Yes, a digital atomic alarm clock can definitely be used as a travel alarm clock. Most digital atomic alarm clocks are compact in size and can easily fit in your luggage or carry-on. They are also reliable and accurate in keeping time, which is important especially when traveling and you need to wake up at a specific time. Additionally, many digital atomic alarm clocks are battery-operated, so you don't have to worry about finding a power outlet while traveling. This makes them a convenient and practical option for those who frequently travel and need a reliable alarm clock.