He's retired now but i think he used to use a Carlton Airblade 2000 at that time. In the WC97 he didn't have a contract with Carlton so he used an Yonex Isometric 300 tour.
Before he just quit the international circuit, he used a yonex cab 21 with carlton logo on the strings.
Yes, from some photos provided by the www.badmintonphoto.com we can see Rasmussen is using Cab 21 with Carlton logo on the string. Apart from Zhao Jian Hua, Rasmussen is the second left-handed player I admired much. He is aggressive, having powerful and accurate smashes in different direction, his footwork is very good too. It is really a bad news that he has retired. Anyway, I have ever seen Rasmussen using a Carlton Rasmussen Tour during his practice, so Carlton Rasmussen series badminton rackets should be collectible items for those Rasmussen fans, with no exception of me.