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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。 |
| 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 通过自己的**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) 及全息光学元件 (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。 光谱范围：350nm—2400nm 波前畸变：典型值1/4wave，更高精度可定制 波前均匀性：<1> 空间频率：125 lp/mm —-3600lp/mm |
Volume Phase Holographic Gratings
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黄色的表示为Dickson Gratings®光栅，具有对S& P偏振光具有**衍射效率，并且低PDL（偏振损耗） | ||||
灰色的表示对S和P偏振光的衍射效率非常匹配 | ||||
绿色表示对S (TE) 偏振光具有**衍射效率 | ||||
浅蓝色表示对P (TM) 偏振光具有**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， 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 pass reflection grism | 940 | 1550 | 46.761 | |
| 940 lpmm at 1545 nm Dickson®double pass grating | 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 Tunable Dickson® 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 pass reflection | 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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