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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 8 — Aug. 1, 2012
  • pp: 1064–1075
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Tm3+/Ho3+ co-doped LiGd(MoO4)2 crystal as laser gain medium around 2.0 μm

Jianfeng Tang, Yujin Chen, Yanfu Lin, Xinghong Gong, Jianhua Huang, Zundu Luo, and Yidong Huang  »View Author Affiliations


Optical Materials Express, Vol. 2, Issue 8, pp. 1064-1075 (2012)
http://dx.doi.org/10.1364/OME.2.001064


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Abstract

Tm3+/Ho3+ co-doped LiGd(MoO4)2 (LGM) crystals were investigated as gain media for the Ho3+ laser around 2.0 μm. Polarized spectroscopic parameters of Ho3+ ions in the crystals were calculated based on the absorption spectra by the Judd-Ofelt theory. Related fluorescence spectra and decay curves were measured and analyzed for the crystals with different Tm3+/Ho3+ co-doped concentrations, 5.4/1.4 and 4.6/0.6 at.%. Stimulated emission cross sections of the 5I75I8 transition of Ho3+ ions were derived according to the Füchtbauer-Ladenburg formula. End-pumped by a pulsed diode laser at 795 nm, the Ho3+ laser at 2.05 μm with a slope efficiency of 20% was realized in a c-cut crystal sample with the Tm3+/Ho3+ concentrations of 4.6/0.6 at.%.

© 2012 OSA

1. Introduction

Ho3+-doped crystals have been widely studied for lasing around 2.0 μm via the 5I75I8 transition. The laser is eye-safe and matches well with the absorption lines of H2O and CO2. Therefore, a number of applications such as coherent lidar, atmospheric sensing, and surgery are possible [1

1. S. W. Henderson, P. J. M. Suni, C. P. Hale, S. M. Hannon, J. R. Magee, D. L. Bruns, and E. H. Yuen, “Coherent laser-radar at 2 μm using solid-state lasers,” IEEE Trans. Geosci. Rem. Sens. 31(1), 4–15 (1993). [CrossRef]

3

3. B. Walsh, “Review of Tm and Ho materials; spectroscopy and lasers,” Laser Phys. 19(4), 855–866 (2009). [CrossRef]

]. Furthermore, the laser operating in ultrafast pulse regime can also be used in time-resolved spectroscopy and as pumping source for the optical parametric oscillator (OPO) in the mid-infrared region [4

4. A. A. Lagatsky, F. Fusari, S. Calvez, S. V. Kurilchik, V. E. Kisel, N. V. Kuleshov, M. D. Dawson, C. T. A. Brown, and W. Sibbett, “Femtosecond pulse operation of a Tm,Ho-codoped crystalline laser near 2 μm,” Opt. Lett. 35(2), 172–174 (2010). [CrossRef] [PubMed]

,5

5. P. A. Budni, L. A. Pomeranz, M. L. Lemons, C. A. Miller, J. R. Mosto, and E. P. Chicklis, “Efficient mid-infrared laser using 1.9-μm-pumped Ho:YAG and ZnGeP2 optical parametric oscillators,” J. Opt. Soc. Am. B 17(5), 723–728 (2000). [CrossRef]

]. Research of gain media for realizing the pulse laser has recently attracted substantial attentions. Generally, Tm3+ or Yb3+ ions, which has large absorption cross section at the emitting wavelengths of the commercially available high power laser diodes (LD), is co-doped as sensitizer for improving pump absorption [6

6. V. Kushawaha, Y. Chen, Y. Yan, and L. Major, “High-efficiency continuous-wave diode-pumped Tm:Ho:LuAG laser at 2.1 μm,” Appl. Phys. B 62(1), 109–111 (1996). [CrossRef]

9

9. S. D. Jackson and S. Mossman, “Diode-cladding-pumped Yb3+, Ho3+-doped silica fiber laser operating at 2.1-μm,” Appl. Opt. 42(18), 3546–3549 (2003). [CrossRef] [PubMed]

]. The processes of energy transfers from Tm3+ and Yb3+ to Ho3+ ions are schemed in Fig. 1
Fig. 1 Schematic of energy transfer from Tm3+ to Ho3+ ions and Yb3+ to Ho3+ ions.
. Notably for the Tm3+/Ho3+ co-doped system, a maximal pump quantum efficiency close to 2 could be expected due to the cross relaxation (CR) of Tm3+ ions, 3H4 + 3H63F4 + 3F4.

