CN114384696B - Novel double-ion ultraviolet fluorescence imaging optical system - Google Patents
Novel double-ion ultraviolet fluorescence imaging optical system Download PDFInfo
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- CN114384696B CN114384696B CN202111607323.3A CN202111607323A CN114384696B CN 114384696 B CN114384696 B CN 114384696B CN 202111607323 A CN202111607323 A CN 202111607323A CN 114384696 B CN114384696 B CN 114384696B
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Abstract
The invention discloses a novel double-ion ultraviolet fluorescence imaging optical system, which comprises two imaging light paths of beryllium ions and calcium ions; the beryllium ion imaging light path comprises an ion vacuum isolation window, a first lens group, a spectroscope, a second lens group, a first reflecting mirror, a beam combining mirror and an image surface which are sequentially arranged along the incident light direction; the calcium ion imaging light path comprises an ion vacuum isolation window, a first lens group, a spectroscope, a second reflecting mirror, a third lens group, a beam combining mirror and an image surface which are sequentially arranged along the incident light direction; the first lens group comprises a first positive lens, a second negative lens, a third positive lens, a fourth positive lens and a fifth positive lens which are sequentially arranged; the second lens group comprises a negative lens six and a positive lens seven which are sequentially arranged; the third lens group comprises a positive lens eight and a negative lens nine which are sequentially arranged. The optical system can observe imaging effects of calcium ions and beryllium ions in real time, and has the advantages of compact and reasonable integral mechanical structure, convenience in assembly and test, lower cost and easiness in processing.
Description
Technical Field
The invention relates to a novel double-ion ultraviolet fluorescence imaging optical system, and belongs to the technical field of optical imaging.
Background
Ion imaging is a new technology developed in recent years, and has become a powerful experimental technical means in the research of molecular photolysis dynamics. The difficulty of the double-ion ultraviolet fluorescence imaging is that: most of the existing imaging materials have low transmittance to ultraviolet light, while materials with high partial transmittance are expensive and difficult to process. It is more difficult to observe the imaging effect of two ions in real time because the ultraviolet fluorescence emitted by the excited ions is different. The invention can observe the imaging effect of calcium ions and beryllium ions in real time, and has the advantages of lower cost and easy processing of materials.
Disclosure of Invention
The invention provides a novel double-ion fluorescent imaging optical system which can observe imaging effects of calcium ions and beryllium ions in real time, has low cost and is easy to process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a novel double-ion ultraviolet fluorescence imaging optical system comprises two paths of imaging optical paths of beryllium ions and calcium ions, wherein the beryllium ions are stimulated to emit fluorescence of 313nm, and the calcium ions are stimulated to emit fluorescence of 397 nm;
the beryllium ion imaging light path comprises an ion vacuum isolation window, a first lens group, a spectroscope, a second lens group, a first reflecting mirror, a beam combining mirror and an image surface which are sequentially arranged along the incident light direction;
the calcium ion imaging light path comprises an ion vacuum isolation window, a first lens group, a spectroscope, a second reflecting mirror, a third lens group, a beam combining mirror and an image surface which are sequentially arranged along the incident light direction;
the beryllium ion imaging light path and the calcium ion imaging light path share an ion vacuum isolation window, a first lens group, a spectroscope, a beam combining lens and an image plane; the beam splitter transmits 313nm light and 397nm light, and the beam combiner has the function of combining 313nm light and 397nm light into one beam;
the first lens group comprises a first positive lens, a second negative lens, a third positive lens, a fourth positive lens and a fifth positive lens which are sequentially arranged along the incident light direction; the second lens group comprises a negative lens six and a positive lens seven which are sequentially arranged along the incident light direction; the third lens group includes a positive lens eight and a negative lens nine, which are sequentially arranged in the incident light direction.
The beam splitter transmits 313nm light and 397nm light, and the beam combiner has the function of combining 313nm light and 397nm light into one beam of light and imaging on the CCD.
The imaging system can image the ions 40 times amplified and can observe the ions through a CCD.
The imaging system of the invention can observe all calcium and beryllium ions in the range of 100um, and the NA of the object side is 0.41.
