Tunable Diode Lasers

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چکیده

At the recent Photonics West and Optical Fiber Conferences, companies presented many new products, ranging from mechanical products to instruments to complex laser systems. As a product engineer, there is nothing quite like the feeling of standing in the booth, talking to potential customers about the product You’ve designed or built. But the real success happens when customers buy the product Customers decide to buy for a number of reasons. The product may let them do something that was difficult or even impossible before. Or the product might make their experiments simpler by creating a betterdesigned or easier-to-use instrument than was previously available. For this to happen, the product must clearly satisfy a real need of the customer, the product should have some sustainable competitive advantage over other companies’ offerings, and the company should be able to make a profit by selling the product. This last item is important since the product can survive only if it can be justified economically both to the customer and the manufacturer. The tunable diode laser is a product that has satisfied all of the above requirements to become a successful product. Since the first commercial introduction of this type of laser about five years ago, it has found numerous applications, ranging from telecommunications to spectroscopy to metrology. While each of these applications places slightly different requirements on the laser and the user interface, each of them requires a narrow-linewidth, continuously tunable, reliable source. (As examples, Figures 1 and 2 depict two somewhat different system that will be described in greater detail in upcoming sections.) The technical capabilities and features of the tunable diode laser played a major role in the success of the product. But the ease-of use of the product also contributed to its success. For example, a room-temperature, 2μm tunable diode laser was recently used by researchers at Stanford University and Focused Research to obtain a survey spectrum of CO2 in a matter of minutes. With this type of technology these researchers can imagine a very sensitive diode-laser-based sensor for combustion monitoring.

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