Groan. Explaining jokes is such a pain. The expression usually means, “Making little of”, or putting down. But since solar sails use light, it’s also a play on words/concepts. Get it yet?
One possiblity is a carbide or graphite composite integrated in the beam exaughst port to give it a sort of heat sink and high density pressure resistance.
From what I know graphite is a material that can withstand extremes in pressure where other materials would incinerate or become liquid. Instead of shattering, incinerating, or melting like most all materials a graphite and carbide could be Incorporated in a organic composite material that can sink the extreme heat and withstand the fluctuating pressure. The next step would be to redirect it.