High Frequency Laser Modulation
Solidstate lasers have internal capacitance (typically junction) and on times. Modulating something quickly with an internal capacitance will tend to just result with a smaller amplitude or not coming on at all. I don't know much about the diodes in a DVD drive, I'd guess it depends on the drive, however, there are plenty available online that do switch faster: https://www.arrow.com/en/products/plt5520-b1-2-3/osram-opto-semiconductors?gclid=Cj0KCQjw-Mr0BRDyARIsAKEFbef1wvwnZJ7LD2As3XJQe2lQ_xlWibDgCYdb348_OCXGmHE6qhXRzKYaArtDEALw_wcB

If you don't already know Digikey and Mouser are the big box stores of choice for this sort of thing, but if you need something special and are willing to pay out your nose, thor labs probably has it.