Optimization Method for Double-Layer Diffractive Elements with Broad Spectral Bandwidth, Wide Field of View and Wide Temperature Range

$DLDOE diffraction efficiency of TABIADE maximization method and BIADE maximization method changes with incident angle and ambient temperature. (a) Incident angle-temperature-diffraction efficiency relationship diagram for TABIADE maximization method; (b) incident angle-temperature-diffraction efficiency relationship diagram for BIADE maximization method; (c) relationship diagram between BIADE and temperature for two methods; (d) relationship diagram between BIADE and incident angle for two methods$

Fig. 1. DLDOE diffraction efficiency of TABIADE maximization method and BIADE maximization method changes with incident angle and ambient temperature. (a) Incident angle-temperature-diffraction efficiency relationship diagram for TABIADE maximization method; (b) incident angle-temperature-diffraction efficiency relationship diagram for BIADE maximization method; (c) relationship diagram between BIADE and temperature for two methods; (d) relationship diagram between BIADE and incident angle for two methods

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$Layout diagram of mid-wave infrared refraction-diffraction hybrid system$

Fig. 2. Layout diagram of mid-wave infrared refraction-diffraction hybrid system

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$MTF of mid-wave infrared refraction-diffraction hybrid system. (a) -40 ℃; (b) 20 ℃; (c) 60 ℃$

Fig. 3. MTF of mid-wave infrared refraction-diffraction hybrid system. (a) -40 ℃; (b) 20 ℃; (c) 60 ℃

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$Effect of diffraction efficiency on MTF at different temperatures. (a) -40 ℃; (b) 20 ℃; (c) 60 ℃$

Fig. 4. Effect of diffraction efficiency on MTF at different temperatures. (a) -40 ℃; (b) 20 ℃; (c) 60 ℃

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Table 1. Design results of double-layer diffraction element

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Table 1. Design results of double-layer diffraction element

Index	TABIADE method	BIADE method
Ambient temperature /℃	-40‒60
Incident angle /（°）	0‒7
TABIADE /%	94.93	84.29
Design order （Si）	28	93
Design order （Ge）	-27	-92
H₁ of Si /μm	44.333	150.871
H₂ of Ge /μm	-34.287	-119.612

Table 2. Design indicators of infrared refraction-diffraction hybrid imaging system
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Table 2. Design indicators of infrared refraction-diffraction hybrid imaging system
Parameter Value
Working waveband /μm 3‒5
F number 2
Focal length /mm 100
Field of view /（°） 14
Working temperature /℃ -40‒60

Table 3. Parameters of optical structure of mid-wave infrared refraction-diffraction hybrid system containing double- layer diffractive elements

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Table 3. Parameters of optical structure of mid-wave infrared refraction-diffraction hybrid system containing double- layer diffractive elements

Surface No.	Type	Radius / mm	Thickness / mm	Glass
0	Standard spherical	Infinity	Infinity	Air
1	Standard spherical	69.2185	3.7573	Ge
2	Diffraction surface	53.5502	0.0500	Air
3	Diffraction surface	53.5502	6.9766	Si
4	Standard spherical	101.0680	14.9511	Air
5	Standard spherical	-61.0756	5.6612	AgCl
6	Standard spherical	-62.6938	18.0383	Air
7	Standard spherical	Infinity	0.1494	Air
8	Standard spherical	20.3031	2.4303	KCl
9	Standard spherical	16.9518	47.5090	Air
10	Standard spherical	Infinity	—	Air

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Zilong Liu, Yuan Hu. Optimization Method for Double-Layer Diffractive Elements with Broad Spectral Bandwidth, Wide Field of View and Wide Temperature Range[J]. Acta Optica Sinica, 2025, 45(4): 0405002

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Paper Information

Category: Diffraction and Gratings

Received: Oct. 28, 2024

Accepted: Dec. 27, 2024

Published Online: Feb. 20, 2025

The Author Email: Hu Yuan (hycust@163.com)

DOI:10.3788/AOS241681

CSTR:32393.14.AOS241681

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Design results of double-layer diffraction element

Table 1. Design results of double-layer diffraction element

Table 2. Design indicators of infrared refraction-diffraction hybrid imaging system

Table 2. Design indicators of infrared refraction-diffraction hybrid imaging system

Table 3. Parameters of optical structure of mid-wave infrared refraction-diffraction hybrid system containing double- layer diffractive elements

Table 3. Parameters of optical structure of mid-wave infrared refraction-diffraction hybrid system containing double- layer diffractive elements