raman excited spin coherences in nv centers in diamond n.
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Raman-excited spin coherences in NV centers in diamond. Maria Simanovskaia. Experiments. Non-degenerate four wave mixing Electromagnetically induced transparency. Non-degenerate four wave mixing.

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Presentation Transcript
experiments
Experiments
  • Non-degenerate four wave mixing
  • Electromagnetically induced transparency
non degenerate four wave mixing
Non-degenerate four wave mixing
  • NV diamond sample has ~30 ppm color centers, has peak optical density of ~0.6 for 1 W/cm2 probe intensity at 15 K
  • Used one dye laser, with acousto-optic frequency shifters
    • Downshifted R1, R2, P from original frequency by 400, 280, and 420 MHz, respectively
    • Intensities of R1, R2, P and repump beam were 1.2, 1.6, 5.6, 10 W/cm2

20 MHz

R1

P

R2

D

S = −1

120 MHz

S = 0

fine structure

20 MHz

R1

P

R2

D

S = −1

120 MHz

S = 0

S = ±1

120 MHz

2.88 GHz

S = 0

B-field

0 G

1050 G

Fine structure
  • Sublevel splitting due to external magnetic field

S = +1

S = −1

non degenerate four wave mixing1
Non-degenerate four wave mixing
  • 3.5° intersection angle
    • To complete equivalence: kD = kR2 − kR1 + kP
  • 514.5 nm argon laser used as a repump
    • Protect against spectral hole burning
  • Helmholtz coils
  • Laser beams: linearly polarized, focused by 150-mm focal length lens
  • 15 K maintained by Janis helium-flow cryostat

Detector

Dye laser

Optics

results ndfwm
Results: NDFWM
  • Narrow linewidth is taken as

evidence of Raman process

    • Homogeneous width of optical

transition (~50 MHz)

    • Inhomogeneous width of spin transition (5 MHz)
  • Recall: for NDFWM, intensities of R1, R2, P and repump beam were 1.2, 1.6, 5.6, 10 W/cm2
  • Saturation intensities are

36 W/cm2 and 56 W/cm2 for

optical transitions resonant

with R1 and R2, respectively

electromagnetically induced transparency
Electromagnetically induced transparency
  • Lambda EIT scheme
  • Used R2, R1 and repump beams

R2, no diamond

R2, with diamond

R2, with diamond and R1

Probe: R2,

1 W/cm2

Coupling: R1,

280 W/cm2

% Transmission

% Transmission

% Transmission

S = −1

120 MHz

Freq.

Freq.

120 MHz

120 MHz

120 MHz

Freq.

S = 0

difference

difference

difference

results eit
Results: EIT
  • Max value of transparency is 17% of background absorption
    • 70% of what is possible (random orientation of NV center in diamond)
  • EIT linewidth is substantially

smaller than laser jitter

(~100 MHz) and the

optical homogeneous

linewidth