A case has been registered against the accused and police are conducting interrogation.
The incident came to light yesterday when the victim filed a police complaint against the doctor, who lived as a tenant on the ground floor of her house.
"The victim in her complaint said that she was alone at her home yesterday when the accused forcibly entered her room and allegedly raped her.
"He also threatened the victim of dire consequences if she reported the matter to police," said the police officer investigating the case.
The victim's husband was BSF jawan who died few years ago while on duty.
On account of her husband's death, the government had given her compensation, investing which she bought a house in Mehrauli.