You asked about the best way to ask. So, I know that is your intention. You just don't know how to ask. Here is one possible way.
You can start by telling whoever it is that would be in charge of giving you the raise "I have a challenge in my life that I am trying to solve. You are the person who could help me with this. Would you be willing to help?" Posing a question like this causes you to appear to be non-intimidating or pushy. If he or she asks what the challenge is before saying "Yes," then you state that it concerns your work at the company. "Would you be willing to help me?" Then you spell out things that you will find in the information below.
From
SoYouWanna ask for a raise? | SoYouWanna.com. It might be worth your time to check out all the information on the site.
6. GO IN AND ASK FOR THE RAISE
Now that your research is done, you should feel capable of handling any outcome with competence and grace. Here are some general tips:
Dress nice, take a shower, brush your teeth, and don't look like a slob (Check out SoYouWanna dress better? (for women), if applicable).
Be prepared when the conversation doesn't follow your script. If you have prepared well, you will have the answer to any objection on the tip of your tongue. If you can steer the conversation, start off by explaining why you feel you deserve a raise.
Bring a copy of your accomplishments to hand to your boss. And emphasize without over-elaborating - boring the boss is not in your best interest either.
Let your boss bring up what the company has to offer first (that way, if it exceeds your expectations you have not shot yourself in the foot by going first). But you can bring up the compensation issue by noting how much others in the field are paid. Again, do not compare yourself to co-workers. Just the field in general.
When it comes to negotiating, ask for more than you really want, but don't ask for ridiculous amounts. Security will remove you from the premises. Ask for a couple percent more of an increase than you are really expecting, and see what happens.
This is when your role-playing comes in handy and you can counter every reason for why the company shouldn't or can't oblige you. If luck is with you, your boss will be so impressed by your linguistic ability that he/she will crack like an egg and fork over the cash. Even if the answer is still no, think of this as the beginning of a conversation and schedule a time to revisit the topic once you have met some more milestones.