19): 1908001 Copy Citation Text

show less

Fig. 1. Structure and optical scheme of coaxial four-mirror reflective zoom optical system

Download full size

Flow chart of solving initial structure parameters of coaxial four-reflective mirrors zoom optical system using adaptive variation probability genetic algorithm

Fig. 2. Flow chart of solving initial structure parameters of coaxial four-reflective mirrors zoom optical system using adaptive variation probability genetic algorithm

Download full size

Fig. 3. Structure and optical scheme of off-axis four-mirror reflective three-gear zoom optical system. (a)

f^{'} = 300 m m

; (b)

f^{'} = 600 m m

; (c)

f^{'} = 900 m m

Download full size

Fig. 4. MTF curve diagram of off-axis four-mirror reflective three-gear zoom optical system.（a）

f^{'} = 300 m m

；（b）

f^{'} = 600 m m

；（c）

f^{'} = 900 m m

Download full size

Surface	Type	Radius /mm	Thickness /mm
Surface	Type	Radius /mm	$f^{'} = 300 m m$	$f^{'} = 600 m m$	$f^{'} = 900 m m$
STOP	Standard	Inifinity	150.00
	Coordinate Break		0.00
M₁	Even Asphere	-291.67	0.00
	Coordinate Break		-105.44
M₂	Even Asphere	-121.36	0.00
	Coordinate Break		141.82	118.73	112.19
M₃	Even Asphere	477.05	0.00
	Coordinate Break		-135.35	-116.87	-108.46
M₄	Even Asphere	132.27	118.30	169.87	230.43

Table 1. Structural parameters of off-axial four-mirror reflective three-gear zoom optical system

Mirror	Aspherical cofficient
Mirror	Conic	4^th order term	6^th order term	8^th order term	10^th order term
M₁	-1.114	-2.051×10^-10	-3.742×10^-15	2.194×10^-19	-3.764×10^-24
M₂	-3.544	6.310×10^-8	-5.512×10^-12	-2.048×10^-16	5.376×10^-20
M₃	16.528	5.847×10^-8	-6.097×10^-12	1.745×10^-16	-1.807×10^-20
M₄	-0.307	1.639×10^-8	-5.011×10^-12	1.830×10^-15	-2.237×10^-19

Table 2. Aspherical coefficients of each reflective mirror

Mirror	Tilt along X axis /（°）	Decenter along Y axis /mm
M₁	1.200	-130.000
M₂	-0.778	1.421
M₃	-10.526	-87.322
M₄	-5.729	57.525

Table 3. Final tilts and decenters of each mirror

No.	$f^{'} = 300 m m$		$f^{'} = 600 m m$		$f^{'} = 900 m m$
No.	X /（°）	Y /（°）	X /（°）	Y /（°）	X /（°）	Y /（°）
1	-0.2	-0.3	-0.15	-0.2	-0.1	-0.1
2	-0.14	-0.21	-0.105	-0.14	0.07	0.07
3	0	0	0	0	0	0
4	0.14	0.21	0.105	0.14	0.07	0.07
5	0.2	0.3	0.15	0.2	0.1	0.1

Table 4. Field of view angle selected for imaging performance analysis of optical system

Field of view angle /（°）	RMS radius /μm	Field of view angle /（°）	RMS radius /μm	Field of view angle /（°）	RMS radius /μm
Field of view angle /（°）	$f^{'} = 300 m m$	Field of view angle /（°）	$f^{'} = 600 m m$	Field of view angle /（°）	$f^{'} = 900 m m$
（-0.2°，-0.3°）	9.039	（-0.15°，-0.2°）	11.529	（-0.1°，-0.1°）	7.665
（-0.14°，-0.21°）	7.187	（-0.105°，-0.14°）	6.685	（-0.07°，-0.07°）	7.205
（0°，0°）	4.019	（0°，0°）	6.431	（0°，0°）	6.454
（0.14°，0.21°）	5.548	（0.105°，0.14°）	4.482	（0.07°，0.07°）	5.857
（0.2°，0.3°）	6.910	（0.15°，0.2°）	4.087	（0.1°，0.1°）	5.908

Table 5. RMS radii of spot diagram of field of view angles listed in Table 4 at three-gear zoom position of optical system

Yiqing Cao. Design of Off-Axis All-Reflective Three-Gear Zoom Optical System with Long Focal Length[J]. Laser & Optoelectronics Progress, 2023, 60(19): 1908001

Download Citation

Set citation alerts for the article

Tools

Set citation alerts for the article

Save the article for my favorites

Paper Information