KTP 結晶　非線形光学結晶 (NLO)

KTP 結晶 Potassium Titanyl Phosphate (KTiOPO4,KTP)

KTP結晶

KTP 結晶　Potassium Titanyl Phosphate (KTiOPO3 or KTP)は商用レーザー、軍事用レーザー双方に広く使用されており、研究室での実験、医療システム、レンジファインダー、ライダー、通信、産業機器等多岐に渡ります。

 KTP 非線形光学結晶は数量１つから販売しております。
KTP 非線形光学結晶ご購入の際は、ご希望のサイズ　ご希望のコーティング　数量をお知らせください。

KTP 結晶の特徴

  • 大きな非線形光学係数を持ちます。
  • 大きな受け入れ角度の幅を持ち小さなウォークオフアングルを持ちます。
  • お使いいただける温度範囲が広く、波長帯も広いです。
  • 高い電気光学係数を持ち低い比誘電率が特徴です。
  • 吸湿性が無く、化学的にも安定しています。

 

KTP 結晶におけるCASTECH社のサービス 

  • KTP結晶製造には厳格な品質管理を行っております。 
  • KTP結晶の供給可能な最大サイズは20x20x40mm3 、最長 60mmが可能です。
  • 短納期・迅速な納品を致します
  • 低価格で販売しております。
  • ARコーティング・マウント・再研磨サービスを行っています。

 KTP 結晶の化学特性と構造特性

Crystal Structure

Orthorhombic, space group Pna21,point group mm2

Lattice Parameter

a=6.404?, b=10.616?, c=12.814?, Z=8

Melting Point   

About 1172°C

Mohs Hardness   

5

Density         

3.01 g/cm3

Thermal Conductivity  

13W/m/K

Thermal Expansion Coefficient

αx=11×10-6/°C, αy=9×10-6/°C, αz=0.6×10-6/°C

 KTP 結晶の光学特性及び非線形特性

Transparency Range

350～4500nm

SHG Phase Matchable Range

497～1800nm  (Type II)

Therm-optic Coefficients
(/°C)

dnx/dT=1.1X10-5
dny/dT=1.3X10-5
dnz/dT=1.6X10-5

Absorption  Coefficients

<0.1%/cm at 1064nm    <1%/cm at 532nm

For Type II SHG of a Nd:YAG laser at 1064nm

 

 

Temperature Acceptance: 24°C-cm
Spectral Acceptance: 0.56nm-cm
Angular Acceptance: 14.2mrad-cm (φ);55.3mrad-cm (θ)
Walk-off Angle: 0.55°

NLO Coefficients

deff(II)≈(d24-d15)sin2φsin2θ-(d15sin2φ + d24cos2φ)sinθ

Non-vanished NLO susceptibilities

d31=6.5 pm/V    d24=7.6 pm/V
d32=5 pm/V        d15=6.1 pm/V
d33=13.7 pm/V

Sellmeier  Equations
(λ in μm)     

nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ 2
ny2=3.0333+0.04154/(λ 2-0.04547)-0.01408λ2
nz2=3.3134+0.05694/(λ 2-0.05658)-0.01682λ2

KTP 結晶の応用：NdドープレーザーのSHG（二倍波発生）と SFG（和周波発生）

KTP is the most commonly used material for frequency doubling of Nd:YAG and other Nd-doped lasers, particularly when the power density is at a low or medium level. To date, extra- and intra-cavity frequency doubled Nd:lasers using KTP have become a preferred pumping source for visible dye lasers and tunable Ti:Sapphire lasers as well as their amplifiers. They are also useful green sources for many research and industry applications.

 

* More than 80% conversion efficiency and 700mJ green laser were obtained with a 900mJ
   injection-seeded Q-switch Nd:YAG lasers by using extra-cavity KTP.
* 8W green laser was generated from a 15W LD pumped Nd:YVO4 with intra-cavity KTP.
* 200mW green outputs are generated from 1 W LD pumped Nd:YVO4 lasers by        using CASTECH ’s 2x2x5mm KTP and 3x3x1mm Nd:YVO4.
* 2-5mw green outputs are generated from 180mw LD pumped Nd:YVO4 and KTP glued    crystals.For more details, please refer to Glued Crystals.

KTP is also being used for intracavity mixing of 0.81μm diode and 1.064μm Nd:YAG laser to generate blue light and intracavity SHG of Nd:YAG or Nd:YAP lasers at 1.3μm to produce red light.

 

KTP 結晶の応用：OPG、 OPA、  OPOについて 

As an efficient OPO crystal pumped by a Nd:laser and its second harmonics, KTP plays an important role for parametric sources for tunable outputs from visible (600nm) to mid-IR (4500nm), as shown in Fig. 3 and Fig. 4.

Generally, KTP’s OPOs provide stable and continuous pulse outputs (signal and idler) in fs, with 108 Hz repetition rate and a mW average power level. A KTP’s OPO that are pumped by a 1064nm Nd:YAG laser has generated as high as above 66% efficiency for degenerately converting to 2120nm.