The focal length of the beryllium ion imaging optical path is 17.6mm, and the focal length of the calcium ion imaging optical path is 4.2mm.
In order to ensure imaging effect, along the incident light direction, two surfaces of a first positive lens are a first object side surface and a first image side surface in sequence, two surfaces of a second negative lens are a second object side surface and a second image side surface in sequence, two surfaces of a third positive lens are a third object side surface and a third image side surface in sequence, two surfaces of a fourth positive lens are a fourth object side surface and a fourth image side surface in sequence, two surfaces of a fifth positive lens are a fifth object side surface and a fifth image side surface in sequence, two surfaces of a sixth negative lens are a sixth object side surface and a sixth image side surface in sequence, two surfaces of a seventh positive lens are a seventh object side surface and a seventh image side surface in sequence, two surfaces of a eighth positive lens are an eighth object side surface and an eighth image side surface in sequence, and two surfaces of a ninth negative lens are a ninth object side surface and a ninth image side surface in sequence; the curvature radius of the first object side surface is-43.65 plus or minus 0.02mm, and the curvature radius of the first image side surface is-24.55 plus or minus 0.02mm; the curvature radius of the second object side surface is-71.44 +/-0.02 mm, and the curvature radius of the second image side surface is infinity; the radius of curvature of the third object side surface is-155.245 plus or minus 0.02mm, and the radius of curvature of the third image side surface is-48.7547 plus or minus 0.02mm; the curvature radius of the fourth object side surface is-100.003 plus or minus 0.02mm, and the curvature radius of the fourth image side surface is-60.14 plus or minus 0.02mm; the curvature radius of the fifth object side surface is 128.87 plus or minus 0.02mm, and the curvature radius of the fifth image side surface is-128.87 plus or minus 0.02mm; the radius of curvature of the sixth object side surface is-14.571 plus or minus 0.02mm, and the radius of curvature of the sixth image side surface is 38.08 plus or minus 0.02mm; the curvature radius of the seventh object side surface is-143.432 plus or minus 0.02mm, and the curvature radius of the seventh image side surface is-20.56 plus or minus 0.02mm; the curvature radius of the eighth object side surface is 69.82 plus or minus 0.02mm, and the curvature radius of the eighth image side surface is-593.503 plus or minus 0.02mm; the radius of curvature of the ninth object side surface is-21.07 + -0.02 mm, and the radius of curvature of the ninth image side surface is 21.07 + -0.02 mm.
In order to achieve both imaging effect and imaging stability, the center thickness of the first positive lens is 9+ -0.1 mm, the center thickness of the second negative lens is 4+ -0.1 mm, the center thickness of the third positive lens is 7+ -0.1 mm, the center thickness of the fourth positive lens is 5+ -0.1 mm, the center thickness of the fifth positive lens is 11.8+ -0.1 mm, the center thickness of the sixth negative lens is 3+ -0.1 mm, the center thickness of the seventh positive lens is 6.6+ -0.1 mm, the center thickness of the eighth positive lens is 6+ -0.1 mm, and the center thickness of the ninth negative lens is 4+ -0.1 mm.
In order to further improve the imaging effect, the center interval between the ion vacuum isolation window and the first positive lens is 21.74mm plus or minus 0.01mm, the center interval between the first positive lens and the second negative lens is 3.20 plus or minus 0.01mm, the center interval between the second negative lens and the third positive lens is 2.40 plus or minus 0.01mm, the center interval between the third positive lens and the fourth positive lens is 0.31 plus or minus 0.01mm, the center interval between the fourth positive lens and the fifth positive lens is 0.30 plus or minus 0.01mm, and the center interval between the fifth positive lens and the spectroscope is 616 plus or minus 0.01mm;
the center interval between the spectroscope and the negative lens six is 47.30 plus or minus 0.01mm, the center interval between the negative lens six and the positive lens seven is 16.10 plus or minus 0.01mm, the center interval between the positive lens seven and the reflecting mirror one is 102.50 plus or minus 0.01mm, and the center interval between the reflecting mirror one and the beam combining mirror is 40 plus or minus 0.01mm;
the center interval between the spectroscope and the second reflector is 40+/-0.01 mm, the center interval between the second reflector and the eighth positive lens is 43.80 +/-0.01 mm, the center interval between the eighth positive lens and the ninth negative lens is 67.70+/-0.01 mm, and the center interval between the ninth negative lens and the beam combining lens is 53.90+/-0.01 mm.
