Pavel A. Loiko, Konstantin V. Yumashev, Nikolai V. Kuleshov, and Anatoly A. Pavlyuk, "Thermo-optic coefficients and thermal lensing in Nd-doped KGd(WO4)2 laser crystals," Appl. Opt. 49, 6651-6659 (2010)
We measured the thermo-optic coefficients of anisotropic crystals at the wavelengths of and () by a beam deflection method. The values of are determined to be , , and (at ) and , , and (at ). Thermal lensing in the flashlamp-pumped - and -cut laser rods was studied at by a probe beam technique in the nonlasing conditions, and the contribution of the photoelastic term to the thermal lens optical power was estimated. Athermal propagation directions with the definitions and were found in .
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Thermal Lens Sensitivity Factors of the Studied Laser Rods and Thermal Lens Astigmatism Degree at the Probe Beam Wavelength of a
Probe Beam Polarization
Measurement Direction
Laser Rods
-cut Nd:KGW
-cut Nd:KGW
M
S
M
S
A
()
0.87 (0.84)
0.97 (0.87)
0.29 (0.53)
B
(0.13)
1.26 (1.4)
A
()
3.70 (2.63)
(0.38)
0.80 (0.06)
B
(0.13)
0.33 (0.44)
In brackets, the results for the probe wavelength 632.8 nm [35] are added for comparison. , probe beam polarization. Directions A and B are shown in Fig. 3.
Table 4
Values of Thermo-Optic Coefficients , Term Related with the Stress-Dependent Variation of the Refractive Index , Term Related with the Crystal End Faces Bulging under Pumping Due to the Thermal Expansion , and Their Sum for the Studied Flashlamp-Pumped - and -Cut Nd:KGW Laser Rods at the Light Wavelength of a
Probe Beam Polarization
Meridional Plane
-cut Nd:KGW
A
()
9.0 (8.2)
0.17 (0.17)
()
B
11.2 (10.3)
(0.33)
A
()
9.2 (9.5)
0.18 (0.18)
()
B
18.5 (16.1)
(0.33)
-cut Nd:KGW
A
()
11.5 (11.2)
1.06 (1.09)
2.43 (2.18)
B
13.9 (12.6)
3.16 (3.52)
A
()
13.7 (14.7)
1.03 (1.06)
(0.95)
B
15.7 (14.8)
0.83 (1.11)
In brackets, the results for 632.8 nm calculated from [35, 37] are added for comparison. , probe beam polarization. Directions A and B are shown in Fig. 3.
Tables (4)
Table 1
Thermal Coefficients of the Optical Path of Nd (3 at.%):KGW and KGW Crystals at the Wavelengths of and 532 nm
Nd:KGW
—
—
—
—
—
—
—
—
—
KGW
—
—
—
—
—
—
Table 2
Thermo-optic Coefficients of Nd (3 at.%):KGW and KGW Crystals at the Wavelengths of , 632.8 nm (Adopted from [37]) and 532 nm
Thermal Lens Sensitivity Factors of the Studied Laser Rods and Thermal Lens Astigmatism Degree at the Probe Beam Wavelength of a
Probe Beam Polarization
Measurement Direction
Laser Rods
-cut Nd:KGW
-cut Nd:KGW
M
S
M
S
A
()
0.87 (0.84)
0.97 (0.87)
0.29 (0.53)
B
(0.13)
1.26 (1.4)
A
()
3.70 (2.63)
(0.38)
0.80 (0.06)
B
(0.13)
0.33 (0.44)
In brackets, the results for the probe wavelength 632.8 nm [35] are added for comparison. , probe beam polarization. Directions A and B are shown in Fig. 3.
Table 4
Values of Thermo-Optic Coefficients , Term Related with the Stress-Dependent Variation of the Refractive Index , Term Related with the Crystal End Faces Bulging under Pumping Due to the Thermal Expansion , and Their Sum for the Studied Flashlamp-Pumped - and -Cut Nd:KGW Laser Rods at the Light Wavelength of a
Probe Beam Polarization
Meridional Plane
-cut Nd:KGW
A
()
9.0 (8.2)
0.17 (0.17)
()
B
11.2 (10.3)
(0.33)
A
()
9.2 (9.5)
0.18 (0.18)
()
B
18.5 (16.1)
(0.33)
-cut Nd:KGW
A
()
11.5 (11.2)
1.06 (1.09)
2.43 (2.18)
B
13.9 (12.6)
3.16 (3.52)
A
()
13.7 (14.7)
1.03 (1.06)
(0.95)
B
15.7 (14.8)
0.83 (1.11)
In brackets, the results for 632.8 nm calculated from [35, 37] are added for comparison. , probe beam polarization. Directions A and B are shown in Fig. 3.