2. Experimental procedure

Two Tm3+/Ho3+ and one Yb3+/Ho3+ co-doped LGM single crystals were grown by the Czochralski method in air at about 1030 °C. After growth the crystals were annealed at about 850 °C for 10 hours to reduce the residual stress. The doping concentrations measured by an inductively coupled plasma atomic emission spectrometer (Ultima 2, Jobin-Yvon) are 5.4/1.4 and 4.6/0.6 at.% for the two Tm3+/Ho3+ co-doped crystals and 7.7/1.4 at.% for the Yb3+/Ho3+ co-doped crystal (hereafter 5.4/1.4 TH, 4.6/0.6 TH and 7.7/1.4 YH for short, respectively). Oriented crystal samples were cut and polished for spectral experiments with dimensions (crystallographic a × b × c) of 2.70 × 10 × 10, 1.88 × 7 × 8, and 2.20 × 5 × 7 mm3, respectively. No gas bubbles or inclusions were found in these samples. The optical quality of the crystals was examined by a ZYGO GPI optical interferometer. The interference fringes are straight and have a uniform distribution which shows the crystals have good optical homogeneity. Figure 2
Fig. 2 Interference fringes for 4.6/0.6 TH crystal sample.
shows the result for the 4.6/0.6 TH. The polarized absorption spectra were measured using a UV/VIS/NIR spectrophotometer (Lambda 900, Perkin-Elmer) with a scanning step of 0.5 nm. A deuterium lamp (UV) and a tungsten-halogen lamp (VIS/NIR) were equipped as the light sources. The polarized fluorescence spectra were measured by a TE-cooled PbS detector in the NIR region associated with a monochromator (Triax 550, Jobin-Yvon) ahead of it, a Ti:sapphire laser operating at 795 nm and an InGaAs LD operating at 970 nm were used as exciting sources for the Tm3+ and Yb3+ ions, respectively, with a measured resolution of 1.0 nm. The fluorescence decay curves were measured by a spectrometer (FLSP920, Edinburgh) with a Hamamatsu R928 PMT and an InSb detectors in the VIS and NIR regions, respectively, a tunable mid-band OPO laser (Vibrant 355II, OPOTEK) with pulse duration of about 5 ns was adopted as the exciting source. In fluorescence experiments front-surface excitation-detection was used to measure fluorescence spectra of the crystal samples in order to minimize the impact of re-absorption. Additionally, the excitation intensity was always kept as low as possible to avoid some possible amplified spontaneous emission. All of the spectral experiments were carried out at room temperature.

3. Results and discussion

3.1 Absorption and Judd-Ofelt analysis

Absorption spectra of the 7.7/1.4 YH in a range of 350−2200 nm were measured for two different polarizations of σ (E⊥c, E represents the electric field direction of incident light) and π (E//c) and are shown in Fig. 3
Fig. 3 Polarized absorption spectra of 7.7/1.4 YH crystal in a range of 350−2200 nm.
. It can be found that the absorption of Ho3+ ions exhibits a strong anisotropic behavior. The Yb3+ ions have only an intense absorption band around 980 nm and do not influence the absorption of Ho3+ ions in other measured spectral region. The Judd-Ofelt (J-O) theory [13

13. B. R. Judd, “Optical absorption intensities of rare-earth ions,” Phys. Rev. 127(3), 750–761 (1962). [CrossRef]

,14

14. G. S. Ofelt, “Intensities of crystal spectra of rare-earth ions,” J. Chem. Phys. 37(3), 511–520 (1962). [CrossRef]

] was applied to determine the intermultiplet spontaneous transition rates of Ho3+ ions in LGM crystal. The J-O intensity parameters Ωt (t = 2, 4, 6) were fitted by adopting the six easily distinguishable absorption bands corresponding to the transitions from the ground 5I8 multiplet to the excited 5I7, 5I6, 5F5, 5F4 + 5S2, 5F1 + 5G6, and 3G5 multiplets. The calculation procedure can be found in the literature [15

