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在一种工程化非线性晶体中实现高功率连续波激光器的超可调谐宽带向上转换。

Super-tunable, broadband up-conversion of a high-power CW laser in an engineered nonlinear crystal.

作者信息

Bostani Ameneh, Tehranchi Amirhossein, Kashyap Raman

机构信息

Department of Engineering Physics, Polytechnique Montreal, Montreal, QC, H3T 1J4, Canada.

Department of Electrical Engineering, Polytechnique Montreal, Montreal, QC, H3T 1J4, Canada.

出版信息

Sci Rep. 2017 Apr 13;7(1):883. doi: 10.1038/s41598-017-00974-3.

DOI:10.1038/s41598-017-00974-3
PMID:28408758
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5429828/
Abstract

A specially-designed chirped periodically poled lithium niobate nonlinear crystal was fabricated with a phase-matching bandwidth as large as 50 nm for sum frequency generation to operate at room and higher temperatures. This device also benefits from insensitivity to laser frequency drift and fine alignment. The loosely-focused beam position of a high-power CW laser at around 1550 nm is optimized within the grating for maximum up-conversion efficiency, to realize a super-tunable source in the range of 770-778 nm by tuning a narrowband control signal over 30 nm in the communication band. This device is demonstrated to be fully phased-matched simultaneously for both second-order nonlinear up-conversion processes, namely second harmonic generation and sum frequency generation. The measurement of the generated sum-frequency power versus wavelength agrees well with the theory. The device allows for the creation of tunable broadband CW sources at shorter wavelengths with potentially high power.

摘要

一种特殊设计的啁啾周期极化铌酸锂非线性晶体被制造出来，其用于和频产生的相位匹配带宽高达50纳米，可在室温和更高温度下工作。该器件还具有对激光频率漂移不敏感和对准要求低的优点。高功率连续波激光器在1550纳米左右的松散聚焦光束位置在光栅内进行了优化，以实现最大上转换效率，通过在通信波段内将窄带控制信号调谐超过30纳米，在770 - 778纳米范围内实现超可调谐源。该器件被证明对于二阶非线性上转换过程（即二次谐波产生和和频产生）同时实现了完全相位匹配。所产生的和频功率与波长的测量结果与理论非常吻合。该器件能够产生具有潜在高功率的较短波长可调谐宽带连续波源。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/a98da1c177f9/41598_2017_974_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/5d278640fbd8/41598_2017_974_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/18397f8be008/41598_2017_974_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/3ad98ad14011/41598_2017_974_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/2d7c6992af7f/41598_2017_974_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/e03304d3dab6/41598_2017_974_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/a98da1c177f9/41598_2017_974_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/5d278640fbd8/41598_2017_974_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/18397f8be008/41598_2017_974_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/3ad98ad14011/41598_2017_974_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/2d7c6992af7f/41598_2017_974_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/e03304d3dab6/41598_2017_974_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7fde/5429828/a98da1c177f9/41598_2017_974_Fig6_HTML.jpg

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