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Title: Coherent addition of high power broad-area laser diodes with a compact VBG V-shaped external Talbot cavity

Abstract

In this paper, we introduced a compact V-shaped external Talbot cavity for phase locking of high power broad-area laser diodes. The length of compact cavity is ~25 mm. Near diffraction-limit coherent addition of 10 broad-area laser diodes indicated that high quality phase locking was achieved. We measured the near-field emission mode of each individual broad-area laser diode with different feedback, such as a volume Bragg grating and a high reflection mirror. Finally, we found out that the best result of phase locking broad-area laser diodes was achieved by the compact V-shaped external Talbot cavity with volume Bragg grating feedback.

Authors:
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Engineering Science Advanced Research. Computational Sciences and Engineering Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Mechanical, Aerospace, and Biomedical Engineering
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE; ORNL Laboratory Directed Research and Development (LDRD) Program; Office of Naval Research (ONR) (United States)
OSTI Identifier:
1424490
Alternate Identifier(s):
OSTI ID: 1548729
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Optics Communications
Additional Journal Information:
Journal Volume: 414; Journal ID: ISSN 0030-4018
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 42 ENGINEERING; diode laser arrays; laser beam combining; laser beam shaping; laser resonators

Citation Formats

Liu, Bo, and Braiman, Yehuda. Coherent addition of high power broad-area laser diodes with a compact VBG V-shaped external Talbot cavity. United States: N. p., 2018. Web. doi:10.1016/j.optcom.2018.01.021.
Liu, Bo, & Braiman, Yehuda. Coherent addition of high power broad-area laser diodes with a compact VBG V-shaped external Talbot cavity. United States. doi:10.1016/j.optcom.2018.01.021.
Liu, Bo, and Braiman, Yehuda. Tue . "Coherent addition of high power broad-area laser diodes with a compact VBG V-shaped external Talbot cavity". United States. doi:10.1016/j.optcom.2018.01.021. https://www.osti.gov/servlets/purl/1424490.
@article{osti_1424490,
title = {Coherent addition of high power broad-area laser diodes with a compact VBG V-shaped external Talbot cavity},
author = {Liu, Bo and Braiman, Yehuda},
abstractNote = {In this paper, we introduced a compact V-shaped external Talbot cavity for phase locking of high power broad-area laser diodes. The length of compact cavity is ~25 mm. Near diffraction-limit coherent addition of 10 broad-area laser diodes indicated that high quality phase locking was achieved. We measured the near-field emission mode of each individual broad-area laser diode with different feedback, such as a volume Bragg grating and a high reflection mirror. Finally, we found out that the best result of phase locking broad-area laser diodes was achieved by the compact V-shaped external Talbot cavity with volume Bragg grating feedback.},
doi = {10.1016/j.optcom.2018.01.021},
journal = {Optics Communications},
number = ,
volume = 414,
place = {United States},
year = {2018},
month = {2}
}

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Free Publicly Available Full Text
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Cited by: 1 work
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Figures / Tables:

Fig. 1 Fig. 1: (Color online) Experimental setup of a compact V-shaped external Talbot cavity for a BALD array. The compact V-shaped external Talbot cavity diode laser is composed of an array of 10 BALDs, a fast-axis collimator (FAC) and a volume Bragg grating (VBG), where the BALD array is a linearmore » array of 10 BALDs with emitter width 100 µm and an array pitch 200 µm, the fast-axis collimator with 0.8 NA and 0.91 mm focal length, VBG has a diffraction efficiency 90% at 807.9 nm. θ (~3.4 degree) is the off-axis feedback angle (the angle is drawn in exaggeratedly for clear purpose).« less

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