15. B. M. Walsh, N. P. Barnes, and B. Di Bartolo, “Branching ratios, cross sections, and radiative lifetimes of rare earth ions in solids: application to Tm3+ and Ho3+ ions in LiYF4,” J. Appl. Phys. 83(5), 2772–2787 (1998). [CrossRef]

,16

16. W. Guo, Y. Chen, Y. Lin, Z. Luo, X. Gong, and Y. Huang, “Spectroscopic properties and laser performance of Tm3+-doped NaLa(MoO4)2 crystal,” J. Appl. Phys. 103(9), 093106 (2008). [CrossRef]

] and the refractive index has been estimated in [17

17. A. A. Kaminskii, A. A. Mayer, N. S. Nikonova, M. V. Provotorov, and S. E. Sarkisov, “Stimulated emission from the new LiGd(MoO4)2:Nd3+ crystal laser,” Phys. Status Solidi A 12(2), K73–K75 (1972). [CrossRef]

]. The contribution of the magnetic dipole (MD) transition of 5I85I7 was excluded before the calculation. The values of the reduced matrix elements of unit tensor operators and the coefficients of the intermediate coupling wavefunctions were taken from [18

18. M. J. Weber, B. H. Matsinger, V. L. Donlan, and G. T. Surratt, “Optical transition probabilities for trivalent holmium in LaF3 and YAlO3,” J. Chem. Phys. 57(1), 562–567 (1972). [CrossRef]

] and [19

19. K. Rajnak and W. F. Krupke, “Energy levels of Ho3+ in LaCl3,” J. Chem. Phys. 46(9), 3532–3542 (1967). [CrossRef]

], respectively. The mean wavelength (λ¯), the experimental oscillator strength (fEDexp), and the oscillator strength calculated from the J-O intensity parameters (fEDcalc) for each band are listed in Table 1

Table 1. Mean wavelengths and experimental and calculated absorption oscillator strengths for ED transitions of Ho3+ in LGM crystal

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. The root mean square (rms) deviations between the experimental and calculated oscillator strengths are 0.95 × 10−6 and 2.42 × 10−6 for σ and π polarizations, respectively. Both are in the typical error range of the J-O fitting [20

20. A. Méndez-Blas, M. Rico, V. Volkov, C. Zaldo, and C. Cascales, “Crystal field analysis and emission cross sections of Ho3+ in the locally disordered single-crystal laser hosts M+Bi(XO4)2 (M+ = Li,Na; X = W, Mo),” Phys. Rev. B 75(17), 174208 (2007). [CrossRef]

]. The intensity parameters for Ho3+ ions in LGM crystal are listed in Table 2

Table 2. J-O intensity parameters of Ho3+ in LGM crystal (in unit of 10−20 cm2)

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and the effective J-O intensity parameters were calculated according to Ωteff=(2Ωtσ+Ωtπ)/3. These parameters are comparable to those of Ho3+ in KGd(WO4)2 crystal [21

21. M. C. Pujol, J. Massons, M. Aguiló, F. Díaz, M. Rico, and C. Zaldo, “Emission cross sections and spectroscopy of Ho3+ laser channels in KGd(WO4)2 single crystal,” IEEE J. Quantum Electron. 38(1), 93–100 (2002). [CrossRef]

].

The intermultiplet electric dipole (ED) spontaneous transition rates (AEDq) of Ho3+ were calculated from the intensity parameters for both polarizations (q = σ and π) and are listed in Table 3

Table 3. Spontaneous transition rates, fluorescence branching ratios, and radiative lifetimes of Ho3+ in LGM crystal

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. Taking the MD transition rates (AMD) into account, the average spontaneous transition rates could be calculated by A=(2Aσ+Aπ)/3 with Aq=AEDq+AMDq. Then the fluorescence branching ratios (β) and the radiative lifetimes (τr) could be further calculated and the results are also listed in Table 3.