The center interval refers to the interval between centers of adjacent sides of the optical lens.
In order to improve imaging quality, the first positive lens is made of fused quartz, the second negative lens is made of common glass, the third positive lens is made of fused quartz, the fourth positive lens is made of fused quartz, the fifth positive lens is made of fused quartz, the sixth negative lens is made of fused quartz, the seventh positive lens is made of fused quartz, the eighth positive lens is made of common glass, and the ninth negative lens is made of common glass. The material has low cost, is easy to process, and can ensure imaging effect.
The ion vacuum isolation window is made of sapphire material, and the thickness of the ion vacuum isolation window is 5+/-0.02 mm.
The technology not mentioned in the present invention refers to the prior art.
The novel double-ion fluorescent imaging optical system can observe the imaging effect of calcium ions and beryllium ions in real time, and the positions of the spectroscope, the reflecting mirror and the beam combining mirror are reasonably distributed, so that the whole mechanical structure is more compact and reasonable, the assembly and the test are convenient, the cost is lower, and the processing is easy.
Drawings
FIG. 1 is a schematic view of the light path of a novel dual-ion ultraviolet fluorescence imaging optical system of the present invention;
FIG. 2 is a point column diagram of a 313nm optical path of the novel dual-ion fluorescence imaging optical system of the present invention;
FIG. 3 is a point diagram of the 397nm optical path of the novel dual-ion fluorescence imaging optical system of the present invention;
FIG. 4 is a graph of MTF of 313nm optical path of the novel dual-ion fluorescence imaging optical system of the present invention;
FIG. 5 is a MTF diagram of the 397nm optical path of the novel dual-ion fluorescence imaging optical system of the present invention;
in the figure, 1: vacuum isolation window, 2: positive lens one, 3: negative lens two, 4: positive lens three, 5: positive lens four, 6: positive lens five, 7: negative lenses six, 8: positive lenses seven, 9: positive lenses eight, 10: negative lenses nine, 11: spectroscope, 12: mirror one, 13: mirror two, 14: and a beam combining lens.
Detailed Description
For a better understanding of the present invention, the following examples are further illustrated, but are not limited to the following examples.
As shown in fig. 1: a novel double-ion ultraviolet fluorescence imaging optical system comprises two paths of imaging optical paths of beryllium ions and calcium ions, wherein the beryllium ions are stimulated to emit fluorescence of 313nm, and the calcium ions are stimulated to emit fluorescence of 397 nm; the beryllium ion imaging light path comprises an ion vacuum isolation window, a first lens group, a spectroscope, a second lens group, a first reflecting mirror, a beam combining mirror and an image surface which are sequentially arranged along the incident light direction; the calcium ion imaging light path comprises an ion vacuum isolation window, a first lens group, a spectroscope, a second reflecting mirror, a third lens group, a beam combining mirror and an image surface which are sequentially arranged along the incident light direction; the beryllium ion imaging light path and the calcium ion imaging light path share an ion vacuum isolation window, a first lens group, a spectroscope, a beam combining lens and an image plane; the beam splitter transmits 313nm light and 397nm light, and the beam combiner has the function of combining 313nm light and 397nm light into one beam.
The first lens group comprises a first positive lens, a second negative lens, a third positive lens, a fourth positive lens and a fifth positive lens which are sequentially arranged along the incident light direction; the second lens group comprises a negative lens six and a positive lens seven which are sequentially arranged along the incident light direction; the third lens group includes a positive lens eight and a negative lens nine, which are sequentially arranged in the incident light direction.
Table 1 optical parameters of novel lens group one of the double-ion ultraviolet fluorescence imaging optical system
The 313nm light path also passes through a spectroscope, a second lens group, a first reflecting mirror and a beam combining mirror, wherein the second lens group comprises two lenses, namely a sixth negative lens and a seventh positive lens, and the optical parameters are shown in the following table 2.
