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13th - High Level Expert Meeting (HLEM 2023) - Asphere Metrology


13th - High Level Expert Meeting (HLEM 2023) - Asphere Metrology
Di, 28. März 2023 - Mi, 29. März 2023
Buderus Arena Wetzlar - Wetzlar, Hessen
Messen und Ausstellungen


13th - High Level Expert Meeting (HLEM 2023) - Asphere Metrology

In the field of asphere metrology, many new advancements were achieved, new measurement procedures were developed and precision was noticeably improved. In previous High-Level Expert Meetings (HLEM) and workshops, developers, manufacturers and users have confirmed the great interest in asphere metrology.

Please learn more about previous events by following links (HLEM 2022, HLEM 2021, HLEM 2019, HLEM 2018, HLEM 2017; Workshop 2016; HLEM 2015; HLEM 2013; Workshop 2012; HLEM 2012, HLEM 2010)

In order to manufacture ultra-precise and high-tech optical components and to be capable of further miniaturization, reliable and extremely precise measurement technology is required. Both the introduced measurement systems as well as the results of round robin measurements show the enormous potential of this field of technology. In addition, a great need for comparability, standardization and proximity to users was also pointed out.

Save the NEW DATE  - 13th HLEM 2023, March 28th - 29th, 2023!

R e g i s t e r   H E R E !

Find here the Call for Measurements and Contributions

Find here the Program Flyer

Find here the Program-Perview

Find here the Detailed Program


This HLEM 2023 website will be actualized regularily, do you need any information that is currently not avaliable here?

Don´t hesitate to contact Mr. Klawitter in our administrative office!

HLEM 2023 BANNER 1 One Two Three 500px



ONE Location TWO Events

In spring 2023 a special event will take place - a combination of scientific event and trade fair. On the one hand our popular HLEM takes place, on the other hand, the intersting W3+ FAIR Wetzlar is held at the same time.

For the first time the Competence Centre Ultraprecise Surface Processing UPOB is taking advantage of the trade shows top class environment to host the 13th High Level Expert Meeting (HLEM 2023). The two day event with topic Asphere Metrology kicks off the day the fair is set up, March 28th 2023.

The cross-industry platform (W3+ FAIR) for enabling technologies, invites companies from optics, photonics, electronics and mechanics to Buderus-Arena Wetzlar.

Learn more by visiting W3+ FAIR website here. W3 FAIR LOGO CMYK mod208x55px


HLEM in Spring 2023

Our upcoming 13th HLEM 2023 is dedicated to the presentation of measurement results of current lenses (5 parts), discussion and dissemination of new developments and recent scientific results in asphere and free form metrology for reflective and transmissive surfaces. With this broader scope we aim to supplement our previous events while also addressing asphere and free form metrology to interested scientists, developers and manufacturers.

The five different samples are available for measurements through kind support of Asphericon, Leica Camera, Innolite and Edmund Optics. The marks on the glass samples were realized by NTG.

HLEM 2023 Lenses 1

The following samples are available:

asphere steep 15 mm (#2.1) - mounted on mandrel

double-sided asphere concave 28 mm (#10.1)  - unmounted

asphere metal mould insert 4,6 mm (#11.1)

asphere lens 10 mm (#12.1) - unmounted

double sided asphere convex 25 mm (#13.1) - unmounted


Planned Main Topics of HLEM 2023

Several companys and institutions are planning to perform measurements on the available samples.
Main topic of the conference will be the presentation of the measurement results of the four samples.

HLEM 2023 Program 1 comp

Main Topic:

Measurement of small lenses

Presentation of the results of the round robin

Comparison of current results

The following topics are also of interest:

Additional Topics:

New developments in measuring techniques for aspherical, free-form and cylindrical lenses

Measurement of unmounted aspheres

Measurement of endoscope optics

Measurement of mobile phone optics

Inner centration of aspheres

Other topics related to asphere and free-form metrology or production

D o w n l o a d    h e r e   the Detailed Program!

D o w n l o a d    h e r e   the Program Flyer!


