In many countries legal separation is a legal step married couples can take towards divorce. In many cases the couple is only considered legally separated if a court has recognized their separation. However, even with a legal separation, couples may choose to remain married.
Some countries and some states within the United States require a period of legal separation before a a couple can divorce. Laws vary from state to state and from country to country.
Alaska has an online self help center.
The state of Alaska has a pretty nice help center with lots of useful information.
Here is the link to the main page:
http://www.alaska.gov/courts/selfhelp.htm
Here is the link to the page on legal separation:
http://www.alaska.gov/courts/shclegsep.htm
According to the page "There are no court forms for legal separation."
This page has the laws regarding legal separation in Alaska:
http://www.alaska.gov/courts/shclaws.htm#2524400