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Hybrid High-Power
Two-Wavelength Laser Diode for DVD x4-Speed
Recording and CD Playback
SLD6361VL
The DVD recording market continues
to evolve even further. Sony developed the two-wavelength
laser diode to support both the CD and DVD formats.
Now, Sony is releasing a new product, the SLD6361VL,
which adopts high-precision hybrid mounting
for a DVD recording laser diode and a CD playback
laser diode to achieve all the advantages of
the two-wavelength laser diode. This is a new
two-wavelength laser diode that inherits the
performance of conventional single-wavelength
laser diodes. |
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SLD6361VL |
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*Two-wavelength (650
and 780 nm) high-power laser diode (high-precision
hybrid mounting)
*DVD: 110 mW maximum (pulse drive) CD: 8 mW
maximum (self-pulsation mode)
* High-temperature operation (70°C) guaranteed |
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Sony has responded
to the needs of the DVD player market with two-wavelength
laser diodes. Now that the market is rapidly
shifting from players to recorders, the two-wavelength
laser diode is evolving the ability to record. |
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Two-Wavelength
(650 and 780 nm) Hybrid Laser Diode |
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The SLD6361VL mounts
a 650 nm band record/playback laser diode and
a 780 nm band playback laser diode at the beam
spacing of 110 µm allowed for optical
aberrations and combines them in a single package.
By using a newly-developed hybrid mounting technology,
Sony was able to control the emitting point
spacing at the ±10 µm level. This
makes it possible, when creating new end products,
to select laser diode products with the most
optimized structure and design from Sony's extensive
product line both for DVD and CD applications.
Hybrid two-wavelength laser diodes have the
following advantages.
* Reductions in both the number of parts in
the optical pickup and the number of assembly
steps.
* Shorter development periods while allowing
optimized design of each of the DVD and CD laser
diodes. |
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110 mW DVD,
8 mW CD |
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This new product uses
the proven x8 recording SLD1234 (140 mW in pulse
drive) as its DVD recording laser diode. In
addition to having the ability to support future
improvements in the SLD6361VL, another advantage
of this hybrid technology is the ability to
quickly design and move to mass products using
future laser diode products that support x12
and x16 speeds. As its CD playback laser diode,
the SLD6361VL includes a low-power self-pulsation
laser diode that has an index-waveguide and
a multiple quantum well structure and can achieve
low noise without high frequency superposing
circuit. |
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High-Temperature
Operation (70°C) Guaranteed |
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The SLD6361VL achieves
operation at 70°C
by mounting together two laser diodes, a proven
self-pulsation type device to which a low threshold/low
operation current structure has been incorporated
in the CD side (780 nm band), and a device that
inherits the basic structure of the SLD1234VL
in the DVD side (650 nm band). The merits of
the hybrid two-wavelength laser diode derive
from this combination, and this technology can
achieve reduced number of parts, more stable
performance, and lower cost in DVD recorder
optical pickups while responding to increasingly
diverse needs without compromise and striving
for improved characteristics. |
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•••• Mr.HANZAWA ••••
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The two requirements
for forming the optical system are that the
laser beam emitting point be narrow and that
the precision be excellent. For assembly, the
chip spacing needs to be wide. We on the development
team worked as a group to overcome these conflicting
design requirements, and succeeded in creating
this new product. DVD speeds are increasing
along with improvements in DVD recording technologies.
I hope to continue to be able to develop, in
the short-run, new high value added easy to
use laser diodes that can respond to these market
needs. |
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See
all articles with figures and tables.  |
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Vol.36 |
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