Pulsed-periodic Ho:YLF lasers: optimization problems

Serebryakov, V. A.; Khramov, V. Yu.; Narivonchik, A. S.; Kalintseva, N. A.; Kornev, A. F.; Pavlova, A. L.; Skvortsov, D. V.

doi:10.1364/jot.83.000722

Cited by 5 publications

(6 citation statements)

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“…A common approach to pumping the holmium crystal is to use Tm:fiber laser because stock loss is low [20]. In Ho:YLF laser, the laser threshold is decreased, and its efficiency increased when the pump beam has π polarization [17].…”

Section: Calculation and Experimental Verification Of The Pump Absorp...mentioning

confidence: 99%

“…On the other hand, the size of the beam in the crystal affects the amount of absorbed power and the absorption efficiency. The absorbed pump power in the Due to the quasi-three-level nature of the Ho:YLF crystal, at high-intensity pump levels, two processes will occur: up-conversion (UC) and depletion [20]. The high-level UC rate of the laser in the Ho:YLF crystal depends on the holmium ion concentration [13,26].…”

Section: The Absorption Efficiency (η Absmentioning

confidence: 99%

“…By using crystals with low Ho concentration, the amount of UC can be reduced. Bleaching in the laser transition is another process that occurs here (compensation of reabsorption loss) [20]. By optimizing the crystal length and minimizing the reabsorption, the lasing threshold is reduced.…”

Section: The Absorption Efficiency (η Absmentioning

confidence: 99%

“…By optimizing the crystal length and minimizing the reabsorption, the lasing threshold is reduced. The pump power at absorption threshold is obtained from equation ( 6) [20,27];…”

Section: The Absorption Efficiency (η Absmentioning

confidence: 99%

“…where υ p is the pumping frequency, and A is the cross-section area of the pump beam [20]. The amount N 0 , l m and low transmittances of output mirror the effect on the absorption threshold.…”

Section: The Absorption Efficiency (η Absmentioning

confidence: 99%

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

et al. 2021

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In this paper, a Tm:fiber laser pumped Ho:YLF laser is simulated. The absorption efficiency, optimum crystal length, and optical resonator are analytically studied and simulated using LASCAD software, and the atomic-level degeneracies are considered in evaluating the absorption efficiency. In this way, the absorption efficiencies of 65% and 87% are obtained for single-pass 30 mm Ho:YLF crystal with doping concentration 0.5% and 1% respectively. These calculated efficiencies are verified by our experimental measurements and they coincide with acceptable errors. To estimate a proper length for the Ho:YLF crystal with specified doping concentration, the up-conversion, and the reabsorption effects are considered. As a result, we find the 30 mm length crystal is suited for reducing the absorption threshold and prohibiting reabsorption while saturation is controlled. The threshold power and slope efficiency for 65 W pumped powers are calculated by LASCAD software, and the thermal lens focal length of −665 mm is obtained. For a nearly constant beam width inside the cavity and suitable beam overlap efficiency, a concave-concave configuration is chosen for the optical resonator. In the continuous-wave operation, the output power is funded to be 38.4 W and the slope efficiency would be 66%.

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Section: Calculation and Experimental Verification Of The Pump Absorp...mentioning

confidence: 99%

Section: The Absorption Efficiency (η Absmentioning

confidence: 99%

Section: The Absorption Efficiency (η Absmentioning

confidence: 99%

“…By optimizing the crystal length and minimizing the reabsorption, the lasing threshold is reduced. The pump power at absorption threshold is obtained from equation ( 6) [20,27];…”

Section: The Absorption Efficiency (η Absmentioning

confidence: 99%

Section: The Absorption Efficiency (η Absmentioning

confidence: 99%

See 3 more Smart Citations