Order the mirror separately from the scanner: substrate, coating, clear aperture and optical test conditions belong to the optic, while angle control, repeatability and supply voltage belong to a matched motor/driver assembly. Compare ECOPTIK’s mirror offering with the Thorlabs GVS system example below, then specify your laser and mounting drawing before accepting a coating or damage-threshold figure.
CNFX editorial research · Sources checked October 12, 2026 · 6 sources
Separate the coated mirror from its positioning hardware
Substrate and coating belong to the optic; actuator and feedback belong to the scanner assembly. ECOPTIK’s page describes mirror substrate/coating options; Thorlabs describes a mirror mounted on a motor with internal optical feedback. The latter is a scanner assembly, not the construction of a bare mirror [1][2].
BOM / functional reference
What it does
Material and purchase boundary
Mirror substrate — optic
Supports the reflecting surface; the selected substrate and outline belong in the mirror drawing.
ECOPTIK lists silicon, fused silica (JGS1) and H-K9L; the GVS specification calls its substrate quartz. These are source-specific options, not one shared construction [1][4].
Reflective coating — optic
Defines the spectral reflection behaviour of the coated surface.
ECOPTIK lists aluminium, silver, gold and UV-enhanced aluminium. GVS mirrors use protected silver/gold or an E02 dielectric coating; request the actual coating curve and test conditions, not an assumed layer recipe [1][2].
Actuator / mount — scanner assembly
Turns and supports the mirror; size, shape and inertia must suit the motor.
GVS uses a moving-magnet scanning motor and shaft-mounted mirror. The reviewed sources do not identify every mount alloy or bonding method; a bare optic does not include this actuator [2].
Position sensor — scanner assembly
Feeds the mirror-position measurement back to the drive electronics.
GVS uses a light source and photocell/photodiode sensing inside the galvanometer housing. Do not label that mechanism a capacitive sensor or a supplied standalone encoder without model evidence [2].
Functional reference only, not a complete manufacturing BOM. The GVS example also needs its matched servo driver and calibrated motor cable; these are separate from the coated mirror. Thorlabs advises against user-made/calibrated replacement cables [2].
02
Choose the coating by wavelength first
Compare the listed coating bands against the laser line, angle of incidence and polarisation. The two sources describe different offerings; neither makes one reflectivity figure transferable to every mirror.
Reflectivity claims need a wavelength
ECOPTIK’s table lists >99.0% reflectivity alongside very broad coating bands, without a wavelength/angle/polarisation-resolved curve. It also offers silicon, fused silica (JGS1) and H-K9L substrates. This self-published figure does not establish >99% across every listed band or for your angle of incidence; obtain the curve for the proposed coating [1].
These are application markets, not a complete scan-head specification
ECOPTIK names laser processing, automotive LiDAR, and research/optical communication applications. Those uses do not establish a supplied motor, controller or validated performance for a complete scanner [1].
Match the damage test before using an empirical scaling estimate
Thorlabs’ model-specific damage table and overview distinguish the test wavelength by coating. Read the entries below separately; a broadband dielectric value tested at 532 nm cannot be relabelled as a measured 1064 nm threshold [5][2].
The general specifications footnote conflicts with the model damage table
Table 2.1’s shared footnote says 1064 nm, 10 ns, 10 Hz and a 1.000 mm beam for the damage entries. Table 5.1 and the overview explicitly put GVS20 at 532 nm. This page follows the model-specific wavelength in Table 5.1 and leaves the full specimen/beam/repetition-rate report for direct confirmation; it does not silently apply the conflicting footnote to all three coatings [4][5][2].
Calculate the quantity used by the test
For pulsed fluence use energy divided by beam area, with the diameter/profile definition stated. Thorlabs’ CW convention uses linear power density in W/cm, power divided by 1/e² beam diameter. Its Gaussian examples apply roughly twice the uniform-profile peak value; hotspots and other profiles need their own treatment [3][5].
