Help with DC-DC converter.

Hello maybe someone can help me with my problem.
I have a Laser Modul (from a Laserpointer Pen) that run on 1 AAA Battery.
I want to use a 18650 battery to run the Laser.
So my plan was to glued the Laser Modul into this case (https://www.fasttech.com/p/1258801). Along with this Buck Converter (https://www.fasttech.com/p/1219200) to reduce the Voltage to 1,5V, a 18650 battery and a switch. And it would fit!
But the converter specs are wrong. The regulation starts at input Voltage 5,5V and i can not go below 2,55V.
So this converter is useless for this project. Did someone know a way to reduce the voltage to 1,5V?
Something like the Dc-Dc Converter (with regulation) maybe?