Tm:YLF slab wavelength-selected laser

Strauss, H. J.; Esser, M. J. Daniel; King, Gary; Maweza, L.

doi:10.1364/ome.2.001165

Cited by 19 publications

(11 citation statements)

References 10 publications

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“…The experimental setup is shown in Figure 2. The 1.885 µm pump laser (components 1-8 in Figure 3) was a modified version of the Tm:YLF slab laser described in [4]. It's beam quality was improved by adding intra-cavity lenses and decreasing the number of modes in the cavity.…”

Section: Methodsmentioning

confidence: 99%

Transverse intensity transformation by laser amplifiers

Litvin¹,

King²,

Collett³

et al. 2015

SPIE Proceedings

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Lasers beams with a specific intensity profile such as super-Gaussian, Airy or Dougnut-like are desirable in many applications such as laser materials processing, medicine and communications. We propose a new technique for laser beam shaping by amplifying a beam in an end-pumped bulk amplifier that is pumped with a beam that has a modified intensity profile. Advantages of this method are that it is relatively easy to implement, has the ability to reshape multimode beams and is naturally suited to high power/energy beams. Both three and four level gain materials can be used as amplifier media. However, a big advantage of using three level materials is their ability to attenuate of the seed beam, which enhances the contrast of the shaping.We first developed a numerical method to obtain the required pump intensity for an arbitrary beam transformation. This method was subsequently experimentally verified using a three level system. The output of a 2.07 µm seed laser was amplified in a Ho:YLF bulk amplifier which was being pumped by a 1.89 µm Tm:YLF laser which had roughly a TEM10 Hermit Gaussian intensity profile. The seed beam was amplified from 0.3 W to 0.55 W at the full pump power of 35 W. More importantly, the beam profile in one transverse direction was significantly shaped from Gaussian to roughly flat-top, as the model predicted. The concept has therefore been shown to be viable and can be used to optimise the beam profile for a wide range of applications.

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Section: Methodsmentioning

confidence: 99%

Transverse intensity transformation by laser amplifiers

Litvin¹,

King²,

Collett³

et al. 2015

SPIE Proceedings

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“…The output power of the Tm: YLF laser end-pumped by fiber-coupled laser diodes was only 55 W at 1910 nm reported by Schellhorn [7], which has a beam quality factor of M 2 less than 3 and can be tuned to the peak absorption wavelength of Ho:YAG laser of 1907.5 nm with an output power loss less than 1 W. Strauss et al [8] reported a 1890 nm Tm:YLF slab laser end-pumped by laser diode stack, which has an output power exceeded 80 W. Based on the previous reports, we know that the Tm laser with large beam quality factor and wavelength not around 1907.5 nm was not available to employ for the high-power Ho:YAG laser with end-pumping. The development of a high-output power, stable output wavelength, and good beam quality of the Tm: YLF laser are key issues in achieving high-average power Ho solid-state lasers.…”

Section: Introductionmentioning

confidence: 95%

Investigation of high-power diode-end-pumped Tm:YLF laser in slab geometry

et al. 2015

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Comparative investigations of high-power diode-end-pumped Tm:YLF laser with a-cut and c-cut slab crystals were demonstrated. A maximum output power of 87.5 W of 1907.8 nm Tm:YLF laser with two slab crystals was achieved, corresponding to a slope efficiency of 35.9% and an optical-to-optical efficiency of 32.1% with respect to the pump power. The c-cut slab Tm:YLF laser operated at 1907.8 nm with a beam quality factor of M²∼1.79 at the output power level of 71.0 W.

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“…Reflecting volume Bragg grating (VBG) is a kind of narrow-band-pass filter element based on the Bragg condition. It can be used to replace the laser resonator mirror of Tm:YLF laser to achieve narrow linewidth laser output [12][13][14]. However, the minute absorption of VBG as a cavity end mirror can cause some adverse effects on itself, including the change of spatial period Downloaded from https://www.cambridge.org/core.…”

Section: Introductionmentioning

confidence: 99%

202 W dual-end-pumped Tm:YLF laser with a VBG as an output coupler

Wei

Yang

et al. 2021

High Pow Laser Sci Eng

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We demonstrated a 202 W Tm: YLF slab laser using a reflecting volume Bragg grating (VBG) as an output coupler at room temperature. Two kinds of active heat dissipation methods were used for the VBG to suppress the shift of wavelength caused by its increasing temperature. The maximum continuous wave (CW) output power of 202 W using the microchannel cooling was obtained under the total incident pump power of 553 W, the corresponding slope efficiency and optical-to-optical conversion efficiency were 39.7% and 36.5%, respectively. The central wavelength was 1908.5 nm with the linewidth (FWHM) of 0.57 nm. Meanwhile, with the laser output increasing from 30 W to 202 W, the total shift was about 1.0 nm, and the wavelength was limited to two water absorption lines near 1908 nm. The beam quality factors M2 were measured to be 2.3 and 4.0 in x and y directions at 202 W.

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Tm:YLF slab wavelength-selected laser

Cited by 19 publications

References 10 publications

Transverse intensity transformation by laser amplifiers

Transverse intensity transformation by laser amplifiers

Investigation of high-power diode-end-pumped Tm:YLF laser in slab geometry

202 W dual-end-pumped Tm:YLF laser with a VBG as an output coupler

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