The polarized absorption spectra were also measured for the Tm3+/Ho3+ co-doped LGM crystals in a range of 750−850 nm. Since the absorption cross sections corresponding to the 3H63H4 transition of Tm3+ ions are nearly identical for both 5.4/1.4 TH and 4.6/0.6 TH, only the spectra of the latter are shown in Fig. 4
Fig. 4 Polarized absorption spectra of 4.6/0.6 TH crystal in a range of 750–850 nm.
for brevity. The peak absorption cross sections were 4.66 × 10−20 cm2 for σ polarization at 795 nm and 1.93 × 10−20 cm2 for π polarization at 781 nm, with band widths of 8 and 37 nm, respectively. Both the peak values are slightly larger than those of the Tm3+ singly doped LGM, respectively [12

12. J. Tang, Y. Chen, Y. Lin, X. Gong, J. Huang, Z. Luo, and Y. Huang, “Polarized spectral properties and laser demonstration of Tm3+-doped LiGd(MoO4)2 crystal,” J. Opt. Soc. Am. B 27(9), 1769–1777 (2010). [CrossRef]

]. Taking into account the typical wavelength drift with temperature is about 0.3 nm/K and the spectral bandwidth is 3 to 6 nm for commercial LD pumping source, the stronger absorption of Tm3+/Ho3+ co-doped LGM in σ polarization should be ideal for LD pumping.

3.2 Fluorescence and stimulated emission cross sections

When the Yb3+ ions were excited to the 2F5/2 multiplet at 970 nm, the polarized fluorescence spectra of 7.7/1.4 YH around 2.0 μm were measured and are shown in Fig. 5(a)
Fig. 5 Polarized fluorescence spectra of 7.7/1.4 YH (a) under excitation at 970 nm; 5.4/1.4 TH (b) and 4.6/0.6 TH (c) under excitation at 795 nm.
. The emission bands in the range of 1900−2100 nm with peaks around 2050 nm are attributed to the 5I75I8 transition of Ho3+ ions. Under excitation at 795 nm, the Tm3+ ions were excited to the 3H4 multiplet and the polarized fluorescence spectra of both 5.4/1.4 TH and 4.6/0.6 TH were measured and are shown in Figs. 5(b) and 5(c), respectively. The emission bands of Tm3+ ions corresponding to the transition of 3F43H6 can still be found in the range of 1650−1950 nm, which suggests that the energy transfer from Tm3+ to Ho3+ is not complete. Furthermore, the ratio of the integrated fluorescence intensity of Ho3+ ions to that of both Tm3+ and Ho3+ ions, i.e., Ho3+I(λ)dλ/Tm3++Ho3+I(λ)dλ, in the entire emission band of 1650−2100 nm in one co-doped crystal, can be used as a measure for the net energy transfer efficiency from Tm3+ to Ho3+. The ratio in 5.4/1.4 TH is larger compared with that for 4.6/0.6 TH just indicates a preferred energy distribution on Ho3+ ions in the higher co-doped case.

The fluorescence decay curves for the 3H4 multiplet of Tm3+ ions were measured for both 5.4/1.4 TH and 4.6/0.6 TH and are shown in Fig. 6
Fig. 6 Fluorescence decay curves for the 3H4 multiplet of Tm3+ ions for 5.4/1.4 TH and 4.6/0.6 TH. The exciting and monitoring wavelengths are 783 and 810 nm, respectively.
in semi-log scale. The exciting and monitoring wavelengths were 783 and 810 nm, respectively. Both decay curves display a departure from the single exponential behavior. The mean fluorescence lifetimes are estimated 18 and 28 μs for 5.4/1.4 TH and 4.6/0.6 TH, respectively, according to τf=0tI(t)dt/0I(t)dt where I(t) is the fluorescence intensity at time t [22

22. G. C. Righini and M. Ferrari, “Photoluminescence of rare-earth-doped glasses,” Riv. Nuovo Cim. 28, 1–53 (2005).

]. Since an intrinsic lifetime τ0 = 134 μs for the 3H4 multiplet has been reported in a 0.79 at.% Tm3+ singly doped LGM crystal [12

12. J. Tang, Y. Chen, Y. Lin, X. Gong, J. Huang, Z. Luo, and Y. Huang, “Polarized spectral properties and laser demonstration of Tm3+-doped LiGd(MoO4)2 crystal,” J. Opt. Soc. Am. B 27(9), 1769–1777 (2010). [CrossRef]

], the energy transfer efficiency (η) for Tm3+ ions on the 3H4 multiplet were estimated 87% and 79% for 5.4/1.4 TH and 4.6/0.6 TH, respectively, by η=1τf/τ0 and the energy transfer should be firstly attributed to the cross relaxation (3H4 + 3H63F4 + 3F4) between Tm3+ ions.

