[Bacardi]

Try different beam materials...

or quick try this. Haven't tested now because using another computer

Spoiler

PHP Code:

#include <sdktools>
new mdlindx;

public OnPluginStart()
{
    RegAdminCmd("sm_beam", beam, ADMFLAG_GENERIC);
}

public OnMapStart()
{
    mdlindx = PrecacheModel("materials/sprites/purplelaser1.vmt");
}

public Action:beam(client, args)
{
    new target;

    if((target = GetClientAimTarget(client, false)) > 0) // && target <= MaxClients)
    {
        new colour[4];
        colour[0] = 255;
        colour[1] = 0;
        colour[2] = 0;
        colour[3] = 255;

        TE_SetupBeamLaser(    target,        // StartEntity        Entity index from where the beam starts.
                            client,     // EndEntity        Entity index from where the beam ends.
                            mdlindx,    // ModelIndex        Precached model index.
                            0,            // HaloIndex        Precached model index.
                            0,          // StartFrame        Initital frame to render.
                            0,          // FrameRate        Beam frame rate.
                            20.0,        // Life            Time duration of the beam.
                            1.0,        // Width            Initial beam width.
                            1.0,        // EndWidth        Final beam width.
                            0,          // FadeLength        Beam fade time duration.
                            0.0,        // Amplitude        Beam amplitude.
                            colour,     // color            Color array (r, g, b, a).
                            0);         // Speed            Speed of the beam.
        TE_SendToAll(0.5);
    }
    return Plugin_Handled;
} 


Just aim someone human player and use command sm_beam

Have read that it could make beam but you see it from up to down or vice versa.
But not show better from sides... Assuming now.