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VPH (体相全息)衍射光栅
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VPH (体相全息)衍射光栅

体相全息Volume Phase Holographic (VPH) 衍射光栅技术的光谱仪相对于传统的刻划光栅，具有低散射，受偏振影响小的特点，同时牢固耐用，是理想的高端光谱和光通讯仪器、/span>
What are VPH diffraction gratings?

The most commonly used gratings are generally ruled or etched using either a process involving the mechanical scratching of the surface of a substrate or exposure of a photoresist layer deposited on a substrate.where the interference pattern produced by two coherent light beams is used to expose the photoresist. The diffraction gratings produced with this process are often called holographic. Both of these processes are used to create a fine periodic relief pattern on the surface of a blank substrate. Such a relief structure can predictably modify the amplitude and/or phase of the incident light. The superposition of the effects of many such grooves allows for the angular separation of the spectral components of the incident light. Depending on whether the light is reflected from the grooved surface or transmitted through it the grating is called either a reflection or transmission diffraction grating.
A typical VPH grating manufacture process is illustrated below. A layer of photosensitive gel is enclosed by two substrates. Usage of gel between two substrates gives many more degrees of freedom in the spectral response of these gratings. The width shape and depth of the fringes all affect the grating performance.
VPH光栅产品目录

透射式凝胶光栅（Gel Grating），又称体相全息衍射光栅（VPH Grating）， 完全不同于传统的表面凹凸性光栅，凹凸性光栅通过光栅表面的沟槽深度的周期性变化，对光的相位进行调制，从而完成分光，而VPH光栅则通过凝胶层的折射率n的周期性变化对入射光进行调制，完成分光。Wasatch Photonics 通过自己?*及相应的商业保密技术，生产增强型体相全息衍射光栅Enhanced-Volume Phase Holographic Gratings (VPHGs) 及全息光学元 (HOEs). 高性能的光栅可以适合多种应用场合 Dickson Gratings? 光栅是一种专门设计的特殊VPH光栅，具有高色散能力，在偏振S & P都具有高衍射效率，并具有低偏振损耗特点。这种透射型光栅可以使得分光系统更加小巧、结构简化、减少光学元件的使用，设计灵活，制作简单、/p>

光谱范围?50nm?400nm

波前畸变：典型?/4wave，更高精度可定制

波前均匀性：<1>

空间频率?25 lp/mm ?3600lp/mm

Volume Phase Holographic Gratings

  1. These aretheoretical models of transmissiongratings unless stated otherwise.

  2. We have made many of these gratings for customers and measured performance that compares to the theoretical models..

  3. We are happy to make them for you although we do not stock most of these gratings.

黄色的表示为Dickson Gratings?光栅，具有对S& P偏振光具?*衍射效率，并且低PDL（偏振损耗）

灰色的表示对S咋/strong>P偏振光的衍射效率非常匹配

绿色表示寸/strong>S (TE)偏振光具?*衍射效率

浅蓝色表示对P (TM)偏振光具?*衍射效率

紫红色表示低色散光栅(LD-XXX)

? Diffraction Efficiencies: Best Plots

? Assumptions: 5-8% total loss (reflection＋/strong>

absorption & scattering)

 Spatial Frequency (lpmm) CWL or blaze wavelength (nm) Nominal AOI/AOD (degrees) Notes

3600 lpmm at 415nm

Dickson? single pass grating

 3600 415 48.3
3000 l/mm at 360 nm 3000 360 32.68

2730 lpmm at 532 nm

Dickson? single pass grating

 2730 532 46.6
2400 l/mm at 415 nm 2400 415 29.87
2400 lpmm at 532 nm 2400 532 39.67

S polarization

>92%
2400 lpmm at 532 nm 2400 532 39.67
2400 lpmm at 590 nm 2400 590 45.07 Highest Average
2300 lpmm at 532 nm 2300 532 37.7

S polarization

>92%
2300 l/mm at 520 nm 2300 520 36.73
2300 lpmm at 532 nm 2300 532 37.7
2300 lpmm at 605 nm 2300 605 44.09