Table 2 shows the optical parameters of the lens group II of the novel double-ion ultraviolet fluorescence imaging optical system
The 397nm optical path also passes through a spectroscope, a second reflecting mirror, a third lens group and a beam combining mirror, wherein the third lens group comprises two lenses, namely a positive lens eight and a negative lens nine, and the optical parameters of the third lens group are shown in the following table 3.
Table 3 shows the optical parameters of the lens group III of the novel double-ion ultraviolet fluorescence imaging optical system
The thickness of the spectroscope and the beam combining lens in the light path diagram is 1mm, and fused quartz materials are adopted; the ion vacuum isolation window is made of sapphire material and has a thickness of 5mm. The spacing between the optical lenses in the optical path is shown in table 4.
Table 4 shows the center spacing between the optical lenses
The focal length of the beryllium ion imaging optical path is 17.6mm, the focal length of the calcium ion imaging optical path is 4.2mm, all calcium ions and beryllium ions within the range of 100um can be observed, and the object NA is 0.41.
As can be seen from the point charts of fig. 2 and 3, the focusing light spots of the 313nm and 397nm light paths are all within the diffraction limit, which proves that the light paths eliminate various aberrations and have good image quality. As can be seen from the MTF diagrams in fig. 4 and fig. 5, at the cut-off frequency of 30lp/mm, the MTF values of the 313nm and 397nm optical paths are both greater than 0.25, so that clear imaging can be performed on the CCD, and the imaging effect of the novel dual-ion fluorescent imaging optical system is better.
Claims (7)
1. A novel double-ion ultraviolet fluorescence imaging optical system is characterized in that: the device comprises two paths of imaging light paths of beryllium ions and calcium ions, wherein the beryllium ions are stimulated to emit fluorescence of 313nm, and the calcium ions are stimulated to emit fluorescence of 397 nm;
the beryllium ion imaging light path comprises an ion vacuum isolation window, a first lens group, a spectroscope, a second lens group, a first reflecting mirror, a beam combining mirror and an image surface which are sequentially arranged along the incident light direction;
the calcium ion imaging light path comprises an ion vacuum isolation window, a first lens group, a spectroscope, a second reflecting mirror, a third lens group, a beam combining mirror and an image surface which are sequentially arranged along the incident light direction;
the beryllium ion imaging light path and the calcium ion imaging light path share an ion vacuum isolation window, a first lens group, a spectroscope, a beam combining lens and an image plane; the spectroscope transmits 313nm light, 397nm light reflects, and the beam combiner combines 313nm light and 397nm light into one beam;
the first lens group comprises a first positive lens, a second negative lens, a third positive lens, a fourth positive lens and a fifth positive lens which are sequentially arranged along the incident light direction; the second lens group comprises a negative lens six and a positive lens seven which are sequentially arranged along the incident light direction; the lens group III comprises a positive lens eight and a negative lens nine which are sequentially arranged along the incident light direction; the first lens group, the second lens group and the third lens group comprise nine lenses.
2. The novel dual-ion ultraviolet fluorescence imaging optical system of claim 1, wherein: the focal length of the beryllium ion imaging optical path is 17.6mm, and the focal length of the calcium ion imaging optical path is 4.2mm.
