Tuneable laser
First Claim
1. A tuneable laser, comprising a light creating section to generate light and a tuneable section formed of a semiconductor material which utilizes the electro-optic effect to achieve a change in the refractive index of the material, Δ
- n, under the influence of an applied field, F, in accordance with the equation;
Δ
n=−
½
n03[rF+sF2]≡
Δ
nL+Δ
nQ where no is the refractive index at zero field and Δ
nL and Δ
nQ are the linear and quadratic contributions to the change in refractive index respectively, r is the linear electro-optic coefficient of the material and s is the quadratic electro-optic coefficient of the material, the material incorporating a plurality of quantum dots and operating in a wavelength region where the value of rF is sufficiently greater than the value of sF2, so as to operate with the dominant effect on Δ
n being contributed by the linear effect.
2 Assignments
0 Petitions
Accused Products
Abstract
A tuneable laser including a light creating section to generate light and a tuneable section formed of a semiconductor material which utilises the electro-optic effect to achieve a change in the refractive index of the material, Δn, under the influence of an applied field, F, in accordance with the equation: Δn=−½n03[rF+sF2]≡ΔnL+ΔnQ, where no is the refractive index at zero field and ΔnL and ΔnQ are the linear and quadratic contributions to the change in refractive index respectively, r is the linear electro-optic coefficient of the material and s is the quadratic electro-optic coefficient of the material, the tuning section including a waveguide and the material of the waveguide incorporating a plurality of quantum dots and operating in a wavelength region where the value of rF is sufficiently greater than the value of sF2, so as to operate with the dominant effect on Δn being contributed by the linear effect.
19 Citations
31 Claims
-
1. A tuneable laser, comprising a light creating section to generate light and a tuneable section formed of a semiconductor material which utilizes the electro-optic effect to achieve a change in the refractive index of the material, Δ
- n, under the influence of an applied field, F, in accordance with the equation;
Δ
n=−
½
n03[rF+sF2]≡
Δ
nL+Δ
nQwhere no is the refractive index at zero field and Δ
nL and Δ
nQ are the linear and quadratic contributions to the change in refractive index respectively, r is the linear electro-optic coefficient of the material and s is the quadratic electro-optic coefficient of the material, the material incorporating a plurality of quantum dots and operating in a wavelength region where the value of rF is sufficiently greater than the value of sF2, so as to operate with the dominant effect on Δ
n being contributed by the linear effect.- View Dependent Claims (2, 3, 4, 14, 15, 16, 17, 20, 21, 22, 26, 31)
- n, under the influence of an applied field, F, in accordance with the equation;
-
5. A tuneable laser, comprising a light creating section to generate light of a wavelength λ
- and a tuneable section;
the tuneable section being formed of a semiconducting material incorporating a plurality of quantum dots and exhibiting an electro-optic response thereby to permit variation of the refractive index;
the band-gap of the semiconducting material incorporating the quantum dots being such that the corresponding wavelength λ
g is less than λ
. - View Dependent Claims (6, 7, 8, 9)
- and a tuneable section;
-
10. A tuneable laser, comprising a light creating section to generate light and a tuneable section for adjusting the wavelength thereof within the range λ
-
1 and λ
2;
the tuneable section being formed of a semiconducting material incorporating a plurality of quantum dots and exhibiting an electro-optic response thereby to permit variation of the refractive index;
the band-gap of the semiconducting material incorporating the quantum dots is such that a corresponding wavelength λ
g is less than both λ
1 and λ
2 by an amount sufficient that the change in refractive index at λ
1 and λ
2 is substantially the same. - View Dependent Claims (11, 12, 13)
-
1 and λ
-
18. (canceled)
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19. (canceled)
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23. (canceled)
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24. (canceled)
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25. (canceled)
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27. (canceled)
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28. (canceled)
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29. (canceled)
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30. (canceled)
Specification