Investor Presentaiton

No Offer or Solicitation This document shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which the offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended. Additional Information and Where to Find It This communication does not constitute an offer to buy or solicitation of an offer to sell any securities. This communication relates to a proposal that II-VI has made for a business combination transaction with Coherent. In furtherance of this proposal and subject to future developments, II-VI and Coherent may file one or more registration statements, proxy statements, tender offer statements or other documents with the SEC. This communication is not a substitute for any proxy statement, registration statement, tender offer statement, prospectus or other document II-VI and/or Coherent may file with the SEC in connection with the Transaction. INVESTORS AND SECURITY HOLDERS OF II-VI AND COHERENT ARE URGED TO READ THE PROXY STATEMENT(S), REGISTRATION STATEMENT, TENDER OFFER STATEMENT, PROSPECTUS AND/OR OTHER DOCUMENTS FILED WITH THE SEC CAREFULLY IN THEIR ENTIRETY IF AND WHEN THEY BECOME AVAILABLE AS THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE TRANSACTION. Any definitive proxy statement(s) or prospectus(es) (if and when available) will be mailed to stockholders of II-VI and/or Coherent, as applicable. Investors and security holders will be able to obtain free copies of these documents (if and when available) and other documents filed with the SEC by II-VI through the web site maintained by the SEC at www.sec.gov, a , and by visiting II-VI's investor relations site at https://ii-vi.com/investor-relations/. Participants in the Solicitation This communication is neither a solicitation of a proxy nor a substitute for any proxy statement or other filings that may be made with the SEC. Nonetheless, II-VI and its directors and executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies in respect of the Transaction. You can find information about II-VI's executive officers and directors in II-VI's proxy statement for its 2020 annual meeting, which was filed with the SEC on September 29, 2020 and in II- VI's Annual Report on Form 10-K for the fiscal year ended June 30, 2020, which was filed with the SEC on August 26, 2020. Additional information regarding the interests of such potential participants will be included in one or more registration statements, proxy statements, tender offer statements or other documents filed with the SEC if and when they become available. These documents (if and when available) may be obtained free of charge from the SEC's website www.sec.gov, and by visiting II-VI's investor relations site at https://ii-vi.com/investor-relations/. IIVI II-VI Incorporated - Export Control Classification EAR99 Page 3

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