The Contractor shall provide The Advanced Laser Source Development Team at the Army Research Laboratory (ARL) with quantity 12 (Twelve) 45-degree Dichroic Mirrors for use in kilowatt (kW)-class laser and quantity 12 (Twelve) 45-degree Turning Mirrors for use in kW-class laser with the following specifications:

1. Twelve 45-degree Dichroic Mirrors for use in kW-class laser:

• The dichroic mirror must handle at least 2 (two) kW of average power.
• The mirror shall have an anti-reflection coating on one surface to minimize light loss, and a high-reflectivity coating on the other surface to reflect the laser at a specific wavelength.

• This mirror shall adhere to tight tolerances for dimensions and surface properties, ensuring minimal imperfections and high accuracy.

The Following are the minimum requirements requested by the Government:

• • Material: Fused silica
  • Type: Plane mirror, separator
  • Diameter: 50.0 millimeters (mm) (tolerance: greater than -0.1 mm to less than or equal to 0)
  • Thickness: 9.5 mm (tolerance: greater than -0.1 mm to less than +0.1 mm)
  • Angular Deviation: Less than 5 (five) minutes of arc

Surface 1 (S1) Specifications:

• • Surface Quality: Scratch/Dig: 3/1 (0.2)
  • Flatness: Wavelength of Light (L)/10 regularity (within 1/10 of the wavelength of light)
  • Surface Roughness: 5/4 x 0.063; L3 x 0.004
  • Anti-Reflection Coating:
    • Angle of Incidence: 45 degrees (°)
    • Wavelength Range: 1120-1150 nanometer (nm)
    • Reflectance: < 0.6%

Surface 2 (S2) Specifications:

• • Surface Quality: Scratch/Dig: 3/1 (0.2)
  • Flatness: L/10 regularity (within 1/10 of the wavelength of light)
  • Surface Roughness: 5/4 x 0.063; L3 x 0.004
  • High Reflectivity Coating:
    • Angle of Incidence: 45°
    • Wavelength: 1070 nm
    • Reflectance: > 99.5%
  • Reflectance (Ru):
    • Angle of Incidence: 45°
    • Wavelength: 1120 nm
    • Reflectance: < 5%

2. Twelve 45-degree Turning Mirrors for use in kW-class laser:

• Mirror shall be plane, with a commercial polish on one side and a high-reflectivity coating on the other.

• Mirror shall be capable of reflecting the laser at wavelengths between 1030 and 1064 nm with an efficiency greater than 99.95%.

• The Following are the Government’s Minimum requirements: Material: Fused silica
• Type: Plane mirror
• Diameter (Ø): 50.0 mm (tolerance: greater than -0.1 mm to less than or equal to 0)
• Thickness (t): 9.5 mm (tolerance: greater than -0.1 mm to less than +0.1mm)
• Angular Deviation: Less than 5 (five) minutes of arc

Surface 1 (S1):

Finish: Commercial polish (a standard level of polishing for general optical applications)

Surface 2 (S2):

• • • Effective Diameter: 40 mm
    • Scratch/Dig: 3/0.2 (0.2)
    • Flatness: [L/10]
    • Surface Roughness: 5/4 x 0.063; L3 x 0.004

High Reflectivity Coating (HR):

• Angle of Incidence: 45°
• Wavelength Range: 1030-1064 nm
• Reflectance: HR Greater than 99.95%

Delivery shall be twelve weeks after award contract award (ACA); delivery to:

US ARMY RESEARCH LABORATORY 2800 Powder Mill Rd Adelphi, MD 20783.

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