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BBO(β相偏硼酸钡晶体)

文章出处:网络整理 浏览次数:发表时间:2021-12-31 15:17

BBO晶体是一种新型的紫外倍频晶体,具有较大的相位匹配范围以及较宽的透过波段,其倍频转换效率比较高,并具有很高的激光损伤阈值。应用:激光倍频、光参量放大、电光调Q等。由于BBO具有较低的潮解性,我们使用了一种有效的保护镀膜(P-coating)来防止晶体受潮。

Advantages of BBO Crystals

Broad phase-matching range from 409.6 nm to 3500 nm

Wide optical transmission from 190 nm to 3500 nm

Large effective second-harmonic-generation (SHG) coefficient

High damage threshold of 10 GW/cm2 for 100 ps pulse-width at 1064 nm

Wide temperature-bandwidth of about 55℃

Good mechinical and physical properties

Capabilities:

Aperture:

 

2x2 ~ 25x25mm

 

Lenght:

 

0.01 - 25mm

 

Cutting Angle of BBO Crystals

And:

 

Determined by different kinds of homonic generartion

 

Phase matching type:

 

Type I or Type II

 

End Configuration:

 

Plano/Plano or Brewst/Brewst or Specified

 

Specifications of BBO Crystals

Angle tolerance:

 

Δθ< ± 0.5°; Δφ< ±0.5°

 

Dimensional Tolerance:

 

(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)

 

Flatness:

 

<λ/8 at 633nm

 

Surface Quality:

 

10/5 S/D

 

Parallelism:

 

< 20 arc seconds

 

Perpendicularity:

 

< 5 arc minutes

 

Wavefront Distortion:

 

<λ/8 at 632.8nm

 

Clear Aperture:

 

Central 95%

 

Chamfer:

 

0.15x45°

 

Coating:

 

* Protective coating is required to prevent polished surfaces from fogging.
* Anti-reflective coating should be considered if low reflectivity is required.

 

Properties of BBO Crystal:

Sellmeier Equations:

no2(l) = 2.7359+0.01878/(l2-0.01822)-0.01354 l2
ne2(l) = 2.3753+0.01224/(l2-0.01667)-0.01516 l2


BBO optical properties:

Transparence range: 189-3500nm


Second harmonic generation (SHG) range: 410-2400nm
Type I phase matching plane: X-Z plane, f=0o
Type I phase matching plane: X-Z plane, f=30o

The c, , , , , rystals , , , , , , , with different angle cut for various applications are listed as follows:

1) Harmonic generations of Nd:YAG lasers:


1064nm SHG --> 532nm: 4x4x7mm Type I , q=22.8??, f=0o;
1064nm THG --> 355nm: 4x4x7mm Type I, q=31.3o, f=0o; Type II q=38.6o, f=30o
1064nm 4HG --> 266nm: 4x4x7mm Type I, q=47.6o, f=0o;
1064nm 5HG --> 213nm: 4x4x7mm Type I, q=51.1o, f=0o;

2) OPO and OPA pumped by harmonics of Nd:YAG lasers


532nm Pump --> 680-2600nm: 8x6x12mm Type I, q=21o, f=0o;
355nm Pump --> 410-2600nm: 8x6x12mm Type I, q=30o, f=0o; Type II, q=37o, f=30o;
266nm Pump --> 295-2600nm: 8x6x12mm Type I, q=39o, f=0o;

3) Frequency doubling of dye lasers


670-530nm SHG --> 335-260nm: 8x4x7mm Type I, q=40o, f=0o;
600-440nm SHG --> 300-220nm: 8x4x7mm Type I, q=55o, f=0o;
444-410nm SHG --> 222-205nm: 8x4x7mm Type I, q=80o, f=0o;

4) Harmonic generations of Ti:Sapphire lasers


700-1000nm SHG --> 350-500nm: 5x5x0.2mm Type I, q=28o, f=0o;
700-1000nm THG --> 240-330nm: 5x5x0.2mm Type I, q=42o, f=0o;
700-1000nm FHG --> 210-240nm: 5x5x0.2mm Type I, q=66o, f=0o;

5) Frequency doubling and tripling of alexandrite lasers


720-800nm SHG --> 360-400nm: 6x4x7mm Type I, q=31o, f=0o;
720-800nm THG --> 240-265nm: 6x4x7mm Type I, q=48o, f=0o;

6) Intracavity SHG of Ar+ laser with brewster angle cut BBO


514nm SHG --> 257nm: 4x4x7mm Type I, q=51o, f=0o, B-cut;
488nm SHG --> 244nm: 4x4x7mm Type I, q=55o, f=0o, B-cut;

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