Watt-level diode-pumped thulium lasers around 2.3  µm

Kifle, Esrom; Loiko, Pavel; Guillemot, Lauren; Starecki, Florent; Braud, Alain; Georges, T.; Rouvillain, Julien; Camy, Patrice

doi:10.1364/ao.400632

Cited by 36 publications

(4 citation statements)

References 45 publications

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“…Finally, we achieve ηh ≈ 22.5%. This value reasonably agrees with the previously reported results for a Tm:YAG laser operating on the 3 H4 → 3 H5 transition, ηh = 30-35% well above the laser threshold [29]. The uncertainty in the estimation of the fractional heat loading is the main source of error in evaluating the thermal lens of the laser crystal.…”

Section: Thermal Lensing Of the Saturable Absorbersupporting

confidence: 91%

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Design and modeling of a passively Q-switched diode-pumped Thulium laser at 2.3 μm

Kifle

Loiko

Guillemot

et al. 2021

Optics Communications

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We report on a diode-pumped Tm:LiYF4 laser operating on the 3 H4 → 3 H5 transition (at ~2.3 μm) passively Q-switched by a Cr 2+ :ZnSe saturable absorber. This laser delivers a maximum average output power of 130 mW at 2304.6 nm with a nearly diffraction limited beam, a linear polarization (π) and no colasing at ~1.9 μm. The corresponding pulse characteristics (duration / energy) are 1.24 μs / 3.6 μJ at a repetition rate of 36 kHz. By power scaling under quasi-CW pumping, even shorter pulse durations of 870 ns and higher pulse energies of 6.1 μJ are achieved. The performance of the laser is simulated using a model of a quasi-four-level gain medium and a "slow" saturable absorber showing a good agreement with the experiment. The effect of the thermal lens of the saturable absorber on the pulse characteristics is discussed.

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Section: Thermal Lensing Of the Saturable Absorbersupporting

confidence: 91%

“…The measured beam quality factors M 2 x,y were below 1.4. The spatial characteristics of the laser beam and their evaluation were similar to those described in the previous work [29].…”

Section: Passively Q-switched Laser: Power Scalingsupporting

confidence: 54%

Design and modeling of a passively Q-switched diode-pumped Thulium laser at 2.3 μm

Kifle

Loiko

Guillemot

et al. 2021

Optics Communications

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“…In the early 1970s, 2.3 μm laser emission based on the prediction of the Judd-Ofelt theory was realized in Tm-doped oxide host materials [9] . By now, lasers at 2.3 μm based on the Tm 3 3 H 4 → 3 H 5 transition have been reported and analyzed theoretically in various host crystals, e.g., Tm:YAG [9,10] , Tm:YAP [9,[11][12][13][14] , Tm:YLF [13,[15][16][17][18] , Tm: KYF [19][20][21] , Tm:LuAG [22] , and Tm:KluWO 4 [23] . These lasers based on the Tm 3 3 H 4 → 3 H 5 transition in different host crystals can generate laser emissions with different wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Continuous-wave three-wavelength operation of a diode-pumped Tm:YVO4 laser on the 3H4→3H5 and 3F4→3H6 transitions

et al. 2023

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A diode-pumped continuous-wave Tm:YVO 4 laser operating on the 3 H 4 → 3 H 5 and 3 F 4 → 3 H 6 transitions was demonstrated for the first time, to the best of our knowledge. An a-cut Tm:YVO 4 crystal with 1.5% (atomic fraction) Tm 3 ion concentration was used to characterize the laser behavior. A common commercial laser diode with a central wavelength of 790 nm and a bandwidth of 3.2 nm was utilized as a pump source. With an output coupler for the 3 H 4 → 3 H 5 and 3 F 4 → 3 H 6 transitions, simultaneous three-wavelength laser operation was achieved. The laser emissions at 2292 and 2363 nm in π-polarization and at 2108 nm in σ-polarization were realized. With an incident pump power of 22 W, the total output power of 1.17 W at 2292, 2363, and 2108 nm was obtained. The output power at 2292 and 2363 nm was measured to be 750 mW, and the output power at 2108 nm was measured to be 420 mW.

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“…At this time, the phonon acts as a crucial unit for tailoring electronic transitions and corresponding fluorescence emission with homogeneous spectral broadening. Therefore, some broadband laser wavelengths can be designed by the selective amplification of phonon-assisted emission [12][13][14] , which is more convenient than traditional nonlinear optical technology suffering from complex configuration and high cost. In the past 40 years, some broadband vibronic lasers with great spectral broadening were discovered, including Ti:Sapphire 15 , alexandrite 16 , Cr:LiSAF 17 , Tm:CALYO 18 , Yb:YAG 19 , and so on.…”

Section: Introductionmentioning

confidence: 99%

Phonon engineering in Yb:La2CaB10O19 crystal for extended lasing beyond the fluorescence spectrum

Cheng,

Liang,

et al. 2023

Light Sci Appl

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Since the first invention of the laser in 1960, direct lasing outside the fluorescence spectrum is deemed impossible owing to the “zero-gain” cross-section. However, when electron-phonon coupling meets laser oscillation, an energy modulation by the quantized phonon can tailor the electronic transitions, thus directly creating some unprecedented lasers with extended wavelengths by phonon engineering. Here, we demonstrate a broadband lasing (1000–1280 nm) in a Yb-doped La2CaB10O19 (Yb:LCB) crystal, far beyond its spontaneous fluorescence spectrum. Numerical calculations and in situ Raman verify that such a substantial laser emission is devoted to the multiphonon coupling to lattice vibrations of a dangling “quasi-free-oxygen” site, with the increasing phonon numbers step-by-step (n = 1–6). This new structural motif provides more alternative candidates with strong-coupling laser materials. Moreover, the quantitative relations between phonon density distribution and laser wavelength extension are discussed. These results give rise to the search for on-demand lasers in the darkness and pave a reliable guideline to study those intriguing electron-phonon-photon coupled systems for integrated photonic applications.

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Watt-level diode-pumped thulium lasers around 2.3 µm

Abstract: We report on efficient diode-pumped mid-infrared lasers based on T m : L i Y F 4 , T m : Y 3 A l 5 O 12 , and T m : Y A l O 3 crystals. These lasers operate in the… Show more

Cited by 36 publications

References 45 publications

Design and modeling of a passively Q-switched diode-pumped Thulium laser at 2.3 μm

Design and modeling of a passively Q-switched diode-pumped Thulium laser at 2.3 μm

Continuous-wave three-wavelength operation of a diode-pumped Tm:YVO4 laser on the 3H4→3H5 and 3F4→3H6 transitions

Phonon engineering in Yb:La2CaB10O19 crystal for extended lasing beyond the fluorescence spectrum

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