Keep pulse-width scaling inside the stated range
Thorlabs gives an approximate square-root pulse-duration adjustment for 1–100 ns. Its calculation note says the empirical rules have no guaranteed accuracy and are invalid below 1 ns. A scaled number is an estimate, not a newly measured acceptance rating [5][3].
Check wavelength and absorption together
The note uses square-root wavelength scaling for nanosecond pulses and a linear trend for CW. It also warns that coating/substrate absorption can defeat the CW trend. A wavelength outside the reflecting band is not made suitable by arithmetic [5][3].
Check thermal loading as well as individual pulses
Thorlabs’ microsecond example compares both CW and pulsed thresholds. Its tutorial says high repetition-rate thermal damage also depends on absorption and thermal diffusivity, without a reliable universal conversion; supply pulse energy, repetition rate and average power [5][3].
Use clean-optic evidence for the intended beam size
The tutorial assumes room-temperature, uncontaminated optics meeting the surface-quality specification. It cautions that larger beams can encounter more defects and that simple size independence is unreliable above 5 mm. Request conditions matched to your beam; cleaning/contamination history matters [5].
CNFX’s illustrative arithmetic at the same wavelength: 3.0 × √(2 ns / 10 ns) ≈ 1.34 J/cm². This is an empirical 2 ns estimate from the silver entry, not a measured threshold or approval for the laser. Obtain the relevant test report and supplier assessment [5][3].
04
Read the scan angle the way the supplier means it
For the single-mirror reflection relation, a mechanical rotation changes the outgoing beam direction by twice that amount. Thorlabs labels the GVS limits as mechanical angles. A two-axis installation still has beam-size and geometry limits; the table is for the named GVS systems, not every bare mirror [6][4].
Ask: mechanical or optical?
Thorlabs states its ±12.5° maximum as a mechanical angle [2]. ECOPTIK lists a scanning angle of ±5° to ±50° without saying which [1]; confirm before you design the field of view.
Large beams reduce the usable angle
On a two-axis system for beams up to 5 mm, a 5 mm beam allows only ±8° on the X mirror and +12.5°/−3° on Y, while a 1 mm beam allows up to +11°/−12.5° on X [2]. Mirror size, beam size and the second mirror's position all limit the angle.
Input beam diameter
GVSx01 single-axis — mechanical
GVSx02 dual-axis X — mechanical
GVSx02 dual-axis Y — mechanical
5 mm
+10° / −12.5°
±8°
+12.5° / −3°
3 mm
±12.5°
+9.5° / −10°
±12.5°
1 mm
±12.5°
+11° / −12.5°
±12.5°
Selected rows from Thorlabs Table 2.2, Maximum Recommended Mechanical Scan Angles. The specifications tab defines the GVSx01/x02 model groups and the maximum input-scale condition; this is an assembled-system limit [4].
05
Read optical figure separately from the matched scanner’s performance
Thorlabs groups its specification table into Mirror, Motor and Position Sensor, and Drive Electronics. Preserve those boundaries when comparing an unmounted Chinese-made optic with an assembled GVS system [4].
Mirror flatness
GVS front-surface flatness is listed as λ at 633 nm. The reviewed table does not establish the ordered mirror’s mounted figure under your load/temperature; specify the test wavelength, convention and mounting condition in the drawing [4].
Mirror surface and aperture
GVS lists 40-20 scratch-dig, parallelism <3 arcmin and clear aperture >90% of dimension. Surface quality is not a measured LIDT guarantee or a substitute for a wavelength-specific coating test [4][5].
Motor/sensor resolution and repeatability
GVS lists 15 µrad repeatability. Mechanical resolution is 0.0008° with GPS011 linear power and 0.004° with a standard switch-mode supply. These describe the matched positioning system, not a bare mirror’s material or an interchangeable motor [4].
Motor/sensor drift
Scale drift is listed at 40 ppm/°C maximum and zero drift at 10 µrad/°C maximum. They describe different effects; they are not an observed marking-position error for your optical layout [4].
