The study of photo-thermal lensing system and its applications

The high quality optical films in coatings with low absorption and good environmental stability are required for the development of high power lasers, because even slightest absorbing defects could lead to material's breakdown. Thus, a non-destructive absorption measurement is required to measure the absorption of defects. Reflection-transmission method is the simplest measurement to measure the absorption of optical films. This indirect method is good for absorption values down to ~0.1%. However, typical high quality optical coatings have absorption values measured in parts per million (ppm). In this thesis, the photo-thermal lens setup provides another way to measure the change in the sample related to heating with sensitivity up to 10^{-6}. This technique is a pump-probe technique which depends on a change in an optical property measured by a weak probe laser that results from heating by a strong pump. The photo-thermal setup is used to measure absorption with time resolution and identify defects in optical coatings.

Name thesis:degree_name

Optical Science and Engineering

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Optical Science and Engineering

Year

2014

Author dc:creator

• ZHANG, XUERONG

Contributors dc:contributor

• Rudolph, Wolfgang
• Emmert, Luke
• Zadeh, Mani

Language dc:language

English

Identifier

https://digitalrepository.unm.edu/ose_etds/50

OAI identifier oai:identifier

oai:digitalrepository.unm.edu:ose_etds-1049