Orders FAQ

Here you can quickly find your answers to frequently asked questions.
If you didn't find your answer, please contact us, we will be happy to help.

Test Samples
and handling)

  • What should be the size of the test sample?

    The standard size of the test samples is circular disc of 25.4 mm (1 inch) or 50.8 (2 inches) diameter. It is also the most common size of witness samples or optical elements used in the laser systems. This size has a sufficient test area to perform most of the LIDT tests.

    However, don’t worry if your samples have different size or shape. Simply, define the parameters in the inquiry form at my.lidaris.com. Add drawing if necessary. Lidaris experts will advise you if there will be any problems about the test area or other technical issues. Please be aware, that a customized sample holder should be prepared for a non-standard sample. Thus the test price will be slightly more expensive.

  • How to mark test surface?

    To minimize the risk of error, please mark Your samples accordingly:

    [.] dot or scratch at the bottom edge of the entrance surface for very thin samples

    [V] shape pointing to entrance surface for standard optical elements

    [→] arrow showing laser propagation direction for crystals and thick samples

  • How to prepare transparent samples (crystals, prisms, windows, etc.)?

    The rear surface of transparent or anti-reflective (AR) coated samples should be polished. Never leave it matte. Otherwise, laser-induced damage threshold (LIDT) will be limited by the rear surface and the test results might be inconclusive.

    Sample thickness of the transmissive optical element (for instance AR coated substrates) is very important testing at fundamental harmonic (1ω). In order to avoid stimulated Brillouin back scattering, it should not exceed 1 cm. If it does, please contact your assistance manager to learn about difficulties and risks, which can happen during the LIDT testing.

  • How to pack samples for shipping?

    Please be aware, that packing might affect test surface of the sample and change test results.

    Please, avoid low-quality paper.

    Always use well-sealed boxes. If you are using shipping boxes with plastic membrane, put your sample in the holder, which ensures there is no contact between the test surface and the membrane.

    If you are not sure about packing choices, please contact Lidaris experts for advice.

  • Will my samples be cleaned at Lidaris?

    We do not clean samples, unless cleaning is requested in the inquiry form.

    Each sample is unpacked in the clean room. If the unpacked sample is dusty, the specks of dust are blown-off by pressured air before testing.

    If you want your samples to be cleaned at Lidaris, please note it in the inquiry form at my.lidaris.com. We have multiple cleaning solutions, but we do not clean samples by default.

and Customs

  • What is the shipping address?

    Please use testing facility (not the registration/billing) address for shipping:

    UAB Lidaris
    Sauletekio Al. 10,
    LT-10223 Vilnius,
    Lithuania, EU

  • What should be indicated on the package?

    We kindly ask our customers to indicate sales order number on the shipping box in order to speed up sample registration procedure and avoid miscommunication.

  • Will my sample be returned after testing?

    Samples are returned on customers demand.

    Sample return option should be indicated in the inquiry form at my.lidaris.com.
    Otherwise, the sample will be stored for a limited time and consequently destroyed.
    For available sample storage times consult with Your assistance manager.

  • What are samples return options?

    There are two sample return options:

    • The sample can be returned by LIDARIS. The optimal shipping method will be selected. A shipping cost of 50 Eur will be added to the testing order.
    • The sample can be returned via the customer’s provided method. A return label must be provided.


    If shipment information (for instance return label) will not be provided on time, Your sample will be shipped using LIDARIS shipping method. An extra cost will be added to your order.

  • What is the default value of the returned samples (for customs)?

    When samples are shipped back the total value of the samples (goods) are stated to be below 22 EUR for customs purposes to ensure the fastest and easiest shipping procedure.

    If You need to declare a higher value of the goods (despite the fact that they are most likely already damaged), please inform us before you confirm the return of the samples.

  • How to prepare Customs documentation?

    When preparing shipping documentation, please download these bits of advice in order to avoid any delays due to miscommunication at customs.

    Lidaris_Shipping documentation 2022

Custom Laser
Damage related

  • Is it possible to investigate the cause of already damaged optics?

    It is often possible to investigate/identify the cause of failure from the images of the damaged optical element . However, the damage should be “caught” (recorded) in it’s initiation phase.  Also, irradiation conditions should be known.  Lidaris offer a unique possibility to analyze damaged optical elements and provide quality feedback if possible. There are three possible options:

    1. Feel free to send us a picture of damage, that You want to analyze. In the request add the information about irradiation conditions (wavelength, pulse duration, repetition rate, environment). Our experts will review it. If it possible to identify the cause we can discuss it online or comment shortly in an email. Primary analysis/comments are for free.
    2. If pictures of the damage are not available of low quality, feel free to send us a damaged sample. Microscopy of the damaged surface can be done at Lidaris. In this case we will provide a  report with microscopy results and our comments.  This service can be ordered via my.lidaris.com. Select “please advice” option and comment “I need to understand origin the damage”. Provide irradiation conditions and other related information such as application field. This service costs  75 eur per analysis surface.
    3. If damage is very large – catastrophic damage (and nothing could be identified: because damage is too large and initiation is not possible to see) we can try to simulate similar irradiation conditions and make new damage with our laser on new test site (on fresh area). Then we can try to analyze damage morphology. This service can be ordered via my.lidaris.com. This service cost  is 75 eur (for analysis) + (200-500) eur (depending on irradiation conditions).
  • Is it possible to run a laser through the fiber and check the damage threshold of the fiber?

    Fiber damage is a unique project-based activity: that must be analyzed case by case. We invite you to contact us or schedule an online meeting to understand the Your needs better: what could be done and what not. Usually to test fibers, we suggest to use a single-point R-on-1 procedure by analyzing reflection or transmission signals. Typically, when fiber is damaged, it becomes very reflective and burns fast that eventually might cause damage to the pumping laser or jeopardize safety in the laboratory. So, if you are concerned, contact us, to discuss possibilities to evaluate fiber threshold in your case.

more tools and useful information

Show all
  • Testing conditions

    Check out all available laser damage testing conditions (wavelengths, pulse regimes, environments, and more).
    Find out more
  • New client guide

    Here you will find usefull guidlines and suggestions for everyone, who is new the laser damage field.
    Find out more
  • Laser Damage infobase

    Check out a useful glossary of terms and simple explanations related to the main topics of laser damage terminology.
    Find out more


Feel free to let us know if you have any concerns. We can always help you with choosing the right solution for your specific needs.