Effect of Optical Axis Orientation and Thickness of Crystal on Performance of Double Wedge Depolarizer

Yangming Jin; Weimin Shen

doi:10.3788/AOS201737.0822001

Acta Optica Sinica, Volume. 37, Issue 8, 0822001(2017)

Effect of Optical Axis Orientation and Thickness of Crystal on Performance of Double Wedge Depolarizer

Yangming Jin^1,2 and Weimin Shen^1,2、*

¹ Key Lab of Modern Optical Technologies of Education Ministry of China, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, Jiangsu 215006, China

² Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, Jiangsu 215006, China

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Figures & Tables(10)

Fig. 1. Schematic of double wedge depolarizer structure

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Fig. 2. Relationship between optical axis orientation of crystal and polarization sensitivity of optical system

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Fig. 3. Relationship between wedge angle and polarization sensitivity of optical system

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Fig. 4. Relationship between pupil diameter and polarization sensitivity of optical system

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Fig. 5. Polarization sensitivity curves of optical system with type II polarizer

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Fig. 6. Optical path of design example

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Fig. 7. Polarization sensitivity of grating imaging spectrometer before using a depolarizer

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Fig. 8. Polarization sensitivity of grating imaging spectrometer after using a depolarizer

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Table 1. Polarization sensitivities of optical systems with type I and type II depolarizers

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Table 1. Polarization sensitivities of optical systems with type I and type II depolarizers

Type	θ₁ /(°)	θ₂ /(°)	Polarization sensitivity of optical system
I	±45	±90,0	P_I= 2· $\begin{matrix} \frac{J_{1} (δ)}{δ} \end{matrix}$ ·cos φ₁\| ( T _x₀-T _y₀ ) / ( T _x₀+T _y₀ ) \|× 100%
II	-45	45	P_II= $\begin{matrix} \frac{J_{1} (2 δ)}{δ} \end{matrix}$ ·cos( φ₂-φ₁ ) \| ( T _x₀-T _y₀ ) / ( T _x₀+T _y₀ ) \|× 100%
II	45		-45

Table 2. Indexes of design example
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Table 2. Indexes of design example
Index Value
Spectral range 0.4-1.0 μm
Fore-optics focal length 67.47 mm
Fore-optics F -number 3.5
Field 6.92°
Spectral channel 128
Sampling rate 3
Detector pixel size 16 μm

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Yangming Jin, Weimin Shen. Effect of Optical Axis Orientation and Thickness of Crystal on Performance of Double Wedge Depolarizer[J]. Acta Optica Sinica, 2017, 37(8): 0822001

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