Model GTH-3.6-1.75FA -Beam Energy Distribution Lens

Working distance is given by focal length of additional lens which is always needed. Top Hat appears always at focal plane of additional lens.
For instance if an additional lens f=100 is used, Top Hat appears at 100 mm behind additional lens. So GTH-3.6-1.75FA could be easily put in front of objectives for example.

The distance between GTH-3.6-1.75FA and additional lens is not critical (up to several tens of centimeters).

The full fan angle of Top-Hat generation for GTH-3.6-1.75FA is 1.75 mrad. This leads to Top-Hat sizes:

• 88x88 µm for lens with f=50 at 50 mm distance
• 175x175 µm for lens with f=100 at 100 mm distance
• 1.75x1.75 mm for lens with f=1000 at 1000 mm distance

Material: LF5 Schott glass

n= 1.5659 @1060 nm,

n= 1.5848 @ 546 nm,
n= 1.6192 @ 365 nm

Clear aperture:  dia 11.0 mm

Damage threshold (uncoated): >3J/cm² @ 532 nm, 10 ns;

Mounted in to 1” ring holder.

• Recommended operation wavelength range 450-1550 nm
• Necessary free aperture always 2.2x beam diameter @ 1/e2, along total beam path
• Input beam TEM00 , diameter @ 1/e2: 3.6 mm ± 0.15 mm
• Achievable Top Hat size @ 1/e2 5x diffraction limited @ 1064 nm, 10x diffraction limited @ 532 nm
• Full fan angle of Top-Hat generation 1.75 mrad
• Beam energy distribution efficiency >95% of input energy within Top Hat profile
• Beam homogenity ±5 % (rel. to average intensity within Top Hat)
• Lens diameter 12.0 ± 0.1 mm
• Lens thickness 2.0 ± 0.1 mm