Using the absorption and emission cross sections derived above, the wavelength dependence of the gain cross sections can be calculated by [26

26. K. Ohta, H. Saito, and M. Obara, “Spectroscopic characterization of Tm3+-YVO4 crystal as an efficient diode pumped laser source near 2000-nm,” J. Appl. Phys. 73(7), 3149–3152 (1993). [CrossRef]

]
σGq(λ)=PσEMq(λ)(1P)σGSAq(λ).
(2)
where P represents the population inversion defined as the ratio of the Ho3+ ions at the 5I7 multiplet to those at both the 5I7 and 5I8 multiplets, σGSAq is the absorption cross section. Figure 10
Fig. 10 Polarized gain cross sections for 5I75I8 transition of Ho3+ ions in LGM crystal with different values of population inversion P (P = 0.3, 0.4, …, 0.7).
shows the calculated gain cross sections for several values of P (P = 0.3, 0.4, …, 0.7) for both polarizations. To take the P = 0.5 for an example, it can be seen that the gain for π polarization is larger than that for σ polarization and the theoretical tunable range of Ho3+ laser covers from 1975 to 2100 nm.

3.3 Laser demonstration

In order to assess the laser performance of the Tm3+/Ho3+ co-doped LGM, an end-pumped plano-concave resonator was adopted with a fiber-coupled pulsed LD emitting at 795 nm as the pumping source. The pump beam was modulated with a duty cycle of 2% and a modulation frequency of 10 Hz. It passed through an input coupler which had a 90% transmission at 795 nm and a reflectivity of R > 99% in the region between 1900 and 2100 nm. The crystal sample, without any antireflection coating, was held in an aluminum mount and positioned to the input coupler as close as possible. The diameter of pump beam inside the gain medium was about 115 μm. Three output couplers with transmissions TOC = 0.7%, 2.4%, and 3.9% around 2.0 μm and the same curvature radius of 100 mm were adopted in the experiment, respectively. The length of the plano-concave cavity was set close to the curvature radius of the output couplers.

The Ho3+ laser around 2.0 μm operating at room temperature is a quasi-three-level system. The reason for the lack of laser demonstration in the higher co-doped 5.4/1.4 TH sample may be mainly attributed to the stronger re-absorption loss.

4. Conclusion

A 2.05 μm Ho3+ laser has been realized in a 1.10-mm-thick c-cut 4.6/0.6 TH sample with a fiber-coupled pulsed LD end-pumped at 795 nm. The slope efficiency of 20% was achieved at the output coupler transmission of 3.9% and the maximum average output power was 25 mW when the absorbed pump power was 138 mW. Since a continuous wave Ho3+ laser with slope efficiency as high as 48% has been realized in another isostructural 5/0.25 at.% Tm3+/Ho3+ co-doped NaY(WO4)2 crystal when a V-type astigmatically-compensated resonator has been adopted [27

27. X. Han, F. Fusari, M. D. Serrano, A. A. Lagatsky, J. M. Cano-Torres, C. T. A. Brown, C. Zaldo, and W. Sibbett, “Continuous-wave laser operation of Tm and Hoco-doped NaY(WO4)2 and NaLu(WO4)2 crystals,” Opt. Express 18(6), 5413–5419 (2010). [CrossRef] [PubMed]

], a better result can be expected for the Tm3+/Ho3+ co-doped LGM crystal by further optimizing the concentrations of Tm3+/Ho3+ ions and configuration of laser cavity.

Acknowledgments

This work has been supported by the National Natural Science Foundation of China (grant 50972142), the Knowledge Innovation Program of the Chinese Academy of Sciences (grant KJCX2-EW-H03-01), and the Chinese National Engineering Research Center for Optoelectronic Crystalline Materials.

References and links

1.

S. W. Henderson, P. J. M. Suni, C. P. Hale, S. M. Hannon, J. R. Magee, D. L. Bruns, and E. H. Yuen, “Coherent laser-radar at 2 μm using solid-state lasers,” IEEE Trans. Geosci. Rem. Sens. 31(1), 4–15 (1993). [CrossRef]

2.

