Single-photon raman optical frequency comb source

Patent metadata

Field	Value
Publication number	US-2024421552-A1
Application number	US-202318716704-A
Country	US
Kind code	A1
Filing date	Apr 21, 2023
Priority date	Apr 21, 2023
Publication date	Dec 19, 2024
Grant date	—

Abstract

A single-photon Raman optical frequency comb source is provided, including: a light source assembly, a filtering mechanism, at least three electro-optical modulators, a wavelength division multiplexer and a single photon generating mechanism. The light source assembly is configured to generate a Raman scattering light. The filtering mechanism is configured to pass a light having a specific wavelength, to filter the Raman scattering light and obtain at least three Raman scattering spectral lines. Each electro-optical modulator is configured to modulate a frequency of one of the Raman scattering spectrum lines in one-to-one correspondence, so as to cause a frequency shift of the Raman scattering spectrum line. The wavelength division multiplexer is configured to multiplex all modulated Raman scattering spectral lines and output a Raman optical frequency comb. The single photon generating mechanism is configured to adjust the Raman optical frequency comb to obtain a single-photon Raman optical frequency comb.

First claim

1 . A single-photon Raman optical frequency comb source, comprising:
a light source assembly configured to generate a Raman scattering light; a filtering mechanism configured to pass a light having a specific wavelength, so as to filter the Raman scattering light and obtain at least three Raman scattering spectral lines; at least three electro-optical modulators, wherein each electro-optical modulator is configured to modulate a frequency of one Raman scattering spectrum line of the at least three Raman scattering spectrum lines in one-to-one correspondence, so as to cause a frequency shift of the Raman scattering spectrum line; a wavelength division multiplexer configured to multiplex all modulated Raman scattering spectral lines and output a Raman optical frequency comb; and a single photon generating mechanism configured to adjust the Raman optical frequency comb to obtain a single-photon Raman optical frequency comb.

2 . The single-photon Raman optical frequency comb source according to claim 1 , wherein the light source assembly comprises:
a laser configured to emit a laser; and a gas cavity filled with gas, wherein the laser is incident on gas molecules of the gas and Raman scattering occurs, so as to obtain an initial Raman scattering light; wherein the filtering mechanism is configured to receive a transverse Raman scattering light of the initial Raman scattering light output from the gas cavity, and a transmission direction of the transverse Raman scattering light is perpendicular to a transmission direction of the laser.

3 . The single-photon Raman optical frequency comb source according to claim 2 , wherein determining the light having the specific wavelength comprises:
determining the light having the specific wavelength according to a differential scattering cross section of the gas and an anti-Stokes Raman frequency shift of the gas.

4 . The single-photon Raman optical frequency comb source according to claim 3 , wherein the differential scattering cross section of the gas is expressed by:

(

d
⁢
σ

d
⁢
Ω

)

J

RR
,
VRR

=

112
⁢

π
4

15

⁢

g
⁡
(
J
)

⁢

hcB
0

(

v
0

+

Δ
⁢
v
⁢

(
J
)

)

4

⁢

γ
2

(

2
⁢
I

+
1

)

2

⁢

k
B

⁢
T

⁢
X
⁢

(
J
)

⁢

exp

[

-

E
rot

(
J
)

k
B

⁢
T

]

where J represents a rotational quantum number of the gas molecules, J=2, 3, 4 . . . ,

(

d
⁢
σ

d
⁢
Ω

)

J

RR
,
VRR

 represents a differential scattering cross section of the gas, g(J) represents a nuclear spin statistical weight of the gas molecules, h represents a Planck constant, c represents a speed of light in vacuum, ν 0 represents a wave number of the laser, γ represents an anisotropy parameter of polarization intensity of the gas molecules, I represents a nuclear spin quantum number of the gas molecules, k B represents a Boltzmann constant, T represents a temperature, X(J) represents a rotational transition square matrix, E rot (J) represents a rotational energy of the gas molecules, Δν(J) represents an anti-Stokes frequency shift of the gas, and B 0 represents a rotation constant of the gas molecules,
the anti-Stokes Raman frequency shift of the gas is expressed by:

Δ
⁢
v
⁢

(
J
)

=

2
⁢

Assignees

• Univ Science & Technology China

Inventors

• Wang Chong
• Yang Haocheng
• Xue Xianghui
• Li Yudie
• Chen Tingdi

Classifications

• H01S3/302

  in an optical fibre · CPC title

• H01S3/305

  in a gas · CPC title

• H01S3/115

  using intracavity electro-optic devices · CPC title

• H01S3/1086 Primary

  using scattering effects, e.g. Raman or Brillouin effect · CPC title

• H01S3/0078

  Frequency filtering · CPC title