How to collimate a DPSS-Laser (green)

hi,

i have builded a simple, small DPSS-Laser

700mW 808nm IR-Diode -> ND:YVO4 -> KTP -> IR-Filter

Now, i try to collimate the green laser.
on a simple laserpointer, there is a acrylic expanding lens, and than a collimation lens.
Where can i get a expanding lens (glass) ?

Greetings

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