R. M. Mihalcea, M. E. Webber, D. S. Baer, R. K. Hanson, G. S. Feller, and W. B. Chapman, “Diode-laser absorption measurements of CO2, H2O, N2O, and NH3 near 2.0 μm,” Appl. Phys. B 67(3), 283–288 (1998). [CrossRef]

3.

B. Walsh, “Review of Tm and Ho materials; spectroscopy and lasers,” Laser Phys. 19(4), 855–866 (2009). [CrossRef]

4.

A. A. Lagatsky, F. Fusari, S. Calvez, S. V. Kurilchik, V. E. Kisel, N. V. Kuleshov, M. D. Dawson, C. T. A. Brown, and W. Sibbett, “Femtosecond pulse operation of a Tm,Ho-codoped crystalline laser near 2 μm,” Opt. Lett. 35(2), 172–174 (2010). [CrossRef] [PubMed]

5.

P. A. Budni, L. A. Pomeranz, M. L. Lemons, C. A. Miller, J. R. Mosto, and E. P. Chicklis, “Efficient mid-infrared laser using 1.9-μm-pumped Ho:YAG and ZnGeP2 optical parametric oscillators,” J. Opt. Soc. Am. B 17(5), 723–728 (2000). [CrossRef]

6.

V. Kushawaha, Y. Chen, Y. Yan, and L. Major, “High-efficiency continuous-wave diode-pumped Tm:Ho:LuAG laser at 2.1 μm,” Appl. Phys. B 62(1), 109–111 (1996). [CrossRef]

7.

G. Rustad and K. Stenersen, “Low threshold laser-diode side-pumped Tm:YAG and Tm:Ho:YAG lasers,” IEEE J. Sel. Top. Quantum Electron. 3(1), 82–89 (1997). [CrossRef]

8.

A. Diening, B.-M. Dicks, E. Heumann, R. Groß, and G. Huber, “970 nm diode pumped Yb, Tm and Yb,Ho:YAG laser in the 2 μm spectral region,” in Advanced Solid State Lasers, C. R. Pollock and W. R. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 1997), pp. 202–204.

9.

S. D. Jackson and S. Mossman, “Diode-cladding-pumped Yb3+, Ho3+-doped silica fiber laser operating at 2.1-μm,” Appl. Opt. 42(18), 3546–3549 (2003). [CrossRef] [PubMed]

10.

A. A. Lagatsky, X. Han, M. D. Serrano, C. Cascales, C. Zaldo, S. Calvez, M. D. Dawson, J. A. Gupta, C. T. A. Brown, and W. Sibbett, “Femtosecond (191 fs) NaY(WO4)2 Tm,Ho-codoped laser at 2060 nm,” Opt. Lett. 35(18), 3027–3029 (2010). [CrossRef] [PubMed]

11.

C. Cascales, A. Méndez-Blas, M. Rico, V. Volkov, and C. Zaldo, “The optical spectroscopy of lanthanides R3+ in ABi(XO4)2 (A = Li, Na; X = Mo, W) and LiYb(MoO4)2 multifunctional single crystals: relationship with the structural local disorder,” Opt. Mater. 27(11), 1672–1680 (2005). [CrossRef]

12.

J. Tang, Y. Chen, Y. Lin, X. Gong, J. Huang, Z. Luo, and Y. Huang, “Polarized spectral properties and laser demonstration of Tm3+-doped LiGd(MoO4)2 crystal,” J. Opt. Soc. Am. B 27(9), 1769–1777 (2010). [CrossRef]

13.

B. R. Judd, “Optical absorption intensities of rare-earth ions,” Phys. Rev. 127(3), 750–761 (1962). [CrossRef]

14.

G. S. Ofelt, “Intensities of crystal spectra of rare-earth ions,” J. Chem. Phys. 37(3), 511–520 (1962). [CrossRef]

15.

B. M. Walsh, N. P. Barnes, and B. Di Bartolo, “Branching ratios, cross sections, and radiative lifetimes of rare earth ions in solids: application to Tm3+ and Ho3+ ions in LiYF4,” J. Appl. Phys. 83(5), 2772–2787 (1998). [CrossRef]

16.

W. Guo, Y. Chen, Y. Lin, Z. Luo, X. Gong, and Y. Huang, “Spectroscopic properties and laser performance of Tm3+-doped NaLa(MoO4)2 crystal,” J. Appl. Phys. 103(9), 093106 (2008). [CrossRef]

17.

