Thin-Disk Nd∶YAG Vortex Laser

Fig. 1. Experimental setup for passively Q-switched vortex laser.(a) Experimental setup; (b) ring radii of LG modes; (c) tilt angle measurement of output mirror

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Fig. 2. Output spot and interferogram of $L G_{0, \pm 1}$ modes under low power pump. (a)(f) $e x p (- i 0.8 π) L G_{0, + 1} + L G_{0, - 1}$ ; (b)(g) $e x p (i 0.7 π) L G_{0, + 1} + L G_{0, - 1}$ ; (c)(h) $e x p (- i 0.85 π) L G_{0, + 1} + 0.5 L G_{0, - 1}$ ; (d)(i) $e x p (- i 0.8 π) L G_{0, + 1} + 0.2 L G_{0, - 1}$ ; (e)(j) $L G_{0, + 1}$

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Fig. 3. Calculated coherent superposition spots of $L G_{0, \pm 1}$ modes. (a) $e x p (- i 0.8 π) L G_{0, + 1} + L G_{0, - 1}$ ; (b) $e x p (i 0.7 π) L G_{0, + 1} + L G_{0, - 1}$ ; (c) $e x p (- i 0.85 π) L G_{0, + 1} + 0.5 L G_{0, - 1}$ ; (d) $e x p (- i 0.8 π) L G_{0, + 1} + 0.2 L G_{0, - 1}$

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Fig. 4. Coherent superposition spots of $L G_{0, \pm 2}$ modes and $L G_{0, \pm 3}$ modes under different tilt angles of output mirror. (a)(b) Within 0.03°; (c) $(0.04 °, 0.03 °)$ ; (d) $(0.06 °, 0.03 °)$ ; (e) $(0.02 °, 0.02 °)$ ; (f) $(0.05 °, 0.02 °)$ ; (g) $(0.07 °, 0.02 °)$

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Fig. 5. Coherent superposition spots of $L G_{0, \pm 4}$ modes, $L G_{0, \pm 5}$ modes, $L G_{0, \pm 6}$ modes, $L G_{0, \pm 7}$ modes and $L G_{0, \pm 8}$ modes. (a) $L G_{0, \pm 4}$ modes; (b) $L G_{0, \pm 5}$ modes; (c) $L G_{0, \pm 6}$ modes; (d) $L G_{0, \pm 7}$ modes; (e) $L G_{0, \pm 8}$ modes

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Fig. 6. Output spots and interferograms under high pump power. (a)(e)(i) Output spot; (b) interferogram with tilt angle within 0.02°; (c) interferogram with tilt angle of （0.05°，0.03°）; (d) interferogram with tilt angle of （-0.05°，0.03°）; (f) interferogram with tilt angle within 0.03°; (g) interferogram with tilt angle of （0.06°，0.03°）; (h) interferogram with tilt angle of （-0.06°，0.03°）; (j) interferogram with tilt angle within 0.03°; (k) interferogram with tilt angle of （0.07°，0.02°）; (l) interferogram with tilt angle of （-0.07°，0.02°）

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Fig. 7. Power characteristic of $L G_{0, \pm 1}$ modes, $L G_{0, \pm 2}$ modes and $L G_{0, \pm 3}$ modes

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Fig. 8. Polarization characteristics of different modes. (a) $L G_{0, \pm 1}$ modes; (b) $L G_{0, \pm 2}$ modes; (c) $L G_{0, \pm 3}$ modes

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Fig. 9. Spots under different phase differences. (a) -0.8π; (b) 0.7π; (c) 0.1π; (d) 0.3π

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Fig. 10. Spots and interferograms under high pump power. (a) Spot; (b) interferogram of mixed mode; (c) interferogram of $L G_{0, - 1}$ mode; (d) interferogram of $L G_{0, + 1}$ mode

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Fig. 11. Temporal waveforms of pulses. (a) Single pulse; (b) pulse train

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Tianhong Lian, Lei Yang, Jiahua Zhu, Jianning Liu, Junhong Xing, Yun Liu, Mingxing Jiao. Thin-Disk Nd∶YAG Vortex Laser[J]. Acta Optica Sinica, 2022, 42(21): 2114002

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Paper Information

Category: Lasers and Laser Optics

Received: Apr. 11, 2022

Accepted: May. 16, 2022

Published Online: Nov. 4, 2022

The Author Email: Lian Tianhong (tianhongl@126.com)

DOI:10.3788/AOS202242.2114002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology