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"N-Grade EX"
Features
■Ultra High Purity
This is an ultra high purity optical synthetic quartz crystal manufactured using high purity materials with thorough quality control in optimized growing conditions. With the impurity concentration, linear defect density, and inclusion density in crystals minimized to the utmost limit, this is an ultra high purity product graded as top class in all categories of the "JIS C 6704" synthetic quartz crystal quality standard. Due to its extremely high purity, it is possible to bring out the natural characteristics of the quartz crystal to the utmost limit. Effect of maintaining high resistance and high transmittance for high output and short wavelength lasers, low defect generation effects against irradiation, and excellent characteristics as optical components for use in space and in radiation environments, and as high-stability crystal units can be expected from this synthetic quartz crystal.
The grade table for N-Grade EX and standard products (comparison) is shown in Table 1. Compared to standard products, the impurity content is extremely low.
The infrared transmittance characteristics of N-Grade EX are shown in Figure 2. Compared to standard products, there is very little absorption at 3585 cm-1, which indicates the presence of impurity OH groups typical of quartz crystals.
[Table 1: Grade table for N-Grade EX and regular products (comparison)]
![[Table 1: Grade table for N-Grade EX and regular products (comparison)]](../../upload/crystal/products/crystal_n-grade-ex_img02.png)
Remark）
- 1）Indicates the maximum effective block size. We can process and deliver it to the specified size and thickness. Please specify.
- 2）Inclusion density complies with JIS-C 6704. Ⅰa grade is the product with the fewest optical inclusions.
- 3）The infrared absorption coefficient a value complies with JIS-C 6704. Standardized by the absorption coefficient of hydroxyl group-OH.
- 4）This is an example of quantitative analysis by ICP-MS. We do not guarantee the amount of impurities. It is possible to analyze and attach each gemstone upon request, but in that case an analysis fee will be charged separately.
- 5）Artificial quartz has a phase transition temperature of 573 ℃. Please use below this temperature.
[Figure 2: Comparison of measurements of infrared absorption characteristics of N-Grade EX and standard products]
N-Grade EX
Standard products
Measuring Device：IR-700 Infrared Spectrophotometer made by JASCO Corporation *Q-values are for reference only.
■High Transmittance Characteristics
A comparison of transmittance in the vacuum ultraviolet region by quality grade is shown in Figure 3. N-Grade EX maintains high transmittance up to near the absorption edge in the vacuum ultraviolet region.
On the other hand, the lower the quality grade, the lower the transmittance.
Reference)
"Optical evaluation of synthetic quartz crystals in the ultraviolet region." Ultrasonic Technology 21, no. 1 (January 2009): 75-78.
[Figure 3: Transmittance data in vacuum ultraviolet region by quality grade (140-300 nm)]
![[Figure 3: Transmittance data in vacuum ultraviolet region by quality grade (140-300 nm)]](../../upload/crystal/products/crystal_n-grade-ex_img07.png)
Measuring Device: JASCO Corporation Measurement Wavelength : 130 to 300nm
■High Laser Resistance
High resistance to long-time irradiation of 193 nm ArF laser is also obtained.
N-Grade EX grade shows almost no decrease in transmittance before and after irradiation (Figure 4).
The transmittance of ordinary products decreases after laser irradiation. It is thought to depend on the amount of impurities in the synthetic quartz (Figure 5).
[Figure 4 : Laser Resistance of "N-Grade EX" ]
![[Figure 4 : Laser Resistance of N-Grade EX ]](../../upload/crystal/products/crystal_n-grade-ex_img09.png)
[Figure 5 : Laser Resistance of Standard Products]
![[Figure 5 : Laser Resistance of Standard Products]](../../upload/crystal/products/crystal_n-grade-ex_img08.png)
Laser Irradiation Conditions : ArF Excimer Laser 50mJ/cm2,100Hz,1×105 shot
Device : VARIAN Measurement Wavelength : 190〜800nm
■Radiation Resistance
Even when irradiated with gamma rays, our high-purity artificial quartz keeps energy absorption low due to defects.
In other words, it is expected that excellent characteristics will be obtained even in the space environment.
Please try it as a window material for cameras and devices used in space and radiation environments.
Main Applications
Quartz Wave Plate, Polarizer, Prism, Various Window Materials
Substrates and components for quartz crystal units used in space, nuclear facilities, and other radiation environments
Especially required for Arf excimer laser optical componets
Ideal for a prism of a spectrometer that measures the ultraviole region
Substrates for angular velocity sensors for aircraft
Substrates for X-ray monochromators
Specifications
■Lumbered / Standard Specifications
Lumbered synthetic quartz crystal is a synthetic quartz crystal with X and Z planes machined to specified dimensions and angles.
The surfaces of lumbered synthetic quartz crystal are machined with high precision, enabling accurate wafer cutting.
The synthetic quartz crystals are lumber processed in the Z area only and without seed crystals.
In addition to standard products, we can also accommodate requests for dimensions up to X:87.0 mm, Z:50.0 mm.
(Y effectiveness length varies depending on the X and Z dimensions.)
*Please inquire for special specifications.
■Lumbered / Block Outline Drawing
◆Precautions for Use
Make sure to read the following carefully before using synthetic quartz crystals:
Crystal quartz changes from α crystal to β quartz crystal at a temperature of 573℃ because of phase transition. This phase transition is reversible, but transition from β quartz crystal to α crystal does not take plase homogeneously, and twins are created. Therefore, careful attention must be paid to never allow the temperature to rise above 573℃.
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