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Continuous-wave broadly tunable high-power Cr:CdS laser.

Sorokin E, Klimentov D, Frolov MP, Korostelin YV, Kozlovsky VI, Podmar'kov YP, Skasyrsky YK, Sorokina IT - Appl Phys B (2014)

Bottom Line: Lifetime values vary from 7.6 µs at 8 K to 0.48 µs at 320 K, corresponding to 22 % quantum yield at 285 K.Under Tm-fiber laser pumping, the continuous-wave output reached 1.8 W at 2.5 μm with 35.5 % slope efficiency.With a single CaF2 prism, the CW Cr(2+):CdS laser could be tuned from 2.240 to 3.285 µm.

View Article: PubMed Central - PubMed

Affiliation: Institut für Photonik, TU Wien, Gusshausstrasse 27/387, 1040 Vienna, Austria.

ABSTRACT

We report spectroscopic characteristics and laser properties of the mid-infrared active laser medium Cr(2+):CdS. Temperature-dependent absorption, luminescence and lifetime measurements of the (5)E exited state allow determination of peak emission cross section value of 1.35 × 10(-18) cm(2) in σ-polarization at room temperature. Lifetime values vary from 7.6 µs at 8 K to 0.48 µs at 320 K, corresponding to 22 % quantum yield at 285 K. Under Tm-fiber laser pumping, the continuous-wave output reached 1.8 W at 2.5 μm with 35.5 % slope efficiency. With a single CaF2 prism, the CW Cr(2+):CdS laser could be tuned from 2.240 to 3.285 µm.

No MeSH data available.


Polarized absorption and emission spectra of Cr:CdS at 9 and 285 K
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Fig2: Polarized absorption and emission spectra of Cr:CdS at 9 and 285 K

Mentions: Figure 2 shows absorption and emission (gain) cross section spectra of Cr2+:CdS recorded at 9 and 285 K. The high-frequency noise in the spectra around 2.7 µm is due to the atmospheric water vapor absorption, not completely eliminated in the correction. The room-temperature infrared emission of Cr2+:CdS centers at ~2.6 µm with a bandwidth of 1,100 nm full-width at half-maximum and extends to much longer wavelengths than that of Cr2+:ZnSe, giving the possibility of extended tuning in the mid-infrared well above 3 µm. It is interesting to note that σ-polarization is 15–20 % stronger than π-polarization for both absorption and emission and should be preferred in laser design.Fig. 2


Continuous-wave broadly tunable high-power Cr:CdS laser.

Sorokin E, Klimentov D, Frolov MP, Korostelin YV, Kozlovsky VI, Podmar'kov YP, Skasyrsky YK, Sorokina IT - Appl Phys B (2014)

Polarized absorption and emission spectra of Cr:CdS at 9 and 285 K
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4372838&req=5

Fig2: Polarized absorption and emission spectra of Cr:CdS at 9 and 285 K
Mentions: Figure 2 shows absorption and emission (gain) cross section spectra of Cr2+:CdS recorded at 9 and 285 K. The high-frequency noise in the spectra around 2.7 µm is due to the atmospheric water vapor absorption, not completely eliminated in the correction. The room-temperature infrared emission of Cr2+:CdS centers at ~2.6 µm with a bandwidth of 1,100 nm full-width at half-maximum and extends to much longer wavelengths than that of Cr2+:ZnSe, giving the possibility of extended tuning in the mid-infrared well above 3 µm. It is interesting to note that σ-polarization is 15–20 % stronger than π-polarization for both absorption and emission and should be preferred in laser design.Fig. 2

Bottom Line: Lifetime values vary from 7.6 µs at 8 K to 0.48 µs at 320 K, corresponding to 22 % quantum yield at 285 K.Under Tm-fiber laser pumping, the continuous-wave output reached 1.8 W at 2.5 μm with 35.5 % slope efficiency.With a single CaF2 prism, the CW Cr(2+):CdS laser could be tuned from 2.240 to 3.285 µm.

View Article: PubMed Central - PubMed

Affiliation: Institut für Photonik, TU Wien, Gusshausstrasse 27/387, 1040 Vienna, Austria.

ABSTRACT

We report spectroscopic characteristics and laser properties of the mid-infrared active laser medium Cr(2+):CdS. Temperature-dependent absorption, luminescence and lifetime measurements of the (5)E exited state allow determination of peak emission cross section value of 1.35 × 10(-18) cm(2) in σ-polarization at room temperature. Lifetime values vary from 7.6 µs at 8 K to 0.48 µs at 320 K, corresponding to 22 % quantum yield at 285 K. Under Tm-fiber laser pumping, the continuous-wave output reached 1.8 W at 2.5 μm with 35.5 % slope efficiency. With a single CaF2 prism, the CW Cr(2+):CdS laser could be tuned from 2.240 to 3.285 µm.

No MeSH data available.