Featured Product
This Week in Quality Digest Live
Management Features
Master Gage and Tool Co.
Why it matters for accurate measurements
Lee Simmons
Lessons from a deep dive into 30 years of NFL and NBA management turnover
Mike Figliuolo
Sure, you have to be professional, but have a good time anyway
Margaret Graziano
Unlocking the power of organizational culture
Graham Ward
Asserting yourself and setting clear boundaries

More Features

Management News
A tool to help detect sinister email
Developing tools to measure and improve trustworthiness
Manufacturers embrace quality management to improve operations, minimize risk
How well are women supported after landing technical positions?
Adds increased focus on governance
Survey shows 85% of top performers rely on it to achieve business objectives

More News

Quality Digest


Low Tolerances in Optics Used for Monitoring Laser Power

Improved design of polarization-independent beam splitters

Published: Monday, May 29, 2023 - 11:00

(Laser Components: Olching, Germany) -- With an improved optical design and the broadband monitoring of production processes, Laser Components has succeeded in further optimizing the tolerances of polarization-independent beam splitters.

These optics are used for real-time measurement of laser power in applications in which the polarization of the laser beam can change. For example, |Rs-Rp|<0.2% applies to the reflectance values, thus the ratio of s and p polarization does not change during beam splitting.

Diagram of a beam splitter  Description automatically generated with medium confidence
Polarization-independent beam splitter

The manufacture of polarization-independent beam splitters is a complex process in which the coating process must be carefully monitored. Usually, the coatings are deposited in an ion-assisted deposition (IAD) or ion-beam sputtering (IBS) system. This produces coatings with a very high packing density, which in turn allows the optics to retain their properties even in a vacuum or under severe temperature fluctuations.

The real-time monitoring of laser power is used in applications that require permanently stable performance. If irregularities are detected, the pump power can be adjusted to compensate for them. The measurement is performed on a decoupled part of the laser beam. Even slight irregularities in the polarization of the laser would falsify the measurement results of a polarizing beam splitter.

Further product information: Partially Reflective Coating


About The Author

Quality Digest’s picture

Quality Digest

For 40 years Quality Digest has been the go-to source for all things quality. Our newsletter, Quality Digest, shares expert commentary and relevant industry resources to assist our readers in their quest for continuous improvement. Our website includes every column and article from the newsletter since May 2009 as well as back issues of Quality Digest magazine to August 1995. We are committed to promoting a view wherein quality is not a niche, but an integral part of every phase of manufacturing and services.