{"id":32578,"date":"2024-10-02T12:26:38","date_gmt":"2024-10-02T16:26:38","guid":{"rendered":"https:\/\/www.iridian.ca\/effect-of-an-optical-coating-on-in-band-and-out-of-band-transmitted-and-reflected-wavefront-error-measurements\/"},"modified":"2024-10-02T12:26:40","modified_gmt":"2024-10-02T16:26:40","slug":"effect-of-an-optical-coating-on-in-band-and-out-of-band-transmitted-and-reflected-wavefront-error-measurements","status":"publish","type":"post","link":"https:\/\/www.iridian.ca\/zh-hans\/cn-learning-center\/effect-of-an-optical-coating-on-in-band-and-out-of-band-transmitted-and-reflected-wavefront-error-measurements\/","title":{"rendered":"Effect of an optical coating on in-band and out-of-band transmitted and reflected wavefront error measurements"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”4.16″ custom_margin=”0px|0px||0px|false|true” custom_padding=”0px|0px||0px|false|true” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row _builder_version=”4.16″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” width=”100%” custom_margin=”0px|0px||0px|false|true” custom_padding=”0px|0px||0px|false|true” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_text _builder_version=”4.27.0″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” custom_padding=”||10px||false|false” global_colors_info=”{}”]<\/p>\n

Graham Carlow,* Brian T. Sullivan, Claude Montcalm, AND Alexander Miles
Iridian Spectral Technologies Ltd., 2700 Swansea Crescent, Ottawa, Ontario K1G 6R8, Canada<\/em>
*Corresponding author: gcarlow@idexcorp.com<\/a><\/em><\/p>\n

 <\/p>\n

Abstract<\/strong><\/h4>\n

The wavefront error (WE) of a surface with an optical coating (\u201cfilter\u201d) is ideally measured at the in-band wavelength of the filter. However, quite often this is not possible, requiring that the filter be measured at an out-of-band wavelength (typically 633 nm), assuming that the filter transmits (for transmitted WE, or TWE) or reflects (for reflected WE, or RWE) at this wavelength. This out-of-band TWE\/RWE is generally assumed to provide a good estimation of the desired in-band TWE\/RWE. It will be shown in this paper that this is not the case for a large class of filters (i.e., bandpass) where the group delay is significantly different at the in-band and out-of-band wavelengths and where the optical filter exhibits a thickness non-uniformity across the surface. A theoretical explanation will be given along with an approach to predict the in-band TWE\/RWE based on the coating non-uniformity, the measured out-of-band TWE\/RWE, and the theoretical properties of the optical filter at the in-band and out-of-band wavelengths. A reasonable agreement between theory and measurement was demonstrated by measuring the TWE of an 11 nm wide bandpass filter (centered at 1048 nm) at both in-band (lambda <\/span>= <\/span>1048<\/span><\/span><\/span><\/span>n<\/span>m<\/span><\/span><\/span><\/span><\/span><\/span><\/span>) and out-of-band (lambda <\/span>= <\/span>625<\/span><\/span><\/span><\/span>n<\/span>m<\/span><\/span><\/span><\/span><\/span><\/span><\/span>) wavelengths. A similar treatment is provided for RWE.<\/p>\n

\u00a9 2020 Optical Society of America<\/p>\n

 <\/p>\n

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The wavefront error (WE) of a surface with an optical coating (\u201cfilter\u201d) is ideally measured at the in-band wavelength of the filter. However, quite often this is not possible, requiring that the filter be measured at an out-of-band wavelength (typically 633\u00a0nm), assuming that the filter transmits (for transmitted WE, or TWE) or reflects (for reflected WE, or RWE) at this wavelength. This out-of-band TWE\/RWE is generally assumed to provide a good estimation of the desired in-band TWE\/RWE. It will be shown in this paper that this is not the case for a large class of filters (i.e., bandpass) where the group delay is significantly different at the in-band and out-of-band wavelengths and where the optical filter exhibits a thickness non-uniformity across the surface. <\/p>\n","protected":false},"author":159,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2234,2230],"tags":[],"class_list":["post-32578","post","type-post","status-publish","format-standard","hentry","category-cn-technical-notes","category-cn-learning-center"],"acf":[],"yoast_head":"\nEffect optical coating on in-band and out-of-band WE<\/title>\n<meta name=\"description\" content=\"The wavefront error (WE) of a surface with an optical coating (\u201cfilter\u201d) is ideally measured at the in-band wavelength 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