Influence of the misalignment of the collimating lens on the line-width of Littman-Metcalf grating external cavity laser

Ping Zhou; Yongqian Wu; Rongzhu Zhang

doi:10.3788/IRLA20210168

Journals >Infrared and Laser Engineering >Volume 51 >Issue 4 >Page 20210168 > Article

Infrared and Laser Engineering
Vol. 51, Issue 4, 20210168 (2022)

Influence of the misalignment of the collimating lens on the line-width of Littman-Metcalf grating external cavity laser

Ping Zhou^1、2, Yongqian Wu², and Rongzhu Zhang¹

Author Affiliations

¹College of Electronic Information, Sichuan University, Chengdu 610065, China

²Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China

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DOI: 10.3788/IRLA20210168 Cite this Article

Ping Zhou, Yongqian Wu, Rongzhu Zhang. Influence of the misalignment of the collimating lens on the line-width of Littman-Metcalf grating external cavity laser[J]. Infrared and Laser Engineering, 2022, 51(4): 20210168 Copy Citation Text

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Fig. 1. Structure diagram of Littman-Metcalf configuration of ECDL

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Fig. 2. Schematic diagram of external cavity laser mode selection

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$Relationship between the output linewidth of the laser and length of the external cavity while (a) the reflectivity of laser diode, (b) the diffraction efficiency of blazed grating and (c) the reflectivity of reflecting prism are different$

Fig. 3. Relationship between the output linewidth of the laser and length of the external cavity while (a) the reflectivity of laser diode, (b) the diffraction efficiency of blazed grating and (c) the reflectivity of reflecting prism are different

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Fig. 4. Influence of coupling efficiency on the output linewidth of the laser

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Fig. 5. Schematic diagram of lens tilting (a) and decentering (b) along X-axis

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Fig. 6. Influence of lens tilted about （a） X-axis, （b） Y-axis on coupling efficiency

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Fig. 7. Effects of lens tilted on output linewidth

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Fig. 8. Influence of lens decentered about （a） XandY-axis, （b） Z-axis on coupling efficiency

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Fig. 9. Influence of lens decentered about （a） X and Y-axis, （b） Z-axis on output linewidth

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	0	0.035	0.07	0.105	0.14
${\eta _x}$	1	0.392	0.108	0.049	0.024
${\eta _y}$	1	0.968	0.701	0.404	0.243
$\eta $	1	0.379	0.076	0.02	0.006
$\Delta \nu /{10^3}$	2.88	3.19	4.64	112	281

Table 1. Relationship between output linewidth and tilt amount of X-axis

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	0	0.035	0.07	0.105	0.14
${\eta _x}$	1	0.998	0.976	0.897	0.754
${\eta _y}$	1	0.891	0.446	0.243	0.126
$\eta $	1	0.889	0.456	0.196	0.095
$\Delta \nu /{10^3}$	2.88	2.91	3.14	3.37	5.69

Table 2. Relationship between output linewidth and tilt amount of Y-axis

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	0	0.35	0.7	1.05	1.5
$\eta \_x$	1	0.192	0.051	0.0236	0.014
$\eta \_y$	1	0.167	0.030	0.009	0.005
$\Delta {\nu _X}/{10^3}$	2.88	3.58	5.39	7.78	15.9
$\Delta {\nu _Y}/{10^3}$	2.88	3.68	7.41	521	1031

Table 3. Relationship between output linewidth and decenter amount of Xand Y-axis

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	5.5	5.535	5.57	5.605	5.64
${\eta _x}$	1	0.122	0.053	0.035	0.026
${\eta _y}$	1	0.745	0.435	0.307	0.235
$\eta $	1	0.091	0.023	0.011	0.007
$\Delta \nu /{10^3}$	2.88	4.35	9.41	29.2	564

Table 4. Relationship between output linewidth and LD lens location

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	${T_X}$/rad	${T_Y}$/rad	${D_X}$/mm	${D_Y}$/mm	${D_Z}$/mm
Assembly tolerance	0.0483	0.0881	0.3487	0.3046	0.0165

Table 5. Collimating lens installation tolerance of Littman-Metcalf external cavity

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