An example method that gets subscribed to the OnLaserHitTriggered event. This is attached to an entity, and when the laser raycast hits the entity, damage is dealt to it.

ExampleLaserHit.cs

private void OnLaserHitTriggered(RaycastHit2D hitInfo)
{
    if (hitInfo.collider.gameObject == gameObject)
    {
        if (bloodParticleSystem != null)
        {
            bloodParticleSystem.Play();
            HealthPoints --;
        }
    }
}