Wavelength Calibration of Infrared Spectrometer Based on Hollow Planar Waveguide

Yue Wu; Jiaxiang Liu; Yonghua Fang; Min Yang

doi:10.3788/AOS201838.1130002

Acta Optica Sinica, Volume. 38, Issue 11, 1130002(2018)

Wavelength Calibration of Infrared Spectrometer Based on Hollow Planar Waveguide

Yue Wu^1,2,3、*, Jiaxiang Liu^1,3, Yonghua Fang^1,3、*, and Min Yang^1,2,3

Author Affiliations

¹ Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China

² University of Science and Technology of China, Heifei, Anhui 230026, China

³ Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei, Anhui 230031, China

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Figures & Tables(11)

Fig. 1. Structural schematics of the hollow planar waveguide infrared spectrometer. (a) Schematic of beam propagation in space; (b) scheme of optical path design

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Fig. 2. Flow chart of laboratory wavelength calibration

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Fig. 3. Sketch map of laboratory wavelength calibration

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Fig. 4. Physical map of wavelength calibration device in laboratory

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Fig. 5. Relation of pixel and response at different wavelengths

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Fig. 6. Fitting curves of wavelength calibration

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Fig. 7. Fitting residual of wavelength calibration

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Table 1. Specific parameters of spectrometer
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Table 1. Specific parameters of spectrometer
Parameter Value
Wavelength range /μm 8-12
Spectral sampling interval /μm 0.0625
Numerical aperture 0.22
Detector array size 64×1
Detector pixel size /(mm×mm) 0.5×1.5

Table 2. Parameters of PL2-M CO2 laser

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Table 2. Parameters of PL2-M CO2 laser

Parameter	Value
Wavelength range /μm	9.1-10.9
Mode	>90% TEM₀₀, M²<1.25
Amplitude stability	±1% short term (unstabilized)
Frequency stability /(kHz·s^-1)	200
Beam diameter (1/e²)	4.8 mm@output coupler
Beam divergence /mrad	6.5

Table 3. Results of wavelength calibration
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Table 3. Results of wavelength calibration
Central wavelength /μm Pixel Spectral resolution /nm
9.261 48.925 139
9.488 45.925 144
9.621 44.822 137
10.233 37.558 134
10.476 34.535 129
10.764 30.828 135

Table 4. Calculation results of two fitting methods

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Table 4. Calculation results of two fitting methods

Central Wavelength /μm	Pixel	1st order polynomial fitting		3rd order polynomial fitting
Central Wavelength /μm	Pixel	Fitted value /μm	Error /μm	Fitted value /μm	Error /μm
8.50	60.55	8.284	-0.216	8.461	-0.039
11.52	13.60	12.228	0.707	11.415	-0.100

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Yue Wu, Jiaxiang Liu, Yonghua Fang, Min Yang. Wavelength Calibration of Infrared Spectrometer Based on Hollow Planar Waveguide[J]. Acta Optica Sinica, 2018, 38(11): 1130002

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