Angularjs2 Remove the hash fragment from url permanently

I use oauth authentication to login user. after use logined in, get taken from URL. URL like this: http://xxx/callback#access_token=xxx. then redirect to other page. I use this.router.navigateByUrl to redirect, the hash tag is removed. but when i click other link,the hash fragment will show again. how can i remove the hash token fragment permanently?

Example:

after use login in //xxx/callback#access_token=xxx

redirect to //xxx/home

then click linkA, the url is //xxx/linkA#access_token=xxx

expected url is //xxx/linkA

Thanks