Comparative Analysis of Laser Focusing Modes Applicable to Water Jet Guided Laser

En Liang; Yuxing Huang; Hui Jiao; Guanghui Zhang; Liao Zhou; Ping Huang; Chaozheng Chang; Yuhong Long

doi:10.3788/LOP202158.1722002

Journals >Laser & Optoelectronics Progress >Volume 58 >Issue 17 >Page 1722002 > Article

Laser & Optoelectronics Progress
Vol. 58, Issue 17, 1722002 (2021)

Comparative Analysis of Laser Focusing Modes Applicable to Water Jet Guided Laser

En Liang, Yuxing Huang, Hui Jiao, Guanghui Zhang, Liao Zhou, Ping Huang, Chaozheng Chang, and Yuhong Long^*

Author Affiliations

Sichool of Electrcal and Mechanical Engineering, Guilin University of Electronic Technology, Guilin , Guangxi 541004, China

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DOI: 10.3788/LOP202158.1722002 Cite this Article Set citation alerts

En Liang, Yuxing Huang, Hui Jiao, Guanghui Zhang, Liao Zhou, Ping Huang, Chaozheng Chang, Yuhong Long. Comparative Analysis of Laser Focusing Modes Applicable to Water Jet Guided Laser[J]. Laser & Optoelectronics Progress, 2021, 58(17): 1722002 Copy Citation Text

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Fig. 1. Processing principle and characteristic analysis diagram of water-guided laser.（a）Processing principle；（b）beam propagation

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Fig. 2. Paths of parallel beams of light through different focusing lenses.（a）CFM；（b）GBFM；（c）PNAFM

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Fig. 3. Physical optical propagation and spot diagram of X cross section in three modes.（a）CFM；（b）GBFM；（c）PNAFM

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Fig. 4. Optical simulation of two-dimensional diagram in three modes.（a）CFM；（b）GBFM；（c）PNAFM

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$Results of X-section characteristics of non-diffracted beam varying with propagation distance.（a）Light intensity map；（b）spot diagram$

Fig. 5. Results of X-section characteristics of non-diffracted beam varying with propagation distance.（a）Light intensity map；（b）spot diagram

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Focusing model	ABCD transmission matrix	Ray angle
CFM	$M_{1} = [\begin{matrix} A_{1} & B_{1} \\ C_{1} & D_{1} \end{matrix}] = M_{F} M_{E} = [\begin{matrix} A & B \\ - A / f + C & - B / f + D \end{matrix}]$	$θ_{l a s e r} \approx a r c t a n (R / f)$
GBFM	$M_{2} = [\begin{matrix} A_{2} & B_{2} \\ C_{2} & D_{2} \end{matrix}] = M_{G B} M_{E} = [\begin{matrix} A E + C F & B E + D F \\ A G + C H & B G + D H \end{matrix}]$	$θ_{l a s e r} \approx a r c t a n [R / (l + D + t)]$
PNAFM	$M_{3} = [\begin{matrix} A_{3} & B_{3} \\ C_{3} & D_{3} \end{matrix}] = M_{C} M_{E} = [\begin{matrix} A U + C V & B U + D V \\ A X + C Y & B X + D Y \end{matrix}]$	$θ_{l a s e r} \approx (n_{4} - 1) γ$

Table 1. Transmission matrix and focusing ray angle in different focusing modes

Type	PEL	PXL	BXL	GL	BL	PAL	NAL
Semidiameter /mm	12.70	12.70	12.70	12.70	6.35	12.70	12.70
Material	N-BK7	F_SILICA	N-BK7	SLS-1.0	N-BK7	F_SILICA	N-BK7
Focal length /mm	-50	175	100	10
Cone angle /（°）						10	5
Radius /mm	-25.75	80.20	102.40	Infinity	6.35	Infinity	-1×10^-5
Conic	0	0	0	0	0	33.163	-131.646
Center thickness /mm	3.5	4.0	3.6			8.0	3.0
Edge thickness /mm	6.9	3.0	2.0			3.0	6.9

Table 2. Lens parameters

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