1850 lpmm at 785 nm

Dickson?single pass grating

 1850 785 46.6

1840 lpmm at 800 nm

Dickson?single pass grating

 1840 800 47.4
1800 l/mm at 532 nm 1800 532 28.6
1800 lpmm at 785 nm 1800 785 44.95

S polarization

>92%
1800 lpmm at 800 nm 1800 800 46.05

1800 lpmm at 800 nm

Quasi-Dickson? single pass grating

 1800 800 46.05
1800 lpmm at 830 nm 1800 830 48.33

1750 lpmm at 830 nm

Dickson? single pass grating

 1750 830 46.6
1700 lpmm at 830 nm 1700 830 44.87

S polarization

>92%
1700 lpmm at 1054 nm 1700 1054 63.6

S polarization

>92%

1670 lpmm at 880 nm

Dickson? single pass grating

 1670 880 47.29

1608 lpmm at 880 nm

Quasi-Dickson? single pass grating

 1608 880 45.0
1500 lpmm at 800 nm 1500 800 36.87
1500 lpmm at 830 nm 1500 830 38.5
1300 l/mm at 560 nm 1300 560 21.35

1245 lpmm at 1185 nm

Dickson? single pass grating

 1245 1185 47.53
1200 lpmm at 500 nm 1200 500 17.46
1200 lpmm at 550nm 1200 550 19.3 P Polarization
1200 lpmm at 600nm 1200 600 21.1
1200 lpmm at 785 nm 1200 785 28.1
1200 lpmm at 800 nm 1200 800 28.68
1200 lpmm at 830 nm 1200 830 29.87
1200 lpmm at 850 nm 1200 850 30.66
1200 lpmm at 920 nm 1200 920 33.5
1200 lpmm at 1032 nm 1200 1032 38.3

S Polarization

>90%
1156 l/mm at 655 nm 1156 655 22.25

1132 l/mm at 610 nm

 1132 610 20.20

1145 lpmm at 1310nm

Dickson?single pass grating

 1145 1310 48.59

1110 lpmm at 1310nm

Dickson?single pass grating

 1110 1310 46.6
1095 lpmm at 700nm 1095 700

P Polarization

>90%
1026 l/mm at 735 nm 1026 735 22.15
940 lpmm at 600nm 940 600 16.4
940 lpmm at 850 nm 940 850 23.55
940 lpmm at 875 nm 940 875 24.28
940 lpmm at 1550 nm

Dickson?double passreflectiongrism

 940 1550 46.761
940 lpmm at 1545 nm

Dickson?double passgrating

 940 1545 46.565

6.4 degrees

per 40 nm
940 lpmm at 1545 nm

Dickson?single pass grating

 940 1545 46.565

3.2 degrees

per 40 nm
940 lpmm at 1510 1545 1590 nm

TunableDickson?single pass grating

 940 C S L Bands varies

~3 degrees

per 40 nm
900 lpmm at 1310 nm 900 1310 36.12
850 l/mm at 885 nm 850 885 22.09
800 lpmm at 480 nm 800 480 11.07
600 lpmm at 1310 nm 600 1310 23.14
600 lpmm at 1550 nm

transmission

 600 1550 27.710
600 lpmm at 560 nm 600 560 9.67

600 lpmm at 600 nm

 600 600 10.37
600 lpmm at 633 nm 600 633 10.95
600 lpmm at 800 nm 600 800 13.89
600 lpmm at 900 nm 600 900 15.66
600 lpmm at 1570 nm 600 1570 28.1
540 lpmm at 740 nm 540 740 11.53
425 lpmm at 650 nm 425 450-850
400 lpmm at 650 nm 400 650 7.470
300 lpmm at 1550 nm

double passreflection

 300 1550 13.44
250 lpmm at 1700 nm 250 1700 12.27
LD-220 lpmm at 550 nm 220 400-700 >35%
LD-155 lpmm at 1325 nm 155 950-1700 >35%
LD-125 lpmm at 550 nm 125 400-700 >35%
LD-118 lpmm at 550 nm 118 450-850 >35%
Capabilities:
Custom Groove Frequencies
Custom Wavelengths
Prism & Mirror Configurations
Various Substrates (e.g. Fused Silica)
AR Coating
Aluminum & Gold Reflection Coating

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