Step  : Use below code in your LoginController.php

use Illuminate\Support\Facades\Session;
use Illuminate\Support\Facades\URL;

public function __construct()
{
 $this->middleware('guest')->except('logout');
 Session::put('backUrl', URL::previous());
}

public function redirectTo()
{
  return Session::get('backUrl') ? Session::get('backUrl') : $this->redirectTo;
}