A. A. Kaminskii, A. A. Mayer, N. S. Nikonova, M. V. Provotorov, and S. E. Sarkisov, “Stimulated emission from the new LiGd(MoO4)2:Nd3+ crystal laser,” Phys. Status Solidi A 12(2), K73–K75 (1972). [CrossRef]

18.

M. J. Weber, B. H. Matsinger, V. L. Donlan, and G. T. Surratt, “Optical transition probabilities for trivalent holmium in LaF3 and YAlO3,” J. Chem. Phys. 57(1), 562–567 (1972). [CrossRef]

19.

K. Rajnak and W. F. Krupke, “Energy levels of Ho3+ in LaCl3,” J. Chem. Phys. 46(9), 3532–3542 (1967). [CrossRef]

20.

A. Méndez-Blas, M. Rico, V. Volkov, C. Zaldo, and C. Cascales, “Crystal field analysis and emission cross sections of Ho3+ in the locally disordered single-crystal laser hosts M+Bi(XO4)2 (M+ = Li,Na; X = W, Mo),” Phys. Rev. B 75(17), 174208 (2007). [CrossRef]

21.

M. C. Pujol, J. Massons, M. Aguiló, F. Díaz, M. Rico, and C. Zaldo, “Emission cross sections and spectroscopy of Ho3+ laser channels in KGd(WO4)2 single crystal,” IEEE J. Quantum Electron. 38(1), 93–100 (2002). [CrossRef]

22.

G. C. Righini and M. Ferrari, “Photoluminescence of rare-earth-doped glasses,” Riv. Nuovo Cim. 28, 1–53 (2005).

23.

B. M. Walsh, N. P. Barnes, and B. D. Bartolo, “The temperature dependence of energy transfer between the Tm 3F4 and Ho 5I7 manifolds of Tm-sensitized Ho luminescence in YAG and YLF,” J. Lumin. 90(1-2), 39–48 (2000). [CrossRef]

24.

T. Y. Fan, G. Huber, R. L. Byer, and P. Mitzscherlich, “Spectroscopy and diode laser-pumped operation of Tm, Ho-YAG,” IEEE J. Quantum Electron. 24(6), 924–933 (1988). [CrossRef]

25.

Z. Luo, Y. Huang, and X. Chen, Spectroscopy of Solid-State Laser and Luminescent Materials (Nova Science Publishers, New York, 2007).

26.

K. Ohta, H. Saito, and M. Obara, “Spectroscopic characterization of Tm3+-YVO4 crystal as an efficient diode pumped laser source near 2000-nm,” J. Appl. Phys. 73(7), 3149–3152 (1993). [CrossRef]

27.

X. Han, F. Fusari, M. D. Serrano, A. A. Lagatsky, J. M. Cano-Torres, C. T. A. Brown, C. Zaldo, and W. Sibbett, “Continuous-wave laser operation of Tm and Hoco-doped NaY(WO4)2 and NaLu(WO4)2 crystals,” Opt. Express 18(6), 5413–5419 (2010). [CrossRef] [PubMed]

OCIS Codes
(140.3380) Lasers and laser optics : Laser materials
(140.3580) Lasers and laser optics : Lasers, solid-state
(160.5690) Materials : Rare-earth-doped materials

ToC Category:
Laser Materials

History
Original Manuscript: February 9, 2012
Revised Manuscript: June 5, 2012
Manuscript Accepted: July 16, 2012
Published: July 18, 2012

Citation
Jianfeng Tang, Yujin Chen, Yanfu Lin, Xinghong Gong, Jianhua Huang, Zundu Luo, and Yidong Huang, "Tm3+/Ho3+ co-doped LiGd(MoO4)2 crystal as laser gain medium around 2.0 μm," Opt. Mater. Express 2, 1064-1075 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-8-1064


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References

  1. S. W. Henderson, P. J. M. Suni, C. P. Hale, S. M. Hannon, J. R. Magee, D. L. Bruns, and E. H. Yuen, “Coherent laser-radar at 2 μm using solid-state lasers,” IEEE Trans. Geosci. Rem. Sens.31(1), 4–15 (1993). [CrossRef]
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