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高温相BBO(alpha-BBO, a-BBO)是一种负单轴晶体，在189nm到3500nm的宽透明范围内具有大的双折射。α-BBO晶体的物理、化学、热和光学性质与低温相β-BBO晶体相似。然而，由于晶体结构的中心对称，在α-BBO晶体中不存在二阶非线性效应，因此它不适用二阶非线性光学过程。相反，alpha-BBO被广泛用于制造偏振器，偏振束位移器、相位延迟器、双折射板以及延迟补偿器，特别是那些用于UV和高功率激光器。alpha-BBO晶体楔形/棱镜也可提供。如下是双折射的alpha-BBO板或块。alpha-BBO晶体制造偏振光学，请参考偏振类--偏振光学部分。
1） 基本参数
Wavefront distortion | less than λ/8@633nm |
Clear aperture | > 90% central area |
Flatness | λ/4@633nm |
Surface quality | 20/10 Scratch/Dig per MIL-O-13830A |
Parallelism | better than 30 arc seconds |
Perpendicularity | 10 arc minutes |
Angle tolerance | Δθ < 0.25°, Δφ < 0.25° |
2） 订购举例
Item | Description |
1 | a-BBO, 5x5x0.05mm, a-cut, with protective coating (P-coating), mounted in OD 1" holder（厚度0.1/0.2mm可选） |
2 | a-BBO, 5x5x0.33mm, a-cut, AR@800/400nm, mounted in OD 1" holder（1mm厚度可选） |
3 | a-BBO, 12.7x12.7x0.1mm, a-cut, with protective coating (P-coating), mounted in OD 1" holder（0.2/0.5/1/2/3/5mm厚度可选） |
4 | a-BBO, 12.7x12.7x0.2mm, a-cut, with protective coating (P-coating), mounted in OD 1" holder |
5 | A-BBO, 12.7x12.7x0.2mm, a-cut, AR@1040/520nm, mounted in OD 1" holder（1/2mm厚度可选） |
6 | a-BBO, 12.7x12.7x1.0mm, a-cut, AR@800/400nm, mounted in OD 1" holder |
7 | a-BBO, 12.7x12.7x2.0mm, a-cut, BBAR@800/400nm, mounted in OD 1" holder |
8 | a-BBO, 22.0x22.0x2.0mm, a-cut, AR@ 800/400nm, mounted in OD 2" holder |
9 | a-BBO, 40.0x40.0x8.0mm, a-cut, P-coating, Mounted (TBD) |
10 | a-BBO, 5x5x10.0mm, a-cut, with protective coating (P-coating), mounted in OD 1" holder |
11 | a-BBO, 5x5x10.0mm, 45 deg-cut, with protective coating (P-coating), mounted in OD 1" holder |
12 | a-BBO, 10x10x13.3mm, 45 deg-cut, AR@1550/775nm, mounted in OD 1" holder |
13 | a-BBO, 15x15x20.0mm, a-cut, with protective coating (P-coating), mounted in OD 1" holder |
14 | a-BBO, 3x3x20.0mm, a-cut, AR coated @795/398nm, UNMOUNTED |
15 | a-BBO, 25x25x20.0mm, a-cut, with protective coating (P-coating), mounted in OD 2" holder or unmounted |
