By Terry W. McDaniel, Randall Victora
''This guide is extremely advised for a person with at the very least an energetic curiosity within the box ...'' - RIC News.
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Extra info for Handbook of Magento-Optical Data Recording. Materials, Subsystems, Techniques
Provides detail on the experimental setup. 29 Conventional 28 27 - . ’ %. ) 25 - . a* 24 23 2221 20 199 n=lOO 1 26 Q1 LPE Growth D Qe 0 = 0’ *a, -. g n o 0 ‘Bet 3 O& = . :*‘I. a l a... ) New MOCVD Growth n=lOO 0 *ea i&,~~ a 8Iti 0 25 24 23 22 21 20199 I IU I 11 I Ii? ) Figure 8. Beam divergence angle distributions are shown for devices similar to the structure in Fig. ) Heads and Lasers 47 scanningslit Seam Profiler 7-----q Photodetector Figure 9. A simple setup to measure laser diode astigmatism is shown.
Even in a well-designed MO head, these laser fluctuations can be the limiting tactor on system perSormance. At read powers in the MO head design, the laser diode is only about 10% above threshold (l-3 mw). At these low powers, an index-guided laser is typically multimode, with typical wavelength spreads on the order of a nanometer. As the device is switched to a write or erase power, the laser moves to longer wavelengths with fewer participating modes, as shown in Fig. 4. The randomness associated with this wavelength change is shown in Fig.
For an isolated laser with no optical feedback (OFB), the intensity noise can be quite low even at low powers and decreases further at higher powers. Figure 14 shows the RlN of an isolated laser vs power. At read power in the MO head, the laser power is on the order of l-3 mW. For isolated lasers, typical RIN values at read powers are -120 to -130 dB/Hz. When the laser is powered by a constant current, the laser noise is typically white (no frequency dependence) at frequencies in the range of interest for readback (OS-10 MHz).