Drive signal and response
Full-scale bandwidth differs by waveform: DC–100 Hz square and DC–250 Hz sine, with DC–175 Hz triangular/sawtooth. The small-angle entry is ±0.2°/DC–1 kHz with a 300 µs step-response entry; do not transfer small-step speed to a full-scale move [4].
Heat and matched connections
Thorlabs warns that rapid drive changes can cause motor heat buildup/driver thermal cutout and recommends its additional heatsink for demanding scanning. Its motor cable is calibrated to the driver and internal sensor; cable substitution and thermal design need manufacturer instructions [2].
06
Specify fourteen fields with the correct optic or scanner scope
A bare mirror has no drive voltage, angular resolution or control repeatability. Those fields become meaningful only after you identify the actuator/driver assembly. Keep environmental requirements separate from unverified catalogue limits.
Parameter
Unit / scope
Meaning and verified example or unresolved value
Clear aperture
mm or %; coated optic
GVS states >90% of dimension and a 5 mm maximum beam, while the ECOPTIK mirror page gives no aperture dimension. Specify the actual illuminated footprint through the scan, not only outer size [4][1].
Surface flatness
Fraction of λ at stated wavelength
GVS lists front-surface λ at 633 nm. State surface/wavefront convention, tested area and mounted/unmounted condition; no category-wide surface grade has been verified [4].
Surface quality
Scratch-dig; optic
GVS lists 40-20. A supplier must agree the inspection specification; this notation does not itself provide a laser-damage threshold [4][5].
Reflectivity
%; wavelength/AOI/polarisation
GVS overview uses average reflectance >95% for its stated coating bands; ECOPTIK lists >99% without spectral conditions. Request the actual curve for the ordered optic [2][1].
Angular resolution
° or µrad; scanner
GVS resolution depends on supply: 0.0008° linear vs 0.004° switch-mode. A bare substrate/coating does not have a control resolution [4].
Repeatability
µrad; scanner and conditions
GVS lists 15 µrad in its motor/sensor section. Ask for the assembled system’s test conditions, not a mirror-material repeatability value [4].
Scanning range
°; mechanical vs optical
GVS recommended mechanical limits depend on beam size and axis. ECOPTIK’s ±5°–±50° label leaves the angular convention unspecified [4][1].
Operating temperature
°C; optic or assembled scanner
GVS lists 0–40 °C for motor/sensor and drive electronics. The ECOPTIK bare-mirror page does not state a usable temperature limit; do not transfer the GVS system value to that optic [4][1].
Storage temperature
°C; packaging and optic
No storage-temperature range for the ECOPTIK mirror is established by the reviewed product page. Specify your logistics/storage requirement and obtain the coating/substrate packaging instruction [1].
Relative humidity
% RH; duty/storage conditions
The reviewed ECOPTIK page does not give an RH rating or condensation qualification. Request an agreed environmental condition and inspection/handling basis; no category-wide humidity rating is established [1].
Substrate material
Grade; optic
ECOPTIK lists silicon, JGS1 fused silica and H-K9L; GVS calls its material quartz. Confirm the actual grade and drawing; catalogue material names do not resolve the full construction [1][4].
Coating type
System; spectral/test conditions
Specify the named coating, usable spectrum, incidence and polarisation. The published silver/gold/dielectric LIDT entries have different test wavelengths [2][5].
Weight / inertia
g; optic vs assembly
GVS lists 50 g motor weight with cables and without brackets; it is not bare-mirror mass. Request mirror mass/inertia and allowable mounting load for the selected motor [4][2].
Drive voltage
V; scanner electronics
GVS electronics require ±15 to ±18 VDC; its analogue command is ±10 V with selectable scale factors. Supply rails and command signal are separate, and neither is required by the bare optic [4].
