Pulse Characteristics of Quasi Continuous-Wave Pumped Yb∶KYW/Cr<sup>4+</sup>∶YAG Q-Switched Laser

Nihui Zhang; Mingjie Yao; Wenqi Ge; Hongbo Zhang

doi:10.3788/LOP220459

Laser & Optoelectronics Progress, Volume. 60, Issue 7, 0714003(2023)

Pulse Characteristics of Quasi Continuous-Wave Pumped Yb∶KYW/Cr⁴⁺∶YAG Q-Switched Laser

Nihui Zhang^1,2, Mingjie Yao^1,2, Wenqi Ge^1,2, and Hongbo Zhang^1,2、*

Author Affiliations

¹Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

²Academy of Opto-Electronics, University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(12)

Fig. 1. Yb∶KYW energy level split diagram and energy level transition diagram of quasi-four-level system

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Fig. 2. Cavity's design diagram of Yb∶KYW passively Q-switched laser

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Fig. 3. Diagram of Q-switched pulse delay

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Fig. 4. Influence of pump source on pulse delay

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Fig. 5. Variations of pulse delay with (a) pump power (t_p = 100,200,300 μs) and (b) pump pulse width (P = 15,20,25 W)

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Fig. 6. Variation of (a) pulse delay and (b) pulse width with pump power

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Fig. 7. Pulse build (a) waveform graph and (b) pulse width graph ( $P = 12.7 W$ , $t_{p} = 200, 190, 170 μ s$ )

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Fig. 8. (a) Energy stability within 30 min and (b) pulse establishment of Q-switched Yb∶KYW laser ( $P = 15.6 W$ )

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Fig. 9. Influence of pump source on pulse number

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Fig. 10. Change of pulse number with pump power when

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Fig. 11. (a) Comparison diagram of pulse delay experiment and simulation and (b) pulse waveform diagram (P = 15.6 W) of sub pulse

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Table 1. Value of related parameters
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Table 1. Value of related parameters
Parameter Value Parameter Value
$σ / m^{2}$ 3.0×10^-24 $τ / μ s$ 300
$σ_{s g} / m^{2}$ 0.3×10^-24 $t_{s} / μ s$ 3.5
$σ_{g s} / m^{2}$ 8.7×10^-23 $γ$ 1
$σ_{e s} / m^{2}$ 2.2×10^-23 $δ$ 0.2
$n_{g}$ 2 $l / m m$ 10
$n_{s}$ 1.8 $l_{s} / m m$ 0.5
$L / m m$ 35 $c / (m \cdot s^{- 1})$ 3×10⁸
$f_{1}$ 0.0840 $f_{2}$ 0.7524

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Nihui Zhang, Mingjie Yao, Wenqi Ge, Hongbo Zhang. Pulse Characteristics of Quasi Continuous-Wave Pumped Yb∶KYW/Cr⁴⁺∶YAG Q-Switched Laser[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0714003

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