The novel developed application is the non-critical phase-matched(NCPM) KTP OPO/OPA pumped by the X-cut KTP crystal. As shown in Fig.5, for pumping wavelength range from 0.7μm to 1 μm, the output can cover from 1.04μm to 1.45μm(signal) and from 2.15μm to 3.2μm(idler). More than 45% conversion efficiency was obtained with narrow output bandwidth and good beam quality.

KTP 結晶の応用： E-Oデバイスについて

In addition to unique NLO features, KTP also has promising E-O and dielectric properties that are comparable to LiNbO3These advantaged properties make KTP extremely useful to various E-O devices. Table 1 is a comparison of KTP with other E-O modulator materials commonly used:

Electro-Optic モジュレーターに使用されるマテリアル比較表 

 

 

 

   

Phase

 

 

Amplitude

 

Material

ε

N

R(pm/V)

k(10-6/°C)

N7r2/ε(pm/V)2

r(pm/V)

k(10-6/°C)

n7r2/ε(pm/V)2

KTP

LiNbO3

KD*P

LiIO3

15.42  

27.9

48.0

5.9

1.80

2.20

1.47

1.74

35.0

 8.8

24.0

6.4

31

82

9

24

6130

7410

178

335

27.0

20.1

24.0

1.2

   11.7

   42

    8

   15

3650

3500

178

124

 

From Table 1, clearly, KTP is expected to replace LiNbO3 crystal in the considerable volume application of E-O modulators, when other merits of KTP are combined into account, such as high damage threshold, wide optical bandwidth (>15GHZ), thermal and mechanical stability, and low loss, etc.

KTP 結晶の応用：Optical Waveguides 

Based on the ion-exchange process on KTP substrate, low loss optical waveguides developed for KTP have created novel applications in integrated optics. Table 2 gives a comparison of KTP with other optical waveguide materials. Recently, a type II SHG conversion efficiency of 20%/W/cm2 was achieved by the balanced phase matching, in which the phase mismatch from one section was balanced against a phase mismatch in the opposite sign from the second. Furthermore, segmented KTP waveguides have been applied to the type I quasi-phase-matchable SHG of a tunable Ti:Sapphire laser in the range of 760-960mm, and directly doubled diode lasers for the 400-430nm outputs.

 

Electro-Optic Waveguideの素材比較表

Materials

r (pm/V)

n

eeff (e11e33)1/2

n3r/eeff (pm/V)

KTP

LiNbO3

KNbO3

BNN

BN

GaAs

BaTiO3

35

29

25

56

56-1340

1.2

28

1.86

2.20

2.17

2.22

2.22

3.6

2.36

13

37

30

86

119-3400

14

373

17.3

8.3

9.2

7.1

5.1-0.14

4.0

1.0

KTP 結晶に施すことが出来るARコーティング

CASTECH provides the following AR-coatings:

  •  Dual Band AR-coating (DBAR) of KTP for SHG of 1064nm.
  •          low reflectance (R<0.2% at 1064nm and R<0.5% at 532nm );
  •          high damage threshold (>300MW/cm2 at both wavelengths);
  •          long durability.
  •  Broad Band AR-coating (BBAR) of KTP for OPO applications.
  •  High reflectivity coating: HR1064nm&HT532nm, R>99.8%@1064nm, T>90%@532nm.
  •  Other coatings are available upon request.

KTP 結晶の仕様及び保証について

  •  Dimension tolerance: (W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm) (L≥2.5mm)
  •                                               (W±0.1mm)x(H±0.1mm)x(L+0.1/-0.1mm) (L<2.5mm)
  •  Clear aperture: central 90% of the diameter
  •  No visible scattering paths or centers when inspected by a 50mW green laser
  •  Flatness: less than λ/8 @ 633nm
  •  Transmitting wavefront distortion: less than λ/8 @ 633nm
  •  Chamfer: ≤0.2mm@45°
  •  Chip: ≤0.1mm
  •  Scratch/Dig code: better than 10/ 5 to MIL-PRF-13830B
  •  Parallelism: better than 20 arc seconds
  •  Perpendicularity: ≤5 arc minutes
  •  Angle tolerance: Δθ≤0.25°, Δφ≤0.25°
  •  Damage threshold[GW/cm ]: >0.5 for 1064nm, TEM00, 10ns, 10HZ (AR-coated)
  •                                                         >0.3 for 532nm, TEM00, 10ns, 10HZ (AR-coated)
  •  Quality Warranty Period: one half year under proper use.
KTP 非線形光学結晶は数量１つから販売しております。
KTP 非線形光学結晶ご購入の際は、ご希望のサイズ　ご希望のコーティング　数量をお知らせください。

価格・納期等弊社営業部よりご回答申し上げますのでお気軽にお問い合わせください。

最終更新日2014年11月22日