A generalized model for passively Q-switched lasers including excited state absorption in the saturable absorber

Xiao, Guohua; Bass, Michael

doi:10.1109/3.554875

Cited by 180 publications

(9 citation statements)

References 16 publications

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“…The models used so far have also been extended to describe ESA. 15 They assume an instantaneous relaxation of the electrons in the higher excited state (4) back to the first excited state (2). Therefore, it is referred to as static ESA in the following.…”

Section: Theoretical Modelmentioning

confidence: 99%

Passively Q-switched sub-100 ps Yb3+:YAG/Cr4+:YAG microchip laser: experimental results and numerical analysis

Giese

Körber

Kostourou³

et al. 2023

Solid State Lasers XXXII: Technology and Devices

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We demonstrate sub-100 ps pulses with a Yb 3+ :YAG microchip laser passively Q-switched by a Cr 4+ :YAG saturable absorber. By introducing a subcavity, the laser threshold and the saturation energy are decreased which helps to prevent damage and to vary the effective emission and absorption cross sections. Pulse widths of 84 ps, repetition rates of 3.3 kHz and pulse energies of 32 µJ are achieved. This allows direct micromaterial processing e.g. for ophthalmic surgeries. To the best of our knowledge, this is the first sub-100 ps Yb 3+ :YAG/Cr 4+ :YAG microchip laser. A new approximation is used to calculate the rate equations for multiple longitudinal modes and to determine the threshold for single-longitudinal-mode operation.

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Section: Theoretical Modelmentioning

confidence: 99%

Passively Q-switched sub-100 ps Yb3+:YAG/Cr4+:YAG microchip laser: experimental results and numerical analysis

Giese

Körber

Kostourou³

et al. 2023

Solid State Lasers XXXII: Technology and Devices

View full text Add to dashboard Cite

show abstract

“…Another important parameter is the ratio A=A s between the effective area in the gain medium and that in the saturable absorber, which affects the peak energy through α in rate equations with the SA. 21,30) In this calculation, the ratio has been obtained from the expression (ω 1 =ω SA ) 2 . The dependence on distance at different pump powers is shown in Fig.…”

Section: (D)mentioning

confidence: 99%

Thermal lens effect for optimizing a passively Q-switched 1064 nm laser

Xing

Rong

Khew

et al. 2018

Appl. Phys. Express

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We demonstrate the improvement of pulse characteristics of a passively Q-switched laser by utilizing the thermal lens effect of a saturable absorber (SA) inside the cavity. The experimental results show that the SA should be considered as a convex lens inside the cavity, whose position strongly improves output performance. A fourfold enhancement of the average output power is obtained, and the peak energy increases from 8.2 to 25 µJ. Theoretically, we calculate the thermal lens effect of the SA and the optimal position inside the cavity, which agree with the experimental results.

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“…For good passive Q-switching, the saturation in the absorber must occur before the gain saturation in the laser crystal (the second threshold condition) [27]. From the analysis of the coupled rate equations, the criterion for good passive Q-switching is given by [30]:…”

Section: Generating Passively Q-switched Hg Mn Modesmentioning

confidence: 99%

Generating high-peak-power structured lights in selectively pumped passivelyQ-switched lasers with astigmatic mode transformations

et al. 2017

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Various high-order Hermite-Gaussian (HG) modes with high repetition rates and high peak powers are systematically generated by designing the cavity configuration to satisfy the criterion of the passive Q-switching. For the HG m,0 modes with the order m = 1-9, the pulse repetition rate can exceed 100 kHz with peak power higher than 0.3 kW. For the HG m,m modes with the order m = 1-10, the pulse repetition rate can be up to 37 kHz with peak power higher than 0.35 kW. Furthermore, the high-order HG beams is transformed by using an astigmatic mode converter to generate various structured lights with optical vortices. Experimental patterns of the transformed high-order HG beams in the propagation are theoretically analyzed and the phase structures are numerically manifested.

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A generalized model for passively Q-switched lasers including excited state absorption in the saturable absorber

Cited by 180 publications

References 16 publications

Passively Q-switched sub-100 ps Yb3+:YAG/Cr4+:YAG microchip laser: experimental results and numerical analysis

Passively Q-switched sub-100 ps Yb3+:YAG/Cr4+:YAG microchip laser: experimental results and numerical analysis

Thermal lens effect for optimizing a passively Q-switched 1064 nm laser

Generating high-peak-power structured lights in selectively pumped passivelyQ-switched lasers with astigmatic mode transformations

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