A police community support officer groomed a 14-year-old schoolgirl by begging her to send him explicit pictures.
Liam Austerfield, 28, exchanged more than 300 messages with the teenager by text and on Facebook.
During one exchange he sent an indecent picture of himself and told her: "If you want to see more you have to show more."
At Sheffield Crown Court, Austerfield, 28, was jailed for 15 months after he admitted three counts of making indecent images of children, one count of possessing 13 indecent images of a child and one count of inciting a child to engage in sexual activity.
Austerfield was serving with the North West neighbourhood policing team in Wakefield, West Yorkshire, at the time of the offences.
He was suspended from duty while an investigation was carried out, prompted by concerns raised by the girl's parents, and he resigned from West Yorkshire Police in April.
The court heard that communication between Austerfield and the girl 'started on innocent terms but after a short period of time it turned to topics of a sexual nature'.
Michael Rawlinson, prosecuting, said: "He requested naked images of her but the girl didn't send naked images despite his requests.
"She sent pictures of herself in her pyjamas and her bra and knickers instead.
"He knew full well how old this complainant was."
Jailing Austerfield, Judge Roger Keen QC said: "Instead of behaving properly, you abused the trust the community placed in you in order to gain sexual satisfaction.
"You have brought a great deal of distress to your own family but more importantly your actions have had a profound effect on your victim and her family.
"Your position is further aggravated because of your work at the time.
"You corrupted this girl and as a consequence her life has been greatly affected. Your position in the community takes this well outside the appropriate guidelines."
Describing the victim impact statements written by the girl's parents, Mr Rawlinson said: "Her mum feels that the incident has destroyed her family due to the stress of it.
"She has separated from the girl's father following so many arguments and she blames herself for what happened. She feels it has set her daughter back a very great deal."