This is safety glass, but it's very old glass <1994. So probably not the kind that will smash, but kite mark should tell you if it does.
I want to make a new door for my greenhouse out of it if I can, but that of course means cutting it down.
Cut tempered glass with diamond circular saw blade
cuttingglass
Related Solutions
If it is in a frame 1/4" glass will be sufficient. Your options for glass will be tempered glass or laminated glass because of it's proximity to the ground.
Tempered glass will break into very small pieces like a car window for a door. Tempered glass is stronger than normal glass.
Laminated glass will break like a car windshield. It breaks normally but it is two pieces bonded together with a plastic. The plastic prevents most injuries as well as the mess from breaking. Laminated glass is more often used for safety/security applications.
Although 1/4" is suitable for the application, I myself am always weary installing it as an interior partition. My family business has built all glass offices in buildings and we use 3/8" tempered glass. 3/8" Tempered is extremely difficult to break. When you get up to thicknesses that large as far as cost goes the difference between 3/8" and 1/2" thick glass isn't very significant.
If you go with a thicker size be sure that your trim is strong enough to withstand an impact of the weight of the glass, the weight of a person, and the velocity they are traveling. This is due to the fact that it is more likely to break from breaking out of its frame and falling down, especially in wood.
If the beams are not structural I would recommend you use a router to create a slot in each beam deep enough to slide the glass in far enough to place it where it needs to go and then slide it back towards the other beam into the slot you created there. This is commonly done with metal storefronts and is called a flush glaze.
Expanding on my comment: I think that the main problem with the proposed setup is lacking a slide or rail on the bottom. Without a slide on the bottom the glass door can swing perpendicular to the sliding direction. See the below explanation for what I mean.
I have a sliding shower door with a sliding mechanism on the top (a stainless steel rail with 2 wheels per door on top of the rail) and a tiny U channel on the bottom to keep the door from swinging. I know, I need to clean the shower a little...
The door is sliding in the direction of the blue arrows. The U channel on the bottom is keeping the door from swinging in the direction of the red arrows. This U channel is about 2 CM long and seems to be made from aluminium.
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Best Answer
Safety glass is either tempered, laminated (with plastic layers for shard retention), wired with mesh, or a combination. Rarely can any of them be cut without detonation. I would not attempt it without substantial safety gear.