got the tube today Hwang. the anode end was poking out of the tube, but it seems undamaged. it lights fine, and it does lase, though there is a shadow by the dot on both ends. was it like that before? one side its likely just from the wedge, but the other side has a echo. pretty though. definitely a lighter more pure orange than 612 when its all combined as a single dot.
Yeah I haven't got a grating yet, but got a couple on the way. Using a cd or a prism works nicely though a as well. The lines are close together though so it's hard to spread them without a grating without some effort. As for the shadow it's likely form an internal reflection in the mirror substrate.
Don't know if you got my pm or not but pp for dragon laser sent! Also, my two diodes arrived intact and were great! You are so awesome to do business with!