07
Copy this RFQ and fill in the brackets
Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Scope: bare coated mirror / matched scanner assembly [ ], quantity [ ]
Laser: wavelength [ ], CW/average power [ ], pulse energy/width/repetition [ ]
Beam: 1/e² diameter [ ], intensity profile/hotspots [ ], incidence/polarisation throughout scan [ ]
Optic: substrate grade [ ], outline/thickness drawing revision [ ], mass/inertia limit [ ]
Coating: identified system [ ], reflectance curve and required value at each working condition [ ]
Optical inspection: clear aperture [ ], surface figure and wavelength/convention [ ], scratch-dig specification [ ]
LIDT: requested test wavelength/pulse/repetition/profile/beam size/cleanliness/temperature [ ]; report [ ]
Mount: interface/bonding/clamping requirement [ ]; figure after mounting [ ]
If scanner: motor/sensor/driver/cable [ ], mechanical vs optical travel [ ], waveform/duty and settling criterion [ ]
Environment: operating/storage temperature [ ], humidity/condensation condition [ ], packaging/handling [ ]
Acceptance/delivery: coating and figure records, exact model/assembly compatibility [ ], destination/date [ ]
1 company lists this product among what they make. Company figures are quoted from each
company's own website; every card states where the relationship came from.
ECOPTIK
China, CN
ECOPTIK’s current galvo-mirror page lists silicon/JGS1/H-K9L substrates and aluminium/silver/gold/UV-enhanced aluminium coatings. It does not establish supply of a matched scanner motor/driver or their positioning performance. Its >99% and ±5°–±50° entries need spectral conditions and an angular convention; obtain an optic drawing and model-specific test data.
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Compiled and source-reviewed by the CNFX editorial team.
Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review
· Page last updated 13 October 2026
Buyer questions
Is a galvo scan angle mechanical or optical?
Thorlabs labels its GVS maximum and recommended angles as mechanical. In a single-mirror reflection, outgoing-beam deflection is twice mirror rotation. Beam size and two-axis geometry still constrain usable travel; ask ECOPTIK which convention its ±5°–±50° label uses. [4][1][6]
Can I use a 10 ns LIDT for a 2 ns laser?
A square-root pulse-width calculation gives about 0.45 times the 10 ns value at 2 ns, but Thorlabs limits this approximation to 1–100 ns and says empirical scaling accuracy is not guaranteed. It is an estimate, not a measured threshold; below 1 ns these quoted rules do not apply. [5][3]
Silver or gold galvo mirror for a 1064 nm fibre laser?
Both sources list silver and gold coating bands covering 1064 nm. Thorlabs’ GVS00/GVS10 model damage table lists 3.0/2.0 J/cm² at 1064 nm, 10 ns. Those specific test values do not establish suitability for a different pulse, beam or coating from another supplier. [5][1]
Does the mirror’s flatness tell me the scanner’s positioning precision?
No. Thorlabs lists GVS front-surface flatness as λ at 633 nm in its mirror section, while resolution, repeatability and drift are in the motor/sensor section. Specify both optical figure and the matched assembly’s control performance; the bare mirror has no electronic resolution. [4]
Sources and what still needs a direct check
Sources checked 2026-10-12. ECOPTIK documents its mirror offering. Thorlabs documents a specific assembled GVS scanner, optical specifications, model damage entries and empirical calculations. Values retain their optic or assembly scope; the test-footnote conflict above remains a direct-check item.
ECOPTIK’s reflectance curve at the actual wavelength/AOI/polarisation, exact clear aperture, figure, LIDT test conditions and environmental limits; its ±5°–±50° convention remains unspecified.
Thorlabs GVS20 model table/overview states 532 nm, while Table 2.1’s shared footnote says 1064 nm. Obtain the full model-specific report including repetition rate and beam definition before comparing tests.
Mounted mirror figure, adhesive/clamp interface and mass/inertia compatibility with the proposed actuator. An empirical LIDT adjustment is not a test or a safe-operation guarantee.
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