Carrot Bisque

6 cups chicken stock
5 slices bacon, chopped
1 1/2 pounds carrots, coarse chopped
1/2 cup green onions with tops, chopped
1/2 pound fresh mushrooms, chopped
1 cup celery with leaves, chopped
1/8 teaspoon dry thyme
1 bay leaf
1 cup half-and-half

Saut