Off Axis Parabolic (OAP) Mirrors for High Power Ultrashort Laser

Off Axis Parabolic (OAP) Mirrors for High Power Ultrashort Laser

Scope of Supply: This indent is for procurement of "Off Axis Parabolic (OAP) Mirrors" for ultra-short high power (up to 1PW level, 25 fs,Maximum Energy 25 J) Ti: Sapphire (800 nm) laser beam focusing. The OAP mirrors shall be compatible for use in the vacuum environment (< 10-5 mbar). Necessary quality assurance (QA) test reports as per the tender specifications should be provided. The details of OAP mirror specifications are given in the following table.


Technical specifications of Off-axis parabolic mirror

S. No.ParameterNominal value
1ConfigurationEquithick or Wedge configuration
2Diameter (mm)250 mm + 0/-1 mm
3Slant focal length (Reflected effective focal length)2000 ± 10 mm
4Off axis angle (degree)12.5o ± 0.5o
5Clear aperture≥ 230 mm
6MaterialGlass or equivalent substrate
7Reflective CoatingHigh-Reflectivity, Multi-Layer Dielectric
8Coating Reflectivity> 98.5 % for s-pol. light
9Spectral bandwidth support750 – 850 nm or wider (to be used with Ti: Sa laser operating at central wavelength at 800 nm)750 - 850
10Surface Figure Error (for OAP surface)≤ λ/4 peak to valley at 633 nm measured over clear aperture
11Surface Quality (Scratch/Dig)60/40 or better
12Laser damage threshold≥ 0.2 J /cm2 for ultra-short 20 -100fs pulses
13Marking on OAP (for axis alignment purpose)Etched mark should be provided on the back surface of the OAP showing the geometrical centre and vertex direction
14Vacuum compatibility≤ 10-5 mbar
15Quality Assurance (QA) documents (for eachOAP)(1) Dimension report (mechanical sizes, slant focal length, Off Axis distance andangle).
(2) Interferogram analysis of OAP surface after coating to assess the surface figure error over an area of at least of 100 mm in diameter or more.
(3) Reflectivity curve over full wavelength range (750 nm - 850 nm orwider). The above reports should be sent to purchaser before shipment for approval. Final shipment is allowed only after approval of test reports from purchaser side.
16Witness SampleOne witness sample (with size ≥25mm × 25 mm, or ≥diam 25mm, or of nearest standard), having identical substrate and coating shall be shipped along with OAPs at the time of delivery. The purchaser will have the discretion to independently evaluate the QA parameters and performance test on the witness sample for evaluation.


Test and Acceptance Criteria 3.1 Factory Test Reports before shipment: Following factory test reports for all OAP mirrors manufactured for supply against the purchase order shall be provided before shipment of the material:

Please quote QA test reports separately

(1) Dimension report (mechanical sizes, slant focal length, Off Axis distanceand angle)

(2) Interferogram analysis of OAP surface after coating to assess the surface figure error over an area of at least of 100 mm in diameter or more

(3) Reflectivity curve over full wavelength range (750 nm - 850 nm or wider) . The Supplier should ship the material only after approval of factory test reports from the purchaser. The witness sample shall be shipped along with OAPs at the time of delivery.


Warranty: The mirrors shall be warranted for at least three months from the date of delivery at purchaser site. Thanks



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