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Mid-Infrared Light Sources Based on Difference Frequency Generation in Direct-Bonded Periodically-Poled LiNbO 3 Ridge W PowerPoint Presentation
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MIOMD-Ⅶ, Lancaster, Sep. 11-14 Mid-Infrared Light Sources Based on Difference Frequency Generation in Direct-Bonded Periodically-Poled LiNbO 3 Ridge Waveguides H. Suzuki , O. Tadanaga, T. Yanagawa, Y. Nishida H. Miyazawa, K. Magari and M. Asobe NTT Photonics Laboratories NTT Corporation

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slide1

MIOMD-Ⅶ, Lancaster, Sep. 11-14

Mid-Infrared Light Sources Based on Difference Frequency Generationin Direct-Bonded Periodically-Poled LiNbO3 Ridge Waveguides

H. Suzuki, O. Tadanaga, T. Yanagawa, Y. Nishida

H. Miyazawa, K. Magari and M. Asobe

NTT Photonics Laboratories

NTT Corporation

(hiroyuki@aecl.ntt.co.jp)

outline
Outline
  • Background

Key device: High-efficiency PPLN waveguides

  • Application to visible laser sources
  • Characteristics of mid-IR DFG light sources in the 2-3mm regions
  • Demonstration of gas absorption measurements
  • Future plan
slide3

420 GHz

20

0

Signals

Pump

-20

Converted

signals

-40

20

20

pump

0

10

SH pump (0.78 mm)

Converted

signal

840 GHz

signal

converted signal

0

Pump

-20

Intensity (dBm)

-1.3 dB

-10

-40

Signal

Intensity (dBm)

20

-20

0

-30

-20

-40

-40

-50

1.53

1.54

1.55

1.56

20

Wavelength (mm)

0

-20

-40

1540

1550

1560

1570

1580

1590

1600

Wavelength (nm)

High-efficiency wavelength converter

for WDM applications

Device structure

0-dB DWDM signal conversion

40Gb/sx8ch conversion by multi-PPLN WC

Telecom applications ⇒ Non-telecom applications

construction of laser light sources
Construction of laser light sources

Telecom LD1

l3 generation by SFG

or DFG in PPLN WG

Telecom LD2

PPLN WG

Desired laser light generation from selectedλ1 &λ2

Sum-frequency generation (SFG) @ visible

Difference-frequency generation (DFG) @ mid-IR

560 590 nm light sources using sum frequency generation

120

100

Noise: 0.35%(Peak to Peak)

80

0.06%(Root Mean Square)

60

Output (%)

40

20

0

0

20

40

60

80

100

m

s)

Time (

560-590 nm light sourcesusing sum-frequency generation

Output wavelength:

560nm: 0.98mm+1.3mm

590nm: 1.06mm+1.3mm

  • Output power
  • >10mW for CW
  • >5mW for direct modulation
  • Direct modulation capability
  • Low noise
slide6

DFG wavelength (mm)

Signal wavelength (mm)

Mid-infrared DFG light source

based on PPLN waveguide

  • Telecom LD pumped
  • mid-IR light generation
  • between 2 and 5 mm
  • >RT CW operation
  • Widely tunable
  • @ 2.3-mm range
slide8

Direct bonded ridge waveguide

Zn-doped or non-doped

LN substrate

Diamond blade

Electrical poling

Polarization

Direct bonding

Bonded LN/LT wafer

LT or Mg-doped LN substrate

<10 mm

Lapping and polishing

Waveguide fabrication using dicing saw

Photograph of waveguide cross-section

・ High damage resistance    ・ Long-term reliability

・ High conversion efficiency ・ Precise design

dfg characteristics of 3 m m band waveguide
DFG characteristics of3-mm band waveguide

DFG tuning curve

L= 28.4 mm

L=50 mm

RT

Pump: Nd:YLF ~10 mW

Signal: Tunable LD ~1 mW

Conversion efficiency: 40 %/W

Output: 0.26-mW with 11-mW pump and 66-mW signal

slide10

Lock in Amp.

Lock in Amp.

1.55mm

Signal:

EDFA

PbSe

Tunable

LD

Chopper

Vacuum cell

1.06mm

QPM-LN WG

Pump:

CH4 cell

Coupler

PbSe

LD

FBG

BS (Si)

Lens

L= 28.4mm

Ge filter

CH4 (@ 3.3 mm) detection setup

slide11

CH4 absorption spectrum

CH4 gas cell:

10 Torr, 20cm

(CaF2 windows)

Reference cell:

10-5 Torr, 20cm

(CaF2 windows)

broad band phase matching @ 2 3 m m

L: Poling pitch

Phase-matching: Dk = 0

ne(lp)

lp

1

L

ne(li)

li

ne(ls)

ls

-

-

-

Dk = 2p

Phase mismatch Dk (mm-1)

lp

Broad-band phase-matching@ 2.3 mm

lp~ 0.94 mm

Wide tuning range

@ 2.3 mm

simulated dfg characteristics in a 5 cm long bulk sample
Simulated DFG characteristicsin a 5 cm-long bulk sample

Idler Wavelength [nm]

2800

2600

2400

2200

2000

25

46℃

48℃

20

50℃

52℃

15

54℃

56℃

DFG Output [nW]

58℃

10

60℃

5

0

1400

1500

1600

1700

1800

1900

Signal Wavelength [nm]

dfg tuning curve
DFG tuning curve

Pump power: 17.5mW

Signal wavelength: 1580.0 nm

~100 %/W

DFG characteristics of

fabricated 2mm-band waveguide

Signal power vs Output power

L= 25.60 mm

L=50 mm

RT

3-dB bandwidth @ RT: ~100 nm

Conversion efficiency: ~100 %/W

Output: >0.4 mW

slide15

Lock in Amp.

Lock in Amp.

1.55 mm

Signal:

Tunable

LD

PbSe

Chopper

Reference

0.94 mm

QPM-LN WG

Pump:

CO cell

LD

Coupler

FBG

BS (Ge)

Lens

PbSe

L = 25.60 mm

Ge filter

CO (@ 2.4 mm) detection setup

slide16

CO isotopomer absorption spectrum

12CO / buffer gas cell:

300 Torr, 20cm

(anhydros SiO2 windows)

13CO / buffer gas cell:

300 Torr, 20cm

(anhydros SiO2 windows)

12CO (100Torr)

13CO (100Torr)

Reference gas cell:

300 Torr, 40cm

slide17

CO ro-vibration absorption spectra

12CO (100 Torr, 20cm)

13CO (100 Torr, 20cm)

slide18

Assignment of

12CO ro-vibration absorption lines

P-branch

R-branch

slide20

16

14

22

15

3

2

9

21

18

13

4

11

20

6

1

10

17

0

19

12

8

7

5

ppm-level CO2 detection in air

@ 2.7 mm

4 ppm

Multi-pass cell

Pump laser @ 0.98 mm

mid ir ppln waveguide module
Mid-IR PPLN waveguide module

PPLN waveguide module

PPLN waveguide

summary
Summary
  • Laser diode pumped mid-IR light sources

using DFG in direct bonded PPLN waveguide.

  • Mid-IR light generated in the 2- and 3-mm regions.

Conversion efficiency: 40–100 %/W.

Output: mW level

  • Absorption measurements demonstrated

for CH4, CO isotomomers and CO2.

  • Mid-IR PPLN waveguide being developed.