Optical Storage Laser Synchronization via Feedback Control
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Solution Overview
Problem
Conventional apparatuses using continuous-wave lasers struggle to synchronize internal components with the timing of pulsed lasers, especially when recording information in optical storage media with two-photon absorption compounds, leading to difficulties in controlling the pulsing of pulsed laser beams.
Innovation Solution
An apparatus is designed with a controller that generates a synchronizing signal based on the detection of a split pulsed laser beam, synchronizing the system clock with the timing of the pulsed laser beam, and includes a shutter driver to control the shutter operation in sync with this signal, ensuring precise synchronization of the pulsed laser beam's timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a pulsed laser is used to record information in optical storage medium, then the peak power is sufficient to induce two-photon absorption reaction, but the timing control of the laser beam becomes difficult
Solution Approach 1:
A feedback mechanism is implemented where a synchronizing signal from the pulsed laser beam is detected by a photosensor, processed by a timing controller, and used to control the shutter opening/closing timing. This closed-loop feedback system automatically adjusts the timing control based on the actual laser beam pulsing, resolving the timing control difficulty while maintaining high peak power for two-photon absorption.
2Extent of automation
If a conventional synchronizing signal generated independently of the pulsed laser is used, then the internal components can be synchronized, but the synchronization precision with the pulsed laser timing is insufficient
Solution Approach 1:
The synchronizing signal serves as an intermediary that directly links the pulsed laser beam timing to the shutter control system. Instead of using an independently generated synchronizing signal, the system uses the laser beam's own timing signal (detected by photosensor) as the intermediary to coordinate all internal components, achieving precise synchronization with the actual laser pulsing timing.
3Ease of operation
If the shutter operation is not synchronized with the pulsed laser beam timing, then the system operation is simpler, but the recording quality deteriorates
Solution Approach 1:
The timing controller receives feedback from the photosensor that detects the pulsed laser beam timing, and automatically adjusts the shutter driver control signals to synchronize shutter operation with laser beam pulsing. This feedback-based automatic synchronization maintains simple system operation while achieving precise recording quality through accurate timing coordination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for improved quality recording by synchronizing the optical system's components with the pulsed laser beam's timing, enhancing the accuracy of recording operations and adjusting the recording position precisely.
Implementation Method 1
The two-photon absorption compound is a compound which absorbs light with electrons excited therein only when two photons simultaneously strike the compound
Implementation Method 2
the pulsed laser can produce a laser beam having a peak power sufficient to induce two-photon absorption reaction even when it operates at a relatively low average power
Implementation Method 3
a beam splitter configured to split the pulsed laser beam generated by the laser light source into first and second pulsed laser beams
Implementation Method 4
a beam-condensing optical system configured to concentrate the first pulsed laser beam in the optical storage medium supported by the medium support part
Implementation Method 5
a shutter configured to interrupt and resume emission of the first pulsed laser beam
Implementation Method 6
a photosensor configured to receive the second pulsed laser beam to produce a detection signal
Data Source
AI summary
To record information in an optical storage medium, a pulsed laser beam produced by a laser light source is split into first and second pulsed laser beams by a beam splitter. The first pulsed laser beam to be concentrated in the optical storage medium supported by a medium support part is interrupted and resumed by a shutter. The second pulsed laser beam is received by a photosensor which produces a detection signal. A controller includes a sync-generator configured to receive the detection signal from the photosensor and to generate a synchronizing signal based upon the received detection signal, and a shutter driver configured to drive the shutter in synchronization with timing represented by the synchronizing signal generated by the sync-generator.