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Chann B, Goyal AK, Fan TY, Sanchez-Rubio A, Volodin BL, Ban VS. Efficient, high-brightness wavelength-beam-combined commercial off-the-shelf diode stacks achieved by use of a wavelength-chirped volume Bragg grating. Opt Lett 2006; 31:1253-5. [PMID: 16642076 DOI: 10.1364/ol.31.001253] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We report a method of scaling the spatial brightness from commercial off-the-shelf diode laser stacks through wavelength beam combining, by use of a linearly wavelength-chirped volume Bragg grating (VBG). Using a three-bar commercial stack of broad-area lasers and a VBG, we demonstrate 89.5 W cw of beam-combined output with a beam-combining efficiency of 75%. The output beam has a propagation factor M2 approximately 26 on the slow axis and M2 approximately 21 on the fast axis. This corresponds to a brightness of approximately 20 MW/cm2 sr. To our knowledge, this is the highest brightness broad-area diode laser system. We achieve 81% coupling efficiency into a 100 microm, 0.22 N.A. fiber.
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Affiliation(s)
- B Chann
- MIT Lincoln Laboratory, Lexington, Massachusetts 02420, USA.
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Volodin BL, Dolgy SV, Melnik ED, Downs E, Shaw J, Ban VS. Wavelength stabilization and spectrum narrowing of high-power multimode laser diodes and arrays by use of volume Bragg gratings. Opt Lett 2004; 29:1891-1893. [PMID: 15357350 DOI: 10.1364/ol.29.001891] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Spectral line narrowing (by a factor of 8) and stabilization of the emission wavelength (by a factor of 30) of multimode high-power laser diodes and arrays is demonstrated by use of volume Bragg gratings fabricated in high-stability inorganic photorefractive glasses. Applications include stabilization of pump laser diodes and arrays for solid-state lasers and metal-vapor lasers, spin hyperpolarization of noble gases used in medical imaging, and others.
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Affiliation(s)
- B L Volodin
- PD-LD, Inc., 30-B Pennington-Hopewell Road, Pennington, New Jersey 08550, USA.
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Steele DD, Volodin BL, Savina O, Kippelen B, Peyghambarian N, Röckel H, Marder SR. Transillumination imaging through scattering media by use of photorefractive polymers. Opt Lett 1998; 23:153-155. [PMID: 18084443 DOI: 10.1364/ol.23.000153] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We demonstrate the use of a near-infrared-sensitive photorefractive polymer with high efficiency for imaging through scattering media, using an all-optical holographic time gate. Imaging through nine scattering mean free paths is performed at 800nm with a mode-locked continuous-wave Ti:sapphire laser.
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Hendrickx E, Wang JF, Maldonado JL, Volodin BL, Sandalphon, Mash EA, Persoons A, Kippelen B, Peyghambarian N. Synthesis and Characterization of Highly Efficient Photorefractive Polymer Composites with Long Phase Stability. Macromolecules 1998. [DOI: 10.1021/ma9714777] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- E. Hendrickx
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
| | - J. F. Wang
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
| | - J. L. Maldonado
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
| | - B. L. Volodin
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
| | - Sandalphon
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
| | - E. A. Mash
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
| | - A. Persoons
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
| | - B. Kippelen
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
| | - N. Peyghambarian
- The University of Arizona, Optical Sciences Center, Tucson, Arizona 85721 The University of Arizona, Department of Chemistry, Tucson, Arizona 85721
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Kippelen B, Marder SR, Hendrickx E, Maldonado JL, Guillemet G, Volodin BL, Steele DD, Enami Y, Yao YJ, Wang JF, Röckel H, Erskine L, Peyghambarian N. Infrared photorefractive polymers and their applications for imaging. Science 1998; 279:54-7. [PMID: 9417020 DOI: 10.1126/science.279.5347.54] [Citation(s) in RCA: 182] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Photorefractive polymers with high diffraction efficiency in the visible and near-infrared regions of the electromagnetic spectrum have been developed. These polymers, which have a large dynamic range because of their high orientational birefringence, incorporate a dye designed to have a large dipole moment and a high linear polarizability anisotropy. Such polymers have enabled demonstrations of imaging through scattering media, using a holographic time-gating technique at a wavelength that is compatible with the transparency of biological tissues and with the emission of low-cost semiconductor laser diodes.
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Affiliation(s)
- B Kippelen
- Optical Sciences Center, University of Arizona, Tucson, AZ 85721, USA.
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Abstract
We report observation of the photorefractive effect in functionalized polymer-dispersed liquid crystals. The photoconductive properties are provided by the polymer matrix, and the field-dependent refractive-index changes are generated by the dispersed nematic liquid-crystal droplets. A high diffraction efficiency (8%) and a high refractive-index modulation amplitude (Dn = 2 x 10(-3)) are obtained in 53- microm-thick samples with an applied field of 22 V/microm.
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Volodin BL, Kippelen B, Meerholz K, Kukhtarev NV, Caulfield HJ, Peyghambarian N. Non-Bragg orders in dynamic self-diffraction on thick phase gratings in a photorefractive polymer. Opt Lett 1996; 21:519-521. [PMID: 19865458 DOI: 10.1364/ol.21.000519] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We demonstrate that recording thick holographic phase gratings in photorefractive polymers can lead not only to very efficient Bragg diffraction but also to rather strong diffraction into non-Bragg orders. We show that this effect has features drastically different from those of Raman-Nath diffraction on thin gratings. We compare the experimental results with a model based on the theory of dynamic self-diffraction in a photorefractive medium. Applications of this effect in devices for optical image processing are proposed.
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