Thermal Blooming Effect of Array Beams Under Buoyancy Convection in Closed Channel

Wansheng Liu; Zhijun Yuan; Hanbin Wang; Yuqiao Xian; Mengqi Su; Bing He; Jun Zhou

doi:10.3788/AOS202242.0114001

Acta Optica Sinica, Volume. 42, Issue 1, 0114001(2022)

Thermal Blooming Effect of Array Beams Under Buoyancy Convection in Closed Channel

Wansheng Liu^1,2, Zhijun Yuan¹, Hanbin Wang^1,3, Yuqiao Xian^1,2, Mengqi Su^1,2, Bing He^1、*, and Jun Zhou^1、**

¹Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

³School of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150006, China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(10)

Fig. 1. Diagram of mesh division for finite element calculation

Download full size

Fig. 2. Temperature distribution, amplitude and direction of air velocity near laser source, and intensity distribution at focal point when only considering heat conduction and buoyancy convection. (a)(d) Only considering heat conduction; (b)(c)(e) considering buoyancy convection

Download full size

Fig. 3. Array cells with different arrangements. (a) Horizontal; (b) vertical; (c) positive triangular; (d) inverted triangular; (e) slanting

Download full size

Fig. 4. Amplitude and direction of air velocity near laser source and intensity distributions at focal point under horizontal and vertical arrangements. (a1)(a2) Left beam of horizontal arrangement; (b1)(b2) middle beam of horizontal arrangement; (c1)(c2) right beam of horizontal arrangement; (d1)(d2) upper beam of vertical arrangement; (e1)(e2) middle beam of vertical arrangement; (f1)(f2) lower beam of vertical arrangement

Download full size

Fig. 5. Amplitude and direction of air velocity near laser source and intensity distributions at focal point under triangular arrangements. (a1)(a2) Left beam of positive triangular arrangement; (b1)(b2) middle beam of positive triangular arrangement; (c1)(c2) right beam of positive triangular arrangement; (d1)(d2) left beam of inverted triangular arrangement; (e1)(e2) middle beam of inverted triangular arrangement; (f1)(f2) right beam of inverted triangular arrangement

Download full size

Fig. 6. Amplitude and direction of air velocity near laser source and intensity distributions at focal point under slanting arrangement. (a1)(a2) Left beam; (b1)(b2) middle beam; (c1)(c2) right beam

Download full size

Fig. 7. Centroid drift in y direction, centroid drift in z direction, and relationship between beam quality and axial wind speed of single beam and multiple beams when only considering heat conduction and considering buoyancy convection. (a) Centroid drift in y direction; (b) centroid drift in z direction; (c) beam quality

Download full size

Table 1. Parameter selection of numerical simulation

View table

Table 1. Parameter selection of numerical simulation

Laserwavelengthλ /nm	Laserpowerp /W	AirpressureP /(10⁵ Pa)	InitialtemperatureT /K	Absorptioncoefficientα /(10^-5 m^-1)	Waistradiusa /mm	Radius ofchanneld /mm	Observationdistancez /m	Focallengthf /m
1064	10000	1.01	293.15	1.2	4	100	5	5

Table 2. Mesh division for finite element calculationmm
View table
Table 2. Mesh division for finite element calculationmm
Distance from centerarea R Mesh cell size r
Maximum Minimum
20 0.5 0.5
50 6 2
100 30 10

Table 3. Numerical simulation results

View table

Table 3. Numerical simulation results

Arrayarrangement	Beam position	Beamquality β	Centroiddrift in ydirection /mm	Centroiddrift in zdirection /mm	Change ofbeamquality Δβ	Change ofcentroid driftin y direction /mm	Change ofcentroid driftin z direction /mm
	Left	3.33	0.417	0.571	-0.415	0.417	-0.139
Horizontal	Middle	3.38	0	0.703	-0.362	0	-0.007
	Right	3.33	0.418	0.571	-0.415	0.418	-0.139
	Upper	2.58	0	0.436	-1.160	0	-0.273
Vertical	Middle	2.88	0	0.538	-0.865	0	-0.172
	Lower	3.73	0	0.711	-0.008	0	0.002
	Left	3.68	0.348	0.635	-0.064	0.348	-0.074
Positivetriangular	Middle	2.58	0	0.555	-1.160	0	-0.155
	Right	3.68	0.348	0.634	-0.064	0.348	-0.075
	Left	3.49	0.320	0.645	-0.248	0.320	-0.065
Invertedtriangular	Middle	3.67	0	0.706	-0.070	0	-0.003
	Right	3.50	0.320	0.645	-0.246	0.320	-0.064
	Left	3.68	0.445	0.577	-0.066	0.445	-0.132
Slanting	Middle	3.33	0.101	0.712	-0.415	0.101	0.002
	Right	3.62	0.479	0.583	-0.122	0.479	-0.126

Tools

Get Citation

Copy Citation Text

Wansheng Liu, Zhijun Yuan, Hanbin Wang, Yuqiao Xian, Mengqi Su, Bing He, Jun Zhou. Thermal Blooming Effect of Array Beams Under Buoyancy Convection in Closed Channel[J]. Acta Optica Sinica, 2022, 42(1): 0114001

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites