Novel circular-beam equalizing techniques that use graded-index fiber optics for a high-power laser diode
Applied Optics, Vol. 41, Issue 33, pp. 7025-7030 (2002)
http://dx.doi.org/10.1364/AO.41.007025
Acrobat PDF (768 KB)
Abstract
We demonstrate a novel method of equalizing a laser diode (LD) beam into a circular beam. This method uses the twist effect of graded index (GI) fiber optics. An asymmetric LD beam with beam qualities of M2 = 500 in the slow axis and M2 = 4 in the fast axis is converted successfully into a symmetric circular beam with a beam quality of M2 = 175. The circular-output beam with 92% coupling efficiency from the fiber input to the fiber output is obtained with a 5-m-long GI1200 (1200 means a core diameter of 1200 μm) fiber for a 2-W LD array. We extend the experiments to a higher-power source with higher asymmetric beam qualities of M2 = 3000 and M2 = 4. By slightly bending the GI10000 (10000 means a core diameter of 10,000 μm) fiber, we have succeeded in generating a symmetric beam with a improved beam quality of M2 = 2000. The average beam quality is preserved when the asymmetric ratio is not high, and the beam quality degradation ratio is investigated up to asymmetric ratios of 750.
© 2002 Optical Society of America
[Optical Society of America ]
OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2310) Fiber optics and optical communications : Fiber optics
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.2010) Lasers and laser optics : Diode laser arrays
(140.3300) Lasers and laser optics : Laser beam shaping
Citation
Yushi Takenaka, Lalit B. Sharma, Keisuke Furuta, Tetsuo Kojima, and Koji Yasui, "Novel circular-beam equalizing techniques that use graded-index fiber optics for a high-power laser diode," Appl. Opt. 41, 7025-7030 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-33-7025
You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
Related Journal Articles 
- Shaping of the End of a Multimode Optical Fiber for Efficient Coupling Light from a Laser Diode (AO)
- Modal Field Deformation and Transition Losses in UV Side-Written Optical Fibers (AO)
- π-shifted Sagnac interferometer for characterization of femtosecond first- and second-order polarization mode dispersion (OL)
- Dependence of Bending Losses on Cladding Thickness in Plastic Optical Fibers (AO)
- Combined effects of bending and elongation on polymer optical fiber losses (OL)
Related Conference Papers
- Spectral Beam Combining of a 980-nm Laser Array for EDFA Pumping
- A 20kW Peak Power, Air-Core, Ultrashort Pulse Fibre Source with Extensive Wavelength Conversion
- 1.3-μm Pulsed Fiber Lasers Mode-Locked by Purified Carbon Nanotubes
- Femtosecond pulse compression in air-guiding PCF
- High-Brightness Wavelength-Beam-Combined Diode Laser Stacks Using a Volume Bragg Grating (VBG)
« Previous Article | Next Article »
OSA is a member of 