In optics, a doublet is a type of lens made up of two simple lenses paired together. Such an arrangement allows more optical surfaces, thicknesses, and formulations, especially as the space between lenses may be considered an "element." With additional degrees of freedom, optical designers have more latitude to correct more optical aberrations more thoroughly.
Achromatic Lenses/cemented lenses/glued lenses/doublets are achromatic consists of a positive low-index Crown Glass lens element cemented to a negative high-index Flint Glass lens element. The elements are chosen so as to cancel chromatic aberration at two well-separated wavelengths, usually in the blue and red region of the spectrum. Focal length is constant at those two wavelengths and focal length shifts are virtually eliminated across the visible wavelengths. One frequent use is to achieve diffraction limited focusing of a laser beam. Negative Achromats are typically used when there is a need to eliminate chromatic aberration. In addition to reducing chromatic aberration at the design wavelengths, spherical aberration and coma are greatly reduced.
Shanghai Jujin International Co., Ltd. Supply all kinds of achromatic lens as per your requested.
Specification of our achromatic lens as follow: *Material: BK7 and ZF2(or according to your request) *Dia.: +0/-0.05 *Center thickness tolerance: +/-0.1 *Surface quality: 60-40 Scrath/Dig *Surface figure: 0.5-0.2 *Centration < 3arc min *Chamfer: 0.1-0.25*45 degrees *Design wavelength: 486.1mm, 587.6mm, 656.3mm (the parameter is dimension of normal lens, so specification will be changed according to different dimension and material)
Range of diameter
Dia.0.7mm-Dia.400mm
Range of curve radius
R1.5-R∞ etc.
Tolerance of diameter
+/-0.1, +/-0.01, +/-0.005 etc.
Surface accuracy
λ , 1/2λ , 1/4λ , 1/10λ etc.
Tolerance of Thickness
+/-0.1, +/-0.05, +/-0.01 etc.
Centration
+/-2′,+/-1′ etc.
Aperture N
5, 1 etc.
Irregularity ΔN
2, 1, 0.5, 0.2 etc.
Surface quality
60/40, 40/20, 20/10, 10/5 etc.
Packaging & Shipping
Packaging and Shipping
Safe packaging and differents shipping you can choose
Other Products
Other Relevant Products:
Candle Holder
Crystal Ball
Crystal Block
Storm glass
Crookes Radiometer
Crystal Paper weight
Candle Holder
Refrigerator magnet
Our Services
1. Label printing--We can print labels on the bottles according to customers’ requirements.
2. Surface handing--Screen printing,frosted,hot stamping,slik printing, acid etc,decal etc.
3. Packing--Standard export carton and pallet,or packed as you need.
4. Customer test--Ensure products in super quality and good condition.
5. Certification-- FDA SGS etc can be passed.
6. Brand name--OEM&ODM are welcome.
7. Quick reply-- We will reply your inquiry in 24 working hours.
Company Information
Manufacture all kinds of Glass products, such as Candle Holder, Glass Crafts ,Candles ,Crystal Crafts, Glass candle holder, candle holder, Mosaic item, LED candle holder, Lantern, Lamp, Shade, Votive, Tealight, Ceramic Candle Holder, Glass Vase, Glassware item, Antique Imitation Crafts, Painting & Calligraphy, and other glass utensils, there is always a right for you. Our product is environmental protection product, nontoxic, conforms to European quality standard. Produced products are high quality products, export to many countries such as Germany, the United States, France, England, Scotland, Ireland, Spain, Japan, etc. The company adhering to the "quality first, reputation first, innovation endless" business philosophy, to build their brand. Tell us your needs, we will serve you wholeheartedly!
EXHIBITION
FAQ
FAQ
1. Can you provide samples?
Yes, we can.
2. Do you provide safe packing for the glassware?
Yes, for each specification, we have fit mould of styrofoam accordingly, so, the products can be taken care safely inside.
3. What is the MOQ?
Usually minimum producing Qty is 500pcs. For certain style we might happen to have stock for retailer, you can order less Qty.
4. Can you print our logo on the products or packing?
A: Yes.
5. How to ship to us from your factory?
A: Optional: by sea or by air, by full container or LCL.
6. How to make the payment to you?
A: We accept payment by T/T; Western Union, etc.
7. Can you provide more pictures & details of the product so that I can introduce to my customer?
A: Yes, please contact our sale person for more information.
To Get Faster Reply
A good inquiry is important in order to get fast and good reply:
Many inquiries from around the world are created everyday by those who are interested on products,
services and the company. Each inquiry will be automatically transferred to our business email system
within 10 minutes, and then, it will be analyzed by our professional sales team from several aspects to
define the quality. The better the inquiry quality is created, the faster the reply goes.
Due to time limit notall inquiries might get a reply although we are sincere to each incoming inquiry with thanks.
Basically, the following aspects will make up to A GOOD INQUIRY.
1. Sender
2. Company
3. Email(s)
Personal Email, Company Email, or Both
4. Product(s)
Name, Model Number, Preferred Features, Functions and Applications
5. Quantity
First Trial Order, Regular Order
(It is not important for the quantity to be large or small and this will not affect the inquiry quality level.)
6. Respond-time
Please indicate it clearly and this also will catch more attention.
Respond Time:
If the respond time is not clearly indicated, the reply to inquiry will be done according to the quality level of inquiry.
In business hours from Monday to Friday and except holidays, reply will usually be like the following schedules.
Immediately
Within 24 hours
Within 3 days
Replies to most inquiries recognized with good quality will be done within 24 hours if you do
not require an immediate answer.
No-reply
General inquiries will get replied within 3 days usually.
Some inquiries might not get a reply but you can still try to create a better inquiry.
Principle:
Depends on Law of conservation of momentum and the theorem of momentum to swing the ball each other.
