BE36 pilot reported electrical failure in flight. Pilot diverted and landed safely

Narrative

The flight departed ZZZ at approximately XA20 local time under VMC with an IFR clearance to ZZZ1 via the ZZZZZ departure; departure frequency XXX.X. Pre-flight and run-up checks were normal.After takeoff from ZZZ; ATC instructed a left turn to heading 050° and climb to 2;000 feet. We were advised of nearby traffic (Piper Archer) and reported it in sight; maintaining visual separation. ATC then instructed a turn to heading 090° and climb to 5;000 feet. Immediately after that; the Primary Flight Display (PFD) failed; followed immediately by complete electrical failure; including loss of radios and G750/G650 GPS. Standby instruments remained functional.We retrieved my personal handheld radio from flight bag and reestablished communication with ATC to report the urgent situation and informed them about the electrical failure.Given proximity and favorable conditions; we diverted to ZZZ2. We had the airport in sight; and in coordination with ATC; completed the manual landing gear extension procedure as outlined in the POH. Tower personnel confirmed the gear appeared down during a flyover.We entered the traffic pattern and were cleared to land on Runway XX with winds 180° at 8 knots; gusting to 14 knots. Landing was uneventful. We exited via taxiway 1 and held position for inspection by airport fire services. No damage was found to the aircraft; runway; or taxiway.Probable Cause: Complete electrical system failure shortly after takeoff most likely due to the high load that raising the landing gear puts on the battery and alternator. It was later confirmed that the alternator failed completely. At the time of the failure it was 2 years and 2 months old. Preventive Action: Electrical Monitoring & Callouts.I will add a standardized 'post-takeoff electrical check' (ammeter/voltmeter and alternator annunciator) to my climb checklist with verbal callouts to ensure early detection of abnormal bus voltage or charging indications.Backup Comms Readiness.I will incorporate a preflight check of all backup communications equipment--including a quick radio function check--to ensure immediate ATC contact if primary systems fail.Workload Management & Briefing.I will brief and use explicit workload-reduction techniques on departure (e.g.; engage autopilot when appropriate; pre-set frequencies; and bug target altitudes/headings) to preserve capacity for continuous instrument scanning and systems monitoring.