INDUSTRY BACKGROUND 5 Photonics has taken its place alongside electronics as a critical enabling technology for the twenty-first century. Photonics-based solutions are entrenched in a broad array of industries that include microelectronics, flat panel displays, machine tool, automotive, and medical diagnostics, with adoption continuing in ever more diverse applications. Growth in these applications stems from two sources. First, there are many applications where the laser is displacing conventional technology There are many types of lasers and one way of classifying them is by the material or medium used to create the lasing action. This can be in the form of a gas, liquid, semiconductor, solid state crystal or fiber. Lasers can also be classified by their output wavelength: ultraviolet, visible, infrared or wavelength tunable. We manufacture all of these laser types. There are also many options in terms of pulsed output versus continuous wave, pulse duration, output power, beam dimensions, etc. In fact, each application has its own specific requirements in terms of laser performance. The broad technical depth at Coherent enables us to offer a diverse set of product lines characterized by lasers targeted at growth opportunities and key applications. In all cases, we aim to be the supplier of choice by offering a high-value combination of superior technical performance and high reliability. The word "laser" is an acronym for "light amplification by stimulated emission of radiation." A laser emits an intense coherent beam of light with some unique and highly useful properties. Most importantly, a laser is orders of magnitude brighter than any lamp. As a result of its coherence, the beam can be focused to a very small and intense spot, useful for applications requiring very high power densities including cutting and other materials processing procedures. The laser's high spatial resolution is also useful for microscopic imaging and inspection applications. Laser light can be monochromatic—all of the beam energy is confined to a narrow wavelength band. On November 7, 2016, we completed our acquisition of Rofin Sinar Technologies, Inc. ("Rofin") pursuant to the Merger Agreement dated March 16, 2016. Rofin was one of the world's leading developers and manufacturers of high-performance industrial laser sources and laser-based solutions and components. As a condition of the acquisition, we were required to divest and hold separate Rofin's low power CO$_{2}$ laser business based in Hull, United Kingdom (the "Hull Business"), and reported this business separately as a discontinued operation until its divestiture. We completed the divestiture of the Hull Business on October 11, 2017, after receiving approval for the terms of the sale from the European Commission. On April 27, 2018, we completed the sale of several entities that we acquired in our acquisition of Rofin. See Note 19, "Discontinued Operations and Sale of Assets Held for Sale" in the Notes to Consolidated Financial Statements under Item 15 of this annual report. During fiscal 2018, we made payments on our senior secured term loan facility ("Euro Term Loan") of 141.7 million Euros, including voluntary payments of a total of 135.0 million Euros. On February 6, 2018, our board of directors authorized a stock repurchase program authorizing the Company to repurchase up to $100.0 million of our common stock from time to time through January 31, 2019. During fiscal 2018, we repurchased and retired 574,946 shares of outstanding common stock under this program at an average price of $173.91 per share for a total of $100.0 million, thereby repurchasing the full amount authorized under this program. On March 8, 2018, we acquired privately held O.R. Lasertechnologie GmbH and certain assets of its U.S.-based affiliate (collectively "OR Laser") for approximately $47.4 million, excluding transaction costs. OR Laser produces laser-based material processing equipment for a variety of uses, including additive manufacturing, welding, cladding, marking, engraving and drilling. See Note 4, "Business Combinations" in the Notes to Consolidated Financial Statements under Item 15 of this annual report. On October 5, 2018, we acquired certain assets of Quantum Coating, Inc. ("Quantum") for approximately $7.0 million, excluding transaction costs. See Note 4, "Business Combinations" in the Notes to Consolidated Financial Statements under Item 15 of this annual report. On October 5, 2018, we acquired privately held Ondax, Inc. ("Ondax") for approximately $12.0 million, excluding transaction costs. Ondax develops and produces photonic components which are used on an OEM basis by the laser industry as well as incorporated into its own stabilized lasers and Raman Spectroscopy systems. See Note 4, "Business Combinations" in the Notes to Consolidated Financial Statements under Item 15 of this annual report. On October 28, 2018, our board of directors authorized a stock repurchase program for up to $250.0 million of our common stock through December 31, 2019, with a limit of no more than $75.0 million per quarter. During fiscal 2019, we repurchased and retired 603,828 shares of outstanding common stock under this program at an average price of $128.20 per share for a total of $77.4 million. In November 2018, we borrowed an additional $40.0 million under our revolving credit facility (the "Revolving Credit Facility") and subsequently repaid $30.0 million of these borrowings in July 2019.