IBS Coated Optics for Ho:YAG, Tm:YAG, Er:YAG Lasers

Overview

Holmium, Thulium, and Erbium-doped YAG lasers find a perfect spot in several medical applications. Listed laser lines nicely match water absorption peaks, which makes them super helpful tools to perform surgical, dental, and skin treatment procedures, where deep penetration of tissues is not desired.

Keep your precious medical laser systems free of water and laser damage.

Laser Lines

Water absorption

But there is always a but…What makes these lasers perfect for medical applications, gives a lot of headaches for laser optics manufacturers. Water absorption causes serious problems with laser induced damage.

Surface density

How come thin-film dielectric coatings get damaged due to absorption by water? It is because typical dielectric coatings are porous and H₂O molecules are likely to find their place in those pores over time. Sputtered coatings (such as IBS) feature near bulk structure due to the high atomic density of layers. So situation with IBS coatings gets simple. A dense, poreless surface means the absence of water absorption, so your laser system is free of water, thus ugly laser induced damages too.

OPTOMAN has been addressing efficiency, performance stability, and laser induced damage threshold issues related to optics used in medical laser systems. As a result, we introduce a few typical design examples of coatings manufactured for Ho:YAG, Tm:YAG and Er:YAG laser lines.

Do not forget - OPTOMAN manufactures highly customized, and application optimized optics. Our mission is to draft & craft perfect components for your laser systems.

Coatings for Ho:YAG, Tm:YAG and Er:YAG lasers

Cavity Mirrors optimized for highest LIDT and lifetime for 2100 nm lasers.

Broadband Mirrors optimized for spectral performance at AOI=o° or AOI=45°, or any other angle of incidence.

Brewster type or AOI=45° Thin-Film Polarizers optimized for spectral performance.

LIDT optimized Output couplers for 2100 nm applications.

AR @ 2100 nm coated cavity lenses and output windows optimized for LIDT.

Non-Polarizing Power Pick up plate for 2100 nm applications.

Typical residual reflectance from AR coated surface @ 2940 nm is less than 0.1%.

Measured absorption per AR @ 2940 nm coated surface does not exceed 0.35%.

LIDT optimized cavity mirrors @ 2940 nm with reflectance >99.9%.

LIDT optimized Output Couplers for 2940 nm applications. Reflectance tolerance depends on absolute split ratio.

Multiwavelength mirrors with different set of reflected multiple laser lines.

2900 nm – 3000 nm range is more complicated and is still under intense development @ OPTOMAN.

Our ultimate goal: robust and high LIDT cavity and bending mirrors, thin film polarizers, dichroic filters and etc.