A structure and method for suppressing spontaneous emission amplification in slab lasers based on birefringent optical film layer
A spontaneous emission amplification, slab laser technology, applied in the laser field, can solve the problems of inability to distinguish between laser and spontaneous emission amplified light, decrease of laser linear polarization purity, difficult to achieve suppression, etc., so as to suppress the spontaneous emission amplification process and improve the linear polarization. The effect of purity, simple structure
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Embodiment 1
[0032] A structure based on a birefringent optical film layer to suppress the amplification of spontaneous emission in a slab laser, such as figure 1 As shown in the figure, it includes a laser gain medium 1, a birefringent optical film layer 2, a refractive index matching liquid 3 and an absorption glass 4 arranged in sequence, wherein, in this embodiment,
[0033] Refractive index of the gain medium n in = 1.54, the external medium is air, the refractive index is 1, and the reflectance curve is as follows figure 2 As shown in the figure, the critical angle for total reflection of the beam is 40.56°, and if the angle exceeds the critical angle, total internal reflection will occur. In the range of 0°~40.56°: the average reflectance of natural light is 7.81%, and the average reflectance of S light is 7.81%. 11.83%, and the average reflectance of P light is 3.79%.
Embodiment 2
[0035] In this embodiment, n in = 1.54, n tr = 1.5, n ab =1.5, the reflectance curve is as follows image 3 As shown, the critical angle for total reflection of the beam at this time is 76.91°. If the angle exceeds the critical angle, total internal reflection will occur. The reflectivity of natural light, S light, and P light are very close, and the curves basically overlap, in the range of 0~60° The internal reflectivity is extremely low and approaches 0.
Embodiment 3
[0037] In this embodiment, n in = 1.54, n tr = 1.54, n ab =1.54, n x =1.619, n y =1.432, n z =1.541, the refractive index of S light in the birefringent film layer is 1.541, and the refractive index curve of P light in the birefringent film layer is as follows Figure 4 As shown, the reflectivity curve of this embodiment is as follows Figure 5 As shown, in the range of 0~60°, the reflectivity of P light and S light is extremely low and approaches 0, and the critical angle when S light is totally reflected is still 76.98°, but P light will not be totally reflected. The average reflectivity in the range of incident angle of 76.98°~90° is less than 5%. Compared with Example 2, the reflectivity of S light is basically unchanged, while the average reflectivity of P light in the range of incident angle of 76.98°~90° is reduced by more than 95%. %.
[0038] It can be seen that this method effectively solves the problem of suppressing the spontaneous emission amplificati...
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