Effect of Facet Reflection on Beam Quality of Tapered Laser

Daoming You; Manqin Tan; Wenbin Chen; Weihua Liu

doi:10.3788/CJL220661

Chinese Journal of Lasers, Volume. 50, Issue 2, 0201007(2023)

Effect of Facet Reflection on Beam Quality of Tapered Laser

Daoming You^1,2, Manqin Tan^1,2、*, Wenbin Chen^1,2, and Weihua Liu^1,2

¹State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors,Chinese Academy of Sciences, Beijing 100083, China

²College of Materials Science and Opto-Electronic Technology, University ofChinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(12)

Fig. 1. Typical structure of tapered lasers. (a) 3D diagram; (b) plane diagram

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Fig. 2. Physical model of tapered lasers

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Fig. 3. Field distribution along transmission direction in cavity of traditional tapered lasers

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Fig. 4. Field distributions in cavity when $R_{f}$ is 0.01%-5.00%. (a) Front facet; (b) junction; (c) rear facet

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Fig. 5. Filed distributions in cavity when $R_{r}$ is 1%-95%. (a) Junction; (b) rear facet

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Fig. 6. Filed distributions of front facet with different $R_{f}$ . (a) $R_{f} = 5 %$ ; (b) $R_{f} = 0.01 %$

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Fig. 7. Filed distributions obtained by optimized path 1 ( $R_{f} = 0.01 %$ ). (a) $R_{r} = 90 %$ ; (b) $R_{r} = 10 %$

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Fig. 8. Filed distributions obtained by optimized path 2 ( $R_{f} = 0.1 %$ ). (a) $R_{r} = 10 %$ ; (b) $R_{r} = 1 %$

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Fig. 9. Simulation results for optimally designed tapered lasers . (a) PIV curves; (b) $M^{2}$ -current curves

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Table 1. Effect of $R_{f}$ on beam quality

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Table 1. Effect of $R_{f}$ on beam quality

$R_{f}$ /%	$R_{r}$ /%	Side lobe peak /%	Beam quality	Main feature of nonlinear effect
32	95	18.5	Poor	Optical pumping，filamentation，and SHB
20	95	18.2	Poor	Optical pumping，filamentation，and SHB
15	95	17.0	Poor	Optical pumping，filamentation，and SHB
10	95	9.8	Poor	Optical pumping and weak filamentation

Table 2. Effect of $R_{r}$ on beam quality

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Table 2. Effect of $R_{r}$ on beam quality

$R_{f}$ /%	$R_{r}$ /%	Side lobe peak /%	Beam quality	Main feature of nonlinear effect
5	99	22.4	Poor	Optical pumping，filamentation，and SHB
5	90	15.0	Poor	Optical pumping，filamentation，and SHB
5	50	14.6	Poor	Optical pumping，weak filamentation，and SHB
5	32	12.7	Poor	Optical pumping

Table 3. Beam quality after optimized design

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Table 3. Beam quality after optimized design

$R_{f}$ /%	$R_{r}$ /%	Beam quality	Main feature
0.01	50.0	<3.0	Weak optical pumping and filamentation
0.01	32.0	<2.6	Weak optical pumping
0.01	1.0	<1.8	Almost no nonlinear effect
0.10	32.0	<3.2	Optical pumping and filamentation
0.10	0.1	<1.8	Almost no nonlinear effect

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Daoming You, Manqin Tan, Wenbin Chen, Weihua Liu. Effect of Facet Reflection on Beam Quality of Tapered Laser[J]. Chinese Journal of Lasers, 2023, 50(2): 0201007

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