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ZnS多光譜窗片

ZnS多光譜（透明）用于紅外窗口和熱波段（8至14μm）透鏡，特別是需要更大透射和更低吸收率的窗口。 選擇用于可見對準(zhǔn)也是有利的。硫化鋅通過從鋅蒸汽和H 2 S氣體合成而產(chǎn)生，經(jīng)過壓片形成片狀。硫化鋅在結(jié)構(gòu)上是微晶的，控制晶粒尺寸以產(chǎn)生zui大強(qiáng)度。 多光譜等級然后是熱等靜壓（HIP），以改善中紅外透射和產(chǎn)生視覺上清楚的形式。 單晶ZnS是可用的，但不常見。在其常用光譜范圍內(nèi), 散射很低。在用做高功率激光器件時, 需要嚴(yán)格控制材料的體吸收和內(nèi)部結(jié)構(gòu)缺陷, 并采用極小破壞程度的拋光技術(shù)和高光學(xué)質(zhì)量的鍍膜工藝。ZnS在300℃下顯著氧化，在約500℃下顯示塑性變形，并解離約700℃。 為了安全起見，在正常大氣中不應(yīng)在250°C以上使用硫化鋅窗戶。

技術(shù)參數(shù)：

透射范圍：

0.3713.5μm

折射率：

2.20084  at 10μm

反射損耗：

24.7％ at 10μm（2個表面）

吸收系數(shù)：

0.0006cm -1 at 3.8μm

吸收峰：

30.5μm

dn / dT：

+ 38.7×10 -6 /℃，3.39μm

dn /dμ：

n / a

密度：

4.09g / cc

熔點(diǎn)：

1827°C

熱導(dǎo)率：

27.2W m-1 K-1  at 298K

熱膨脹：

6.5×10-6 /℃ at 273K

硬度：

Knoop 160  with 50g indenter

比熱容量：

515JKg-1K-1

介電常數(shù)：

88

楊氏模量（E）：

74.5GPa

剪切模量（G）：

n / a

體積模量（K）：

n / a

彈性系數(shù)：

not available

表觀彈性極限：

68.9MPa（10,000psi）

泊松比：

0.28

溶解度：

65×10-6g / 100g  water

分子量：

97.43

類/結(jié)構(gòu)：

HIP多晶立方，ZnS，F42m

光譜透射曲線：

折射率：（No = Ordinary Ray）

um

No

um

No

um

No

0.4047

2.54515

0.4358

2.48918

0.4678

2.44915

0.480

2.43691

0.5086

2.41279

0.5461

2.38838

0.5876

2.36789

0.6438

2.34731

0.6678

2.34033

0.7065

2.33073

0.780

2.31669

0.7948

2.31438

0.8521

2.30659

0.8943

2.30183

1.014

2.29165

1.1287

2.28485

1.5296

2.27191

2.0581

2.26442

3.000

2.25772

3.500

2.25498

4.000

2.25231

4.500

2.24955

5.000

2.24661

8.000

2.22334

9.000

2.22334

10.00

2.20084

11.25

2.18317

12.00

2.17101

13.00

2.15252

 

 

ZnS多光譜（透明）圓形窗片：

訂購信息：

訂購型號

規(guī)格

應(yīng)用光譜

ZNSP10-1

10.0×1.0mm

IR

ZNSP12-1

12.0×1.0mm

IR

ZNSP13-1

13.0×1.0mm

IR

ZNSP13-2

13.0×2.0mm

IR

ZNSP15X2

15.0×2.0mm

IR

ZNSP19-1W

19.0×1.0mm

IR

ZNSP25-1

25.0×1.0mm

IR

 ZNSP25-2

25.0×2.0mm

IR

ZnS多光譜（透明）矩形窗片：

訂購信息：

訂購型號

規(guī)格

應(yīng)用光譜

ZNSP10-10-3

10.0×10.0×3.0mm

IR
關(guān)于晶體切割：

During Chemical Vapour Deposition the small crystallite grains align with the direction of growth, and are normal to the thickness of the sheet produced. For windows of normal thickness and aspect ratios the alignment of the grain therefore is rarely a problem as they are cut from the grown sheet such that within an optical window the grains align perpendicular to the surfaces. This is optimum orientation for lowest internal absorption and scatter.

With prisms, the cutting direction requires more consideration. It is recommended that the thickness of the strip material corresponds to the apex height of the prism. This ensures optimum crystallite orientation for most usual prism applications.

For typical 45° prisms the most obvious use of material is shown in (A) but it should be noted that this is not the optimum orientation.

The best choice is (B) and it also permits a higher limit on prism size or conversely allows thinner stock to be used. There is waste at the ends of the strip but this is small and so it may not be quite as economic as (A).

Cutting in direction (C) where the entire light beam runs at 90° to the grain

structure should be avoided completely if at all possible. Note that maximum available thickness of ZnSe and ZnS (FLIR) is approximately 60mm. Maximum available thickness of ZnS Cleartran is approximately 30mm.