Thin Film Polarizers for Laser Applications

22 Mar 2018

EKSMA Optics offers a wide range of  thin film polarizers designed for operation with high power lasers. Polarizers are used to separate s- and p- polarized components of particular wavelength or wavelength range.

Our standard thin film polarizers are deposited on precision UV fused silica or N-BK7 glass substrates and feature high laser damage thresholds. The wavelength range of standard EKSMA Optics thin film polarizers offered ex-stock is from 266 nm to 1064 nm.

We have designed different versions of thin film polarizers for optimal performance in different laser applications:

• Standard - Rs/Tp:>99.5/95.0%, extinction ratio Tp/Ts >200:1
• High Transmission (HT) - Rs/Tp:>99.5/99.0%, extinction ratio Tp/Ts >200:1
• Ultra High Transmission (UHT) - Ts<0.2%, Rp<0.2%, extinction ratio Tp/Ts >500:1
• High Extinction Ratio (HE) - Tp>98%, Ts<0.1%, extinction ratio Tp/Ts >1000:1

EKSMA Optics manufactures polarizers for different angles of incidence:

- Thin Film Polarizers, AOI=45°
S-polarized beam is reflected at 90°. Back side antireflection coated.

- Thin Film Polarizers, AOI=56°
Highest extinction ratio can be achieved when polarizer operates at Brewster angle. The uncoated back side has minimal reflection for p-polarized beam.

- Broadband Thin Film Polarizers, AOI=70°
Designed to be used in high energy laser systems, typically as extracavity attenuators for broadband lasers.

We also offer custom thin film polarizers designed for your particular application. Please contact EKSMA Optics with your specific inquiry