Y o u r   c h a n c e   t o   j o i n !

Would you like to perform measurements and give a presentation?

Would you like to receive more details of the "round robin" samples?

Would you like to give a lecture without measurements?

Are you interested in participating?

Are you interested in participating in the supporting exhibition?


Please send an e-mail with your request to: Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!

D o w n l o a d   h e r e   your registration!


YSA 2023 - Young Scientist Award 

Awarding the 5th Young Scientist Award will round out the programme!

In addition to the scientific part of the event, which focuses on the topic of asphere metrology, the CC UPOB e.V. will award a prize for the 5th time in 2023. Young scientists up to the age of 30, have opportunity to present their work to an interested specialist audience during the High-Level Expert Meeting. By a jury of the participants the best work will be selected and priced.

Submissible topics are scientific papers from the following fields of activity:

precision methods e.g. MRF, SPDT, IBF ...

approaches to additive precise optics production

cleaning and coating, multi-layer coatings

metrology and data analysis in production chain for aspheres and freeforms

ultra-flatness; diffraction base plates; nanostructures

Applicants have the opportunity to apply with an abstract in english with a picture and 250 words by 15.01.2023 ==> extended to 22.02.2023 at the CC UPOB e.V. office.

At the beginning of the conference, the pre-selected works will be presented by the candidates in a short presentation.
During the breaks, the participants can continue to find out about the topics in a poster session.
At the end of the conference, the award ceremony will take place.

You will find more details in HLEM Call for Papers and also in HLEM Program Flyer.


Key Dates

Measurements & Meeting:

Start of measurements:
   1 August 2022 - 15 December 2022

Application for measurements:
   open for next meeting in 2024

Abstract deadline „none measurement contributions“:
   30 September 2022

Deadline for performing measurements:
   15 December 2022

Deadline to submit measured data:
   Not later than 2 weeks after end of your measurement period

Deadline to submit author & title:
   30 September 2022

Deadline to submit presentation slides:
   (to download by registered participants)
   20 March 2023


Deadline registration for industrial exhibition:
   1 March 2023 (first come first serve)


Start registration:
   Autum 2022 (download registration form here)

Deadline registration:
   1 March 2023 ==> extended to 15 March 2023


Organizational Details

Date of Meeting:
   28 - 29 March 2023


   Please register by letter, fax or E-Mail using the registration form.
   Following this you will receive an invoice and confirmation.

Attendance fee:
   Lecturers: € 250 (1st person)
   Members: € 250
   W3+ Exhibitors: € 500
   Wetzlar Network Partner: € 500
   Non-members / others: € 650

   Please pay in advance after you have received the invoice.

Recommended Accomodation:
   The hotel situation during the HLEM and the Trade Fair W3+ in Wetzlar is relaxed.
   We have not reserved a contingent, we recommend the following hotels:
   Leitz Hotel
   Michel Hotel
   B&B Hotel Wetzlar
   Best Western

Get Together: ==> not planned in 2023

Conference Dinner:
   Attendees of our HLEM 2023 are invited to Steakhouse Bolero in Wetzlar
   (For Entry please wear your Name Badge)
   Address: Steakhaus Bolero, Kornmarkt 7-9 / 35578 Wetzlar

  Trade Fair W3+ Visit included:
   Attendees of our HLEM 2023 can also visit the W3+ Fair free of charge

Apero after the HLEM and W3+
   Attendees of our HLEM 2023 and the W3+ are invited to network with W3+ exhibitors
   29.03.2023; Start 17:15; Lounge Area in Buderus Arena

Conference Location:
   Buderus Arena Wetzlar
Wolfgang-Kühle-Straße 1, 35576 Wetzlar, Germany

==> details are coming soon

   Learn more about all downloadable files of this event here



Mr. Heiko Klawitter
Tel.: +49 531 592-5131
Fax.: +49 531 592-69-5131
Please send e-mails to Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!

Bundesallee 100
38116 Braunschweig



Buderus Arena Wetzlar - Webseite
Wolfgang-Kühle-Straße 1







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