You can try to get a restraining order, you can sue him civilly for damages or you can, as you did, call the police.
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Your best course of action is to immediately file for a civil harassment restraining order to get the neighbor to leave you alone. The forms for such an order and petition are CH-100, CH-110 and they are available online on the California Superior Court webpage. The legal standard that will apply to your case is California Code of Civil Procedure section 527.6(b), which states that "harassment" is unlawful violence, a credible threat of violence, or a knowing and willful course of conduct directed at a specific person that seriously alarms, annoys, or harasses the person, and that serves no legitimate purpose. The burden of proof in meeting this standard is established by presenting “clear and convincing evidence” that your neighbor has caused harassment as defined by law. “‘[C]lear and convincing’ evidence means evidence of such a convincing force that it demonstrates, in contrast to the opposing evidence, a high probability of the truth of the facts for which it is offered as proof. Such evidence requires a higher standard of proof than proof by a preponderance of the evidence.” (BAJI 2.62) Further, “[t]he evidence must be so clear as to leave no substantial doubt. It must be sufficiently strong to command an unhesitating assent of every
reasonable mind.” In re David C. (1984) 152 Cal.App.3d 1189, 1209 (quoting In re Angelia P.(1981) 28 Cal.3d 908, 919); see also Santosky v. Kramer (1982) 455 U.S. 745, 759.
I would strongly encourage you to contact an attorney who can package together a brief that will go with your petition for a restraining order. You can also recover attorney fees against your neighbor if you are deemed the prevailing party by the judge.
It is important that you do this soon, as police may not act very fast and in any civil lawsuit you might bring, your credibility will be enhanced or suffer if you do or do not seek a restraining order as soon as possible.
If you reported this to the police, you should let them handle it.
You could try and get a restraining order of your own against him, but that could be expensive and a restraining order is only a piece of paper when it comes right down to it.
The police can put him in jail.