3. The novel dual-ion ultraviolet fluorescence imaging optical system according to claim 1 or 2, wherein: along the incident light direction, two surfaces of a first positive lens are a first object side surface and a first image side surface in sequence, two surfaces of a second negative lens are a second object side surface and a second image side surface in sequence, two surfaces of a third positive lens are a third object side surface and a third image side surface in sequence, two surfaces of a fourth positive lens are a fourth object side surface and a fourth image side surface in sequence, two surfaces of a fifth positive lens are a fifth object side surface and a fifth image side surface in sequence, two surfaces of a sixth negative lens are a sixth object side surface and a sixth image side surface in sequence, two surfaces of a seventh positive lens are a seventh object side surface and a seventh image side surface in sequence, two surfaces of a eighth positive lens are an eighth object side surface and an eighth image side surface in sequence, and two surfaces of a ninth negative lens are a ninth object side surface and a ninth image side surface in sequence; the curvature radius of the first object side surface is-43.65 plus or minus 0.02mm, and the curvature radius of the first image side surface is-24.55 plus or minus 0.02mm; the curvature radius of the second object side surface is-71.44 +/-0.02 mm, and the curvature radius of the second image side surface is infinity; the radius of curvature of the third object side surface is-155.245 plus or minus 0.02mm, and the radius of curvature of the third image side surface is-48.7547 plus or minus 0.02mm; the curvature radius of the fourth object side surface is-100.003 plus or minus 0.02mm, and the curvature radius of the fourth image side surface is-60.14 plus or minus 0.02mm; the curvature radius of the fifth object side surface is 128.87 plus or minus 0.02mm, and the curvature radius of the fifth image side surface is-128.87 plus or minus 0.02mm; the radius of curvature of the sixth object side surface is-14.571 plus or minus 0.02mm, and the radius of curvature of the sixth image side surface is 38.08 plus or minus 0.02mm; the curvature radius of the seventh object side surface is-143.432 plus or minus 0.02mm, and the curvature radius of the seventh image side surface is-20.56 plus or minus 0.02mm; the curvature radius of the eighth object side surface is 69.82 plus or minus 0.02mm, and the curvature radius of the eighth image side surface is-593.503 plus or minus 0.02mm; the radius of curvature of the ninth object side surface is-21.07 + -0.02 mm, and the radius of curvature of the ninth image side surface is 21.07 + -0.02 mm.
4. The novel dual-ion ultraviolet fluorescence imaging optical system according to claim 1 or 2, wherein: the center thickness of the first positive lens is 9+/-0.1 mm, the center thickness of the second negative lens is 4+/-0.1 mm, the center thickness of the third positive lens is 7+/-0.1 mm, the center thickness of the fourth positive lens is 5+/-0.1 mm, the center thickness of the fifth positive lens is 11.8+/-0.1 mm, the center thickness of the sixth negative lens is 3+/-0.1 mm, the center thickness of the seventh positive lens is 6.6+/-0.1 mm, the center thickness of the eighth positive lens is 6+/-0.1 mm, and the center thickness of the ninth negative lens is 4+/-0.1 mm.
5. The novel dual-ion ultraviolet fluorescence imaging optical system according to claim 1 or 2, wherein: the center interval between the ion vacuum isolation window and the first positive lens is 21.74mm plus or minus 0.01, the center interval between the first positive lens and the second negative lens is 3.20 plus or minus 0.01mm, the center interval between the second negative lens and the third positive lens is 2.40 plus or minus 0.01mm, the center interval between the third positive lens and the fourth positive lens is 0.31 plus or minus 0.01mm, the center interval between the fourth positive lens and the fifth positive lens is 0.30 plus or minus 0.01mm, and the center interval between the fifth positive lens and the spectroscope is 616 plus or minus 0.01mm;
the center interval between the spectroscope and the negative lens six is 47.30 plus or minus 0.01mm, the center interval between the negative lens six and the positive lens seven is 16.10 plus or minus 0.01mm, the center interval between the positive lens seven and the reflecting mirror one is 102.50 plus or minus 0.01mm, and the center interval between the reflecting mirror one and the beam combining mirror is 40 plus or minus 0.01mm;
the center interval between the spectroscope and the second reflector is 40+/-0.01 mm, the center interval between the second reflector and the eighth positive lens is 43.80 +/-0.01 mm, the center interval between the eighth positive lens and the ninth negative lens is 67.70+/-0.01 mm, and the center interval between the ninth negative lens and the beam combining lens is 53.90+/-0.01 mm.
6. The novel dual-ion ultraviolet fluorescence imaging optical system according to claim 1 or 2, wherein: the material used for the positive lens I is fused quartz, the material used for the negative lens II is common glass, the material used for the positive lens III is fused quartz, the material used for the positive lens IV is fused quartz, the material used for the positive lens V is fused quartz, the material used for the negative lens VI is fused quartz, the material used for the positive lens seven is fused quartz, the material used for the positive lens eight is common glass, and the material used for the negative lens nine is common glass.
7. The novel dual-ion ultraviolet fluorescence imaging optical system according to claim 1 or 2, wherein: the ion vacuum isolation window is made of sapphire material, and the thickness of the ion vacuum isolation window is 5+/-0.02 mm.
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