Absorption efficiency analysis and optical resonator simulation of Ho:YLF laser pumped with Tm:fiber laser

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

doi:10.1088/1555-6611/ac3b46

Cited by 3 publications

(2 citation statements)

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“…To calculate the absorbed pump power during the lasing process, the residual pump power was measured after the M 2 mirror at the L-shape resonator (or the M 3 mirror at the U-shape resonator). Because of bleaching and absorption saturation at higher pump powers, a reduction in the absorption efficiency happens [9].…”

Section: Continuous-wave Operationmentioning

confidence: 99%

“…A high gain cross-section, long storage time, athermal, and birefringent properties with polarized light are advantages of this crystal [4]. In some research, using an end-pumped structure and suitable optical resonator of Ho:YLF laser, high output energy could be achieved with optimum beam quality [9,10]. In the end-pumped structure, mode matching is critical.…”

Section: Introductionmentioning

confidence: 99%

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Continuous-wave and pulsed operation of Ho:YLF laser end-pumped by Tm:fiber laser

Tooski¹,

Maleki²,

Majd³

et al. 2022

Laser Phys.

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Continuous-wave and pulsed operation of a Ho:YLF laser was demonstrated. A Tm:fiber laser with 70 W output power was used for the pump source. In this experimental setup, the end-pumped gain medium with 0.5% and 1% Ho concentration in the optical resonators were used. In the continuous-wave regime, 14.2 and 12.8 W linearly polarized power with a concave-concave resonator for 1.0% and 0.5% Ho dopes were extracted, respectively. These amounts correspond to slope efficiencies of 51.9% and 71.3% and optical-to-optical efficiencies of 39.4% and 54.7% for absorbed pump power, respectively. To avoid optical damage, a U-shaped concave-concave resonator was installed, and the resulting spot size in the resonator was about 1.31 mm. The spot size changes about 10% along the total physical length of the resonator. In the pulsed operation regime, for 0.5% Ho concentration with 20 ms pump pulse duration and 10 Hz repetition rates, the free-running output energy was 172 mJ with 16 ms pulse duration. In addition, the absorbed pump energy was about 485 mJ, corresponding to the slope and the optical-to-optical efficiencies of 14.8% and 12.3%, respectively. Also, 27 mJ pulse energy with 29.7 ns duration was achieved for Q-switched operation. Finally, the angle of output beam divergence was measured at approximately 1.1 mrad, and the laser emission wavelength was 2.0568 µm with 0.0065 µm line width.

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Section: Continuous-wave Operationmentioning

confidence: 99%