60 mJ Q-switched Ho:YLF laser end-pumped by QCW thulium fiber laser

Tooski, Majid Babaiy; Maleki, Abbas; Majd, Abdolah Eslami; Ebadian, Hassan

doi:10.1007/s00340-022-07862-3

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…The cryogenic temperature was used to overcome the thermal limitation [12,13]. Ho:YLF laser crystal at room temperature is a quasithree-level laser; thus, gain/absorption saturation occurs [14]. The leading cause of the above events is the intensity of the pump beam.…”

Section: Introductionmentioning

confidence: 99%

“…The focal length of the induced thermal lens can be calculated using the ABCD matrix approach of an optical resonator [19]. By measuring the output beam radius near the output coupler, the focal length of the induced thermal lens can be estimated [14]. Achieving the maximum output power with a small divergence angle in the end-pumped geometry requires using an optimal optical resonator.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of thermal effect on the output characteristics of end-pumped Ho:YLF laser in concave–concave and concave–convex resonators

Tooski¹,

Maleki²,

Ebadian³

et al. 2023

Laser Phys.

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The thermal effect on the output characteristics was analyzed in an end-pumped Ho:YLF laser by applying the Kirchhoff integral analytic solution and finite element analysis using LASCAD software. At a Tm:fiber laser power of 70 W, the maximum temperature of a Ho:YLF crystal with 8 mm diameter was found to be 297.6 K. The temperature distribution results of the two calculation methods were matched with an acceptable error. The calculated thermal lens focal length for the maximum power was −985 and −976 mm in the 3 and 8 mm diameter rods, respectively. The simulation results showed that for the larger diameter crystal, the thermal lens effect is less. Moreover, in this study, the calculation results were validated as experimental results. A focal length of the thermal lens of −1012.6 ± 101.26 mm at double-pass pumping was measured. The experimental study showed that laser characteristics such as the far-field divergence angle were improved in the concave–convex resonator with 0.5% Ho:YLF crystal. The experimentally measured divergence angle was 0.7 mrad, which confirms the simulation results. The output power was 13.5 W, corresponding to 19.3% optical-to-optical efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%