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레이저 분광학

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(1)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

레이저 분광학

(Laser Spectroscopy)

(2)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

분광학

fluorescence / scattering

transmission / absorption incident light

sample

; 광과 물질과의 상호작용의 결과로 나타나는 광의 특성 변화를 분석

(3)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

분광학 정보

- Wavelength : energy levels of atomic system - Line intensity : transition probability

- Natural linewidth : mean lifetime of excited states - Doppler width : velocity distribution (temperature)

- Pressure broadening/shift : collision/interatomic potential - Zeeman / Stark splitting : magnetic/electric moments

λ1 λ2 λ

λ1 λ2

energy level & transition spectrum

(4)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

레이저 분광학의 장점

- High power density : reduce noise, nonlinear spectroscopy - Directionality : multiple pass(sensitive detection)

- Monochromaticity : high spectral resolution - Short pulse laser : transient behavior

레이저 분광학의 응용

- Measurement of Atomic/molecular constants

: Atomic/molecular physics, Condensed matter physics, Biomedical optics, Plasma physics, Isotope separation, Pollution detection, …

- Light-matter interaction

: New spectroscopic technique, Manipulation of photon ÎQuantum optics, Optical information processing, …

(5)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

레이저 분광학

- Doppler-limited absorption and florescence spectroscopy

- Sub-Doppler laser spectroscopy(nonlinear laser spectroscopy) - Time-resolved laser spectroscopy

- Advanced spectroscopy

(6)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Doppler-limited absorption and florescence spectroscopy

- Absorption spectroscopy - Excitation spectroscopy - Photoacoustic spectroscopy - Optogalvanic spectroscopy - Ionization spectroscopy

- Laser magnetic resonance/Stark spectroscopy, - Multiphoton spectroscopy, …

(7)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Absorption spectroscopy

(8)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Excitation spectroscopy

(9)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Photoacoustic spectroscopy

(10)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Optogalvanic spectroscopy

(11)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Ionization spectroscopy

(12)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Sub-Doppler laser spectroscopy

- Saturation spectroscopy - Polarization spectroscopy - Multiphoton spectroscopy, …

(13)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Saturation spectroscopy

(14)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

LD

BK-7

bare glass M

variable attenuator

λ/2 or λ/4 wave plate

BK-7

bare glass Helmholtz

coils(3-pairs)

B/S

-

+

photodiode

data acquisition 852 nm

example

(15)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

0 100 200 300 400 500 600

(d) (c)

(a) (3,2) (3,3) (3,4)

(b)

relative frequency [MHz]

0 100 200 300 400 500 600

(d)

relative frequency [MHz]

(c) (b)

(4,5) (4,4)

(4,3)

(a)

F=4 -> 3, 4, 5

lin||lin

lin lin

F=3 -> 2, 3, 4

σ+σ+ σ+σ-

(16)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Polarization spectroscopy

(17)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Multiphoton spectroscopy

(18)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Time-resolved laser spectroscopy

fs Ti:sapphire laser system

Mode-locked pulse

(19)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Pump-probe spectrum of InGaAs Nano structure processing

(20)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Advanced spectroscopy

- EIT(electromagnetically induced transparency) - Laser cooling

(21)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

EIT(electromagnetically induced transparency)

- Optical pulse manipulation

- Quantum information processing - Nonlinear optics

- Single photon switching

(22)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

빛을 멈추다

CQCC B.S. Ham

Nature 409, 461 (2001)

1. In cold atoms, C. Liu et al.,

Nature 409, 490 (2001)

2. In atomic vapors, D. Philips et al., PRL 86, 783 (2001)

3. In solids,

A. Turukhin et al.,

PRL 88, 023602 (2002) 빛 멈춤 실험관측

(23)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Laser cooling

- High resolution spectroscopy - BEC

- Atomic optics / interferometry - Atomic layer deposition

(24)

Nonlinear Optics Lab

Nonlinear Optics Lab.

.

HanyangHanyang Univ.Univ.

Bose-Einstein Condensation

A series of 140 overlapping pulses form a continuous, well-collimated atom laser beam. (6 cm/s)

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