<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fd3f6-4282-7966-a0e4-34dfe82aebc3,g:b0b59b50-a8fa-46f5-9f3a-1192d6fb28af-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.nlight.net/role/Cover" xlink:type="simple" xlink:href="lasr-20260806.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.nlight.net/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019fd3f6-4282-7456-bb49-d474dd98572f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_DocumentType_019fd3f6-4282-7456-bb49-d474dd98572f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019fd3f6-4282-70d8-a473-641d983313b6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_DocumentPeriodEndDate_019fd3f6-4282-70d8-a473-641d983313b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019fd3f6-4282-71c5-b46e-64ecfcfb2ea9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityRegistrantName_019fd3f6-4282-71c5-b46e-64ecfcfb2ea9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019fd3f6-4282-7747-8637-1d2d8c7eba48" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019fd3f6-4282-7747-8637-1d2d8c7eba48" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019fd3f6-4282-7906-ac9f-b6b735ce5734" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityFileNumber_019fd3f6-4282-7906-ac9f-b6b735ce5734" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019fd3f6-4282-7928-ad64-1f93aec28ce6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityTaxIdentificationNumber_019fd3f6-4282-7928-ad64-1f93aec28ce6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019fd3f6-4282-7159-8214-f352030bc1dd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityAddressAddressLine1_019fd3f6-4282-7159-8214-f352030bc1dd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019fd3f6-4282-7f24-b07a-5319e2f4e808" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityAddressCityOrTown_019fd3f6-4282-7f24-b07a-5319e2f4e808" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019fd3f6-4282-7a94-8713-768c1a78303f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityAddressStateOrProvince_019fd3f6-4282-7a94-8713-768c1a78303f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019fd3f6-4282-7b10-b487-6dc64b440a55" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityAddressPostalZipCode_019fd3f6-4282-7b10-b487-6dc64b440a55" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019fd3f6-4282-7755-93af-5c5fd4f27899" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_CityAreaCode_019fd3f6-4282-7755-93af-5c5fd4f27899" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019fd3f6-4282-70b8-b1a2-a89d6bc601b6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_LocalPhoneNumber_019fd3f6-4282-70b8-b1a2-a89d6bc601b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019fd3f6-4282-748c-95e3-1b9f71b0a3e1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_WrittenCommunications_019fd3f6-4282-748c-95e3-1b9f71b0a3e1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019fd3f6-4282-7662-a445-ae2e73baab02" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_SolicitingMaterial_019fd3f6-4282-7662-a445-ae2e73baab02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019fd3f6-4282-794c-a686-4b1fee723970" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_PreCommencementTenderOffer_019fd3f6-4282-794c-a686-4b1fee723970" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019fd3f6-4282-702e-8676-5c69a5fd8a6d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019fd3f6-4282-702e-8676-5c69a5fd8a6d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019fd3f6-4282-76cd-ba07-922186b92c2b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_Security12bTitle_019fd3f6-4282-76cd-ba07-922186b92c2b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019fd3f6-4282-714a-9367-ee7152b8d320" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_TradingSymbol_019fd3f6-4282-714a-9367-ee7152b8d320" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019fd3f6-4282-7bd3-a95c-3423c21e5bf1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_SecurityExchangeName_019fd3f6-4282-7bd3-a95c-3423c21e5bf1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019fd3f6-4282-769b-a8c5-4482453c9c3b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityEmergingGrowthCompany_019fd3f6-4282-769b-a8c5-4482453c9c3b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019fd3f6-4282-7129-9857-6cfbba4f1ad3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_EntityCentralIndexKey_019fd3f6-4282-7129-9857-6cfbba4f1ad3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019fd3f6-4282-7fdd-a274-e317c6f48bd1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fd3f6-4282-724d-811e-ddae24302e02" xlink:to="loc_dei_AmendmentFlag_019fd3f6-4282-7fdd-a274-e317c6f48bd1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
