R-C Telescope Alignment Method Based on Astigmatism Correction of Symmetrical Field of View Misalignment

Fig. 4. Aberration field during the first round of adjustment. (a) Astigmatism after adjusting decenter and tilt in the yoz plane; (b) astigmatism after adjusting decenter and tilt in the xoz plane; (c) coma after the first round of adjustment

Download full size

Fig. 5. Picture of experiment layout

Download full size

Fig. 6. System wave aberration of different fields. (a) (0°,0°); (b) (0°,-0.1°); (c) (0°,0.1°)

Download full size

Table 1. Structural parameters of R-C telescope
View table
Table 1. Structural parameters of R-C telescope
Parameter Main mirror Secondary mirror
Type Quadratic surface Quadratic surface
Aspheric coefficient -1.5354 -8.8134
Radius of curvature /mm -833.33 -571.4286
Thickness /mm -250 400

Table 2. Alignment process of the secondary mirror

View table

Table 2. Alignment process of the secondary mirror

No.	Misalignment of the secondary mirror				Aberration coefficient /λ
No.	$X_{D E_{S M}}$ /mm	$Y_{D E_{S M}}$ /mm	$A_{D E_{S M}}$ /（°）	$B_{D E_{S M}}$ /（°）	C₇（0°，0°）	C₈（0°，0°）	C₅（0°，0.1°）	C₅（0°，-0.1°）	C₅（0.1°，0°）	C₅（-0.1°，0°）
0	-0.40	0.30	-0.10	-0.15	3.16	-2.25	-0.088	-0.042	0.008	0.065
1	0.32	-0.21	-0.10	-0.15	0	0	-0.097	-0.0024	0.115	-0.027
1	-0.48	0.29	-0.049	-0.081	2.02	-1.17	-0.047	-0.047	0.047	0.047
2	0.11	-0.18	-0.049	-0.081	0	0	-0.066	-0.039	0.063	0.063
2	-0.058	0.024	-0.0023	-0.004	1.04	-0.87	-0.047	-0.047	0.047	0.047
3	0.0054	-0.008	-0.0023	-0.004	0	0	-0.058	-0.046	0.048	0.047
3	0	0	0	0	0	0	-0.047	-0.047	0.047	0.047

Table 3. The system aberration coefficients and wave aberration after alignment
View table
Table 3. The system aberration coefficients and wave aberration after alignment
Field of view Aberration coefficient Wave aberration /λ
C₅ C₆ C₇ C₈
（0，0） -0.0220 0.0381 0.0606 0.0516 0.0730
（0，0.1°） -0.0533 -0.0501 0.1024 -0.0643 0.0834
（0，-0.1°） -0.0506 0.0556 0.1132 0.0637 0.0808

Tools

Get Citation

Copy Citation Text

Hao Wang, Lei Zhang. R-C Telescope Alignment Method Based on Astigmatism Correction of Symmetrical Field of View Misalignment[J]. Laser & Optoelectronics Progress, 2025, 62(2): 0211003

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites