Parameters optimization of FLEET optical system

Jianxin Wang; Shuang Chen; Li Chen; Wenbin Yang; Rong Qiu; Fuzhong Bai; Tonghong Li

doi:10.12086/oee.2022.210318

Opto-Electronic Engineering, Volume. 49, Issue 4, 210318(2022)

Parameters optimization of FLEET optical system

Jianxin Wang^1,2、*, Shuang Chen³, Li Chen^3、*, Wenbin Yang³, Rong Qiu^1,2, Fuzhong Bai^4、*, and Tonghong Li⁵

¹Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China

²Sichuan Civil-military Integration Institute, Mianyang, Sichuan 621010, China

³Facility Design and Instrumentation Institute, China Aerodynamic Research and Development Center, Mianyang, Sichuan 621000, China

⁴School of Mechanical Engineering, Inner Mongolia University of Technology, Huhhot, Inner Mongolia 010051, China

⁵National Center of Quality Inspection and Testing on Diamond Tools, Ezhou, Hubei 436000, China

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Figures & Tables(9)

Fig. 1. FLEET experiment schematic diagram

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Fig. 2. Scaling calibration. (a) Original scale; (b) After threshold segmentation; (c) After tilt correction

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Fig. 3. Air fluorescent filament images excited by femtosecond laser with different focal length and laser energy. (a)~(c) With 300 mm focus length and 1 mJ, 2 mJ and 3 mJ laser energy respectively; (d)~(f) With 1000 mm focus length and 1 mJ, 2 mJ and 3 mJ laser energy respectively

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Fig. 4. Process for definition of effective area of fluorescent filament. (a) Projection directions; (b) One dimension curve of projection along x direction, I_y; (c) Projections of signal and background along y direction, I_s and I_n ; (d) I_sx curve before and after filtering in space frequency domain; (e) After space frequency filtering of I_sx and I_nx; (f) Effective area of fluorescent filament

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Fig. 5. Geometric feature extraction of fluorescent filament. (a) Result of binarization; (b) Center line extraction

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Fig. 6. Fluorescent filament SNR and length vs laser power and focal length. (a) SNR curve; (b) Filament length curve

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Fig. 7. The normalized peak density of air fluorescent filament for different time delay under different pressures

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Table 1. The maximum gray affected by laser power and focal length

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Table 1. The maximum gray affected by laser power and focal length

Laser energy /mJ	Focal length of focus lens/mm
Laser energy /mJ	175	300	500	1000	1500
0.5	23759	1216	764	750	无信号
1.0	205599	3840	2375	1950	无信号
1.5	345641	5377	3614	2882	1071
2.0	541298	9239	6504	3711	1265
2.5	575889	13876	7844	4508	1497
3.0	610190	17881	10900	5118	1795

Table 2. The laser power density at back focal plane with different laser power and focal length/(W/cm²)

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Table 2. The laser power density at back focal plane with different laser power and focal length/(W/cm²)

Laser energy /mJ	Focal length of focus lens/mm
Laser energy /mJ	175	300	500	1000	1500
0.5	7.22×10¹⁴	2.46×10¹⁴	8.84×10¹⁴	2.21×10¹³	9.82×10¹²
1.0	1.44×10¹⁵	4.91×10¹⁴	1.77×10¹⁴	4.42×10¹³	1.96×10¹³
1.5	2.17×10¹⁵	7.37×10¹⁴	2.65×10¹⁴	6.63×10¹³	2.95×10¹³
2.0	2.89×10¹⁵	9.82×10¹⁴	3.54×10¹⁴	8.84×10¹³	3.93×10¹³
2.5	3.61×10¹⁵	1.23×10¹⁵	4.42×10¹⁴	1.11×10¹⁴	4.91×10¹³
3.0	4.33×10¹⁵	1.47×10¹⁵	5.30×10¹⁴	1.33×10¹⁴	5.89×10¹³

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Jianxin Wang, Shuang Chen, Li Chen, Wenbin Yang, Rong Qiu, Fuzhong Bai, Tonghong Li. Parameters optimization of FLEET optical system[J]. Opto-Electronic Engineering, 2022, 49(4): 210318

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Paper Information

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Received: Sep. 30, 2021

Accepted: --

Published Online: May. 24, 2022

The Author Email: Wang Jianxin (;;), Chen Li (;;), Bai Fuzhong (;;)

DOI:10.12086/oee.2022.210318

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. The maximum gray affected by laser power and focal length

Table 1. The maximum gray affected by laser power and focal length

Table 2. The laser power density at back focal plane with different laser power and focal length/(W/cm2)

Table 2. The laser power density at back focal plane with different laser power and focal length/(W/cm2)

Table 2. The laser power density at back focal plane with different laser power and focal length/(W/cm²)

Table 2. The laser power density at back focal plane with different laser power and focal length/(W/cm²)