National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Thermal Lensing in Infrared Laser Window Materials.

AD749481

Publication Date	1972
Personal Author	Gianino, P. D.; Jasperse, J. R.
Page Count	52
Abstract	A theoretical investigation of thermal lensing in infrared windows is presented which treats aberration effects to all orders in the small angle-of-deviation approximation. The model is applied to a truncated, Gaussian, infrared laser beam incident on a semitransparent, isotropic, disc-shaped window. It is shown that window aberrations limit the time a diffraction-limited focus can be held in the far-field. This diffraction-limited time td is computer for some candidate window materials and their relative merits are discussed. Some approaches to solving the thermal lensing problem from both an engineering and a materials point of view, as well as some program research and development needs, are discussed. (Author)
Keywords	Infrared windows Irasers Optical properties Infrared optical materials Focusing Thermal stresses Refractive index Diffraction Coherent radiation Thermal conductivity Mathematical analysis Thermal lens effect Laser materials
Source Agency	Invalid Source Agency Code
NTIS Subject Category	46C - Optics & Lasers
Corporate Authors	Air Force Cambridge Research Labs L G Hanscom Field Mass
Document Type	Technical Report
Title Note	Physical science research papers.
NTIS Issue Number	197222

Thermal Lensing in Infrared Laser Window Materials.

Thermal Lensing in Infrared Laser Window Materials.
AD749481

Publication Date	1972
Personal Author	Gianino, P. D.; Jasperse, J. R.
Page Count	52
Abstract	A theoretical investigation of thermal lensing in infrared windows is presented which treats aberration effects to all orders in the small angle-of-deviation approximation. The model is applied to a truncated, Gaussian, infrared laser beam incident on a semitransparent, isotropic, disc-shaped window. It is shown that window aberrations limit the time a diffraction-limited focus can be held in the far-field. This diffraction-limited time td is computer for some candidate window materials and their relative merits are discussed. Some approaches to solving the thermal lensing problem from both an engineering and a materials point of view, as well as some program research and development needs, are discussed. (Author)
Keywords	Infrared windows Irasers Optical properties Infrared optical materials Focusing Thermal stresses Refractive index Diffraction Coherent radiation Thermal conductivity Mathematical analysis Thermal lens effect Laser materials
Source Agency	Invalid Source Agency Code
NTIS Subject Category	46C - Optics & Lasers
Corporate Authors	Air Force Cambridge Research Labs L G Hanscom Field Mass
Document Type	Technical Report
Title Note	Physical science research papers.
NTIS Issue Number	197222