Design and Performance of Hefei Infrared Free-Electron Laser Facility

Chen Gao; Jun Bao; Yingui Zhou; Yuanjun Yang; Song Sun; Xiaodi Zhu; Heting Li; Shancai Zhang; Lin Wang

doi:10.3788/CJL230996

Chinese Journal of Lasers, Volume. 51, Issue 8, 0818001(2024)

Design and Performance of Hefei Infrared Free-Electron Laser Facility

Chen Gao^1,2、*, Jun Bao¹, Yingui Zhou¹, Yuanjun Yang^1,3, Song Sun^1,4, Xiaodi Zhu¹, Heting Li¹, Shancai Zhang¹, and Lin Wang¹

Author Affiliations

¹National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, Anhui , China

²School of Physical Sciences, University of Chinese Academy of Science, Beijing 101408, China

³School of Physics, Hefei University of Technology, Hefei 230009, Anhui , China

⁴School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, Anhui , China

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Figures & Tables(17)

Fig. 1. Layout of beamline for Hefei Infrared Free-Electron Laser (FEL) Facility. (a) Conceptual scheme; (b) 3D configuration; (c) beamline tubes and mirror chambers in the light source hall; (d) beamline tubes and mirror chambers in the experimental station hall

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Fig. 2. Photographs of the off-axis parabolic mirrors. (a) Photograph of two pieces of 90° off-axis parabolic mirrors; (b) photograph of a mirror mounted on a multidimensional precision adjustable stage

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Fig. 3. Beam diameter varies with the propagation distance for far-IR oscillator coupled with 4 mm hole

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Fig. 4. Beam diameter varies with the propagation distance for mid-IR oscillator coupled with 3.5 mm hole

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Fig. 5. Beam spot diameter at the focal point of surface/interface experimental station varies with the wavelength for far-IR (the three sections correspond to the three coupling holes of far-IR oscillator and there are overlaps between the sections)

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Fig. 6. Beam spot diameter at the focal point of surface/interface experimental station varies with the wavelength for mid-IR (the four sections correspond to the four coupling diameters of mid-IR oscillator and there are overlaps between the sections)

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Fig. 7. Typical IR focal spot pictures. (a) Spot recorded with an IR-Viewer at the exit of the beamline; (b) spot reshaped with spatial filtering at experimental station

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Fig. 8. Transmission efficiency varies of surface/interface experimental station with wavelength for far-IR (the three sections correspond to the three coupling holes of far-IR oscillator and there are overlaps between the sections)

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Fig. 9. Transmission efficiency of surface/interface experimental station varies with wavelength for mid-IR (the four sections correspond to the four coupling holes of mid-IR oscillator and there are overlaps between the sections)

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Fig. 10. Layout of the laser diagnostics. The inset at low-right corner is the photograph

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Fig. 11. IR FEL pulse structure measured by thermoelectric detector

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Fig. 12. Mid-IR spectrum (the fitted central wavelength is 16 μm and spectral width is 1.8 μm)

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Table 1. Corresponding relationship between coupling diameter and wavelength for far-IR oscillator
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Table 1. Corresponding relationship between coupling diameter and wavelength for far-IR oscillator
Coupling diameter /mm FEL wavelength /μm
1.5 40‒90
2.5 70‒150
4.0 100‒200

Table 2. Corresponding relationship between coupling diameter and wavelength for mid-IR oscillator
View table
Table 2. Corresponding relationship between coupling diameter and wavelength for mid-IR oscillator
Coupling diameter /mm FEL wavelength /μm
1.0 2.5‒10
1.5 5‒15
2.0 8‒20
3.5 15‒50

Table 3. Beam parameters for mid-IR oscillator
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Table 3. Beam parameters for mid-IR oscillator
Parameter Value
Coupling diameter /mm 1.0, 1.5, 2.0, 3.5
Radius of beam waist ω₀ /mm 0.78‒3.5
Radius of beam spot at cavity mirror 3.5 ω_m /mm 9‒42
Divergence angle at far field ω_f /mrad 1.02‒4.55

Table 4. Variations of beam waist radius and divergence angle at far field with FEL wavelength for mid-IR oscillator

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Table 4. Variations of beam waist radius and divergence angle at far field with FEL wavelength for mid-IR oscillator

FEL wavelength /μm	Radius of beam waist /mm	Divergence angle at far field /mrad
2.5	0.782781610	1.016599493
5	1.107020369	1.437688791
7.5	1.355817519	1.760801973
10	1.565563219	2.033198986
12.5	1.750352891	2.273185572
15	1.917415524	2.490150031
17.5	2.071045470	2.689669442
20	2.214040738	2.875377581
22.5	2.348344829	3.049798479
25	2.475372797	3.214769866
27.5	2.596192892	3.371679081
30	2.711635038	3.521603946
32.5	2.822359231	3.665401599
35	2.928900592	3.803767003
37.5	3.031700138	3.937272907
40	3.131126439	4.066397972
43.5	3.265240978	4.240572698
45	3.321061106	4.313066372
47.5	3.412065932	4.431254456
50	3.500705782	4.546371145

Table 5. Parameters of 90° off-axis parabolic mirrors

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Table 5. Parameters of 90° off-axis parabolic mirrors

Mirror	Mirror type	Projection diameter /mm	Focal length /mm
M1	Parabolic	150	820
M3	Parabolic	150	590
M7	Parabolic	150	7200
M9	Parabolic	150	1000
M10	Parabolic	150	1000
M11	Parabolic	150	1000
M13	Parabolic	150	1000
Others	Planar	150	∞

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Chen Gao, Jun Bao, Yingui Zhou, Yuanjun Yang, Song Sun, Xiaodi Zhu, Heting Li, Shancai Zhang, Lin Wang. Design and Performance of Hefei Infrared Free-Electron Laser Facility[J]. Chinese Journal of Lasers, 2024, 51(8): 0818001

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Paper Information

Category:

Received: Jul. 6, 2023

Accepted: Sep. 5, 2023

Published Online: Mar. 29, 2024

The Author Email: Gao Chen (gaochen@ucas.edu.cn)

DOI:10.3788/CJL230996

CSTR:32183.14.CJL230996

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Corresponding relationship between coupling diameter and wavelength for far-IR oscillator

Table 1. Corresponding relationship between coupling diameter and wavelength for far-IR oscillator

Table 2. Corresponding relationship between coupling diameter and wavelength for mid-IR oscillator

Table 2. Corresponding relationship between coupling diameter and wavelength for mid-IR oscillator

Table 3. Beam parameters for mid-IR oscillator

Table 3. Beam parameters for mid-IR oscillator

Table 4. Variations of beam waist radius and divergence angle at far field with FEL wavelength for mid-IR oscillator

Table 4. Variations of beam waist radius and divergence angle at far field with FEL wavelength for mid-IR oscillator

Table 5. Parameters of 90° off-axis parabolic mirrors

Table 5. Parameters of 90° off-axis parabolic mirrors