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| ML1XX25 series |
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Industry top-level pulse output of 250mW
Ideal for 16x-speed DVD recording |
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Outline |
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The recording velocity for record-type DVD devices continues
to increase. These devices are spreading rapidly as an external memory units for
personal computers, etc. During production was scheduled for DVD record-type
devices corresponding to the maximum DVD record velocity:16x-speed. To record
high volumes of data in a short time on these DVD devices, high output semiconductor
lasers become necessary. Our company has already started mass production of high
red output semiconductor laser ML1XX23 series with optical output of 200mW. To
secure cost reductions in the optical pickup par and a recording margin in the
various DVD±R disks this time, however, we continued to optimize the element
structure and delivered the top level optical output of 250mW for record-type
DVD device applications. |
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Features |
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A low operating current realized by adopting a low loss optical
waveguide structure. (Typical 310mA @Tc= at 25°C, Po= 250mW: pulse) |
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High enough kink characteristics* compatible with optical output
250mW. |
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75°C high temperature actuation. |
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Superb reliability realized by the adoption of the terminal
face window structure**. |
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*Non-linearity in the optical output-current characteristics
of LD. When a kink appears, it restricts the effective maximum optical output. |
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**The LD's optical output terminal face is treated so that
it does not absorb any laser light. It enables high optical output and high reliability,
by avoiding crystal disruption (momentary terminal face disruption phenomenon)
caused by heat produced by the absorption of light in the terminal face. |
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Applications |
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ideal for record-type DVD drives (16x-speed recording). |
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Future deployment |
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While we have realized the highest velocity of 16x speed for
DVD recording, it is believed that 2-layer disks with double the recording capacity
will spread in future. More than double the optical output is required for 2-layer
disks, compared to single layer disks. In order to launch it on the market quickly,
we are proceeding to develop as the next model a 300mW class, optical output product
suitable for 8x-speed